Wyniki wyszukiwania - BazTech

1

Conformal thermostating of high-pressure die castings with the increased tightness

Figurski Krzysztof, Pasierb Łukasz, Piekło Jarosław, Burbelko Andriy

Polish Technical Review

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2024

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No. 1

2--7

EN

In the paper, the exemplary concept, together with the analysis of the obtained results from the experimental trials of thermostating using the conformal system in the cold-chamber high-pressure die casting process of aluminium alloy, was described. Construction of the experimental system of thermostating channels, mapping the surface of the cavity, as being placed in the core, shaping the internal geometry of casting with a required increased tightness was performed. The results of the numerical simulations for a given case and the results of the experiments and RTG examinations of the castings made on a real system, utilizing the designed cores, performed in increment technology from steel 1.2709 were submitted.

PL

W pracy przedstawiono przykładową koncepcję wraz z analizą otrzymanych wyników z prób eksperymentalnych dla konformalnego układu termostatowania odlewniczej formy wysokociśnieniowej do odlewania zimnokomorowego stopów aluminium. Dokonano konstrukcji doświadczalnego układu kanałów termostatujących odwzorowujących powierzchnię wnęki formy, umieszczonych w rdzeniu kształtującym wewnętrzną geometrię odlewu o wymaganej podwyższonej szczelności, przedstawiono wyniki symulacji numerycznych dla zadanego przypadku oraz wyniki doświadczeń oraz badań RTG odlewów wykonanych na rzeczywistym układzie wykorzystującym zaprojektowane rdzenie wykonane w technologii przyrostowej z stali 1.2709.

2

Effect of Cavitation Phenomenon on the Quality of High-Pressure Aluminium Alloy Castings

Brzeziński Marcin, Wiśniowski Jakub

Journal of Casting & Materials Engineering

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2023

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Vol. 7, no. 3

27--30

EN

This article presents an analysis of the effect of cavitation on the erosion of pressure moulds intended for the HPDC casting mould manufacturing process. Changes in the surface area of the eroded areas were investigated via photographs of castings at the beginning of the mould life as well as at 30%. The individual process variables were described and their influence verified via the cavitation potential module of the Flow3D simulation programme. The results are presented graphically with a description of the relationships and observations. The summary provides an explanation of the results and the dependencies that occurred.

3

Experimental investigations of microstructural and mechanical behaviour of aluminium alloy 7075 hybrid nanocomposites

Kishore K.L., Padal Balaram K.T., Ranga Raju D.

Composites Theory and Practice

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2023

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R. 23, nr 4

226--234

EN

In this paper, the microstructural and mechanical characterisation of hybrid composites with a metal matrix was conducted. Al2O3 nanoparticles and CNTs were added to strengthen an aluminium alloy (AA 7075) using solid-state powder metallurgy. Utilizing XRD analysis and scanning electron microscope (SEM), microstructural characterization was carried out. Uniaxial compression and microhardness testing were performed to determine how the hybrid composites behaved mechanically. The microstructural research revealed that the nanoparticle dispersion in the matrix is uniform. The XRD plots and the Williamson-Hall equation were used to evaluate the crystallite size, lattice strain and dislocation density. In comparison to the base alloy, the composites have better strength and micro hardness.

4

Influence of tool pin profile and welding parameters on microstructure and mechanical properties of dissimilar friction stir welded AA2024 to AA7075 alloys

Mohammed H. B., Naemah I. M., Jomah A. J. S., Alrubaiy A. A. A. G.

Archives of Materials Science and Engineering

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2023

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Vol. 124, nr 1

14--24

EN

Purpose: The paper aims to produce aluminium welds in the solid state with good specifications and the least amount of welding defects by using the friction stir welding method (FSW) and different tool pin profiles and welding parameters. The research investigated the mechanical characteristics and microstructure of a friction stir welded dissimilar aluminium alloy (2024-T3 to 7075-0) through thickness produced by varying welding settings and three different FSW tool pin shapes. Design/methodology/approach: The objective is to obtain the welds with the least amount of welding defects in the solid state by using the friction stir welding method (FSW), designing the tool pin profiles, and changing the rotation speeds. Findings: According to tensile strength and micro-hardness tests, tool rotation of 2000 rpm and square pin profile were the best compared to other working parameters. The greatest hardness and highest tensile strength of FSWed dissimilar aluminium joints have been 144 HV and 215 MPa, respectively, when using the square pin profile at a tool rotation speed of 2000 rpm. The hardness and tensile strength of FSWed dissimilar aluminium alloy joints increase with the tool rotation speed. Microstructural observations of the FSWed dissimilar aluminium joints using a square pin profile at the tool rotation speed of 2000 rpm exhibited the weld zone's high weld quality. Additionally, there were no defects in the weld zone. The fracture surface of the FSWed joint indicated a ductile fracture type. Research limitations/implications: With many regions on either side of the weld with varied compositions, microstructures, and characteristics, the resulting welds of dissimilar alloys might result in unsatisfactory weld joints. Practical implications: The weld zone's exceptional weld quality was demonstrated by microstructural investigations of the FSWed dissimilar aluminium connections utilising a square pin profile at a tool rotation speed of 2000 rpm and feed rate of 20 mm per minute. Application in aerospace, shipbuilding and marine, railway, construction, electrical industries, and land transportation. Originality/value: The original value of the paper is the production of welds from dissimilar aluminium alloy (2024-T3 to 7075-0) with the least amount of welding defects by changing the tool pin profiles and tool rotation speeds using the friction stir welding method.

5

Electrochemical corrosion of aluminium alloy AA1050, processed by accumulative roll bonding

Ilieva M. D., Radev R. H.

Archives of Materials Science and Engineering

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2023

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Vol. 124, nr 1

5--13

EN

Purpose: To investigate the changes in corrosion behaviour of severely deformed by accumulative roll bonding aluminium alloy AA1050. Design/methodology/approach: To determine the influence of the accumulative roll bonding on microstructure, texture, and grain size, electron backscattered diffraction was used. Corrosion behaviour was evaluated in a 3.5 wt.% sodium chloride water solution using anodic polarisation. Findings: It was found out that accumulative roll bonding up to eight cycles led to an increase in corrosion rate compared to annealed alloy, but the increase in the number of cycles of accumulative roll bonding from two to eight shows a tendency toward lowering corrosion rates. It has a beneficial influence on pitting corrosion susceptibility. Research limitations/implications: The presented research focuses only on the influence of texture and grain size on severely deformed aluminium alloy AA1050 corrosion. Other factors, such as accumulated during deformation stresses, could also play their role in the corrosion process. Originality/value: The paper reports results on the influence of two factors – texture and grain size, on the corrosion of severely deformed aluminium alloy AA1050. Most reports on the topic include only the influence of texture or grain size.

6

Zastosowanie zgrzewania tarciowego z przemieszaniem (FSW) do wykonywania połączeń doczołowych wysokowytrzymałych stopów aluminium stosowanych w przemyśle zbrojeniowym

Kosturek Robert

Stal, Metale & Nowe Technologie

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2022

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nr 9-10

38--41

PL

Otrzymywanie wysokiej jakości połączeń spójnościowych umacnianych wydzieleniowo stopów aluminium stanowi jedną z decydujących batalii na froncie rozwoju współczesnej techniki, będąc istotnym motorem postępu przemysłu motoryzacyjnego, lotniczego i zbrojeniowego.

EN

This paper presents selected results of research concerning AA2519-T62 and AA7075-T651 butt joints produced with the FSW technique, including macroscopic observations, microhardness distributions and tensile tests. The applied welding technique enabled obtaining high-quality welds of the 87% and 77% joint efficiencies for AA2519-T62 and AA7075- -T651 respectively.

7

Adjustment of process parameters in the brazing of aluminium heat exchangers

Mirski Zbigniew, Pabian Jarosław

Biuletyn Instytutu Spawalnictwa w Gliwicach

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2022

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Vol. 66, No. 4

9--20

EN

Brazing in tunnel continuous furnaces constitutes the primary technology used when brazing heat exchangers made of the 3XXX series of aluminium alloys. The pure nitrogen-shielded brazing process is performed using non-corrosive flux NOCOLOK. The primary parameters applied during the brazing of aluminium heat exchangers include brazing temperature and time as well as the type and the amount of filler metals. One of the most commonly used brazing metals (having the form of coatings deposited on elements subjected to brazing) is silumin AlSi7.5. All parameters, significantly affecting the quality of the brazing process, enable the prevention of unfavourable physicochemical phenomena such as the dissolution and the erosion of brazed joints. The article presents results of brazing tests performed using normal, hot and very hot temperature profiles. A wedge test discussed in the article (performed using the normal brazing profile and involving metallographic examination) enabled the determination of the capillarity and wettability of the filler metal. The test also revealed the slight dissolution of materials subjected to brazing, yet within acceptable limit values.

PL

Lutowanie twarde w tunelowych piecach przelotowych jest podstawową technologią spajania wymienników ciepła, wytwarzanych ze stopów aluminium serii 3XXX. Lutowanie odbywa się pod osłoną czystego azotu (99,999%) oraz przy oddziaływaniu niekorozyjnego topnika NOCOLOK. Do podstawowych parametrów lutowania aluminiowych wymienników ciepła zalicza się temperaturę i czas lutowania oraz rodzaj i ilość (grubość plateru) stosowanych materiałów dodatkowych. Jako luty, w postaci platerów naniesionych na łączone elementy, są najczęściej używane spoiwa siluminowe, w tym przede wszystkim spoiwo AlSi7,5. Wszystkie parametry mają bardzo istotny wpływ na jakość procesu lutowania, w tym na uniknięcie niekorzystnych zjawisk fizykochemicznych, takich jak roztwarzanie i erozja połączeń lutowanych. W artykule przedstawiono wyniki prób lutowania, stosując profile temperaturowe: normalny, gorący i bardzo gorący. W próbie klinowej, używając normalnego profilu lutowania, na podstawie badań metalograficznych, określono kapilarność i zwilżalność lutu, a także stwierdzono nieznaczne roztwarzanie materiałów lutowanych, w granicach wartości dopuszczalnych.

8

Effect of Tool Pin Profile on Friction Stir Welding of Dissimilar Materials AA5083 and AA7075 Aluminium Alloy

Azmi Muhammad Haziq, Hasnol Muhammed Zakariya, Zaharuddin Mohd Faridh Ahmad, Sharif Safian, Rhee Sehun

Archives of Metallurgy and Materials

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2022

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Vol. 67, iss. 2

465--470

EN

Friction stir welding (FSW) currently contributes a significant joining process for welding aluminium, magnesium, and other metals in which no molten or liquid state were involved. It is well known that aluminium alloys are more effective, promising for different applications light weight, strength and low cost. This study aims to determine how such tools geometry and tool speed can be related to dissimilar material in the joining process. Specifically, it investigates whether the distribution of the weld zone particularly between tool pin profile to rotational speed. In this context, the influence of tool pin profile and tool rotational speed in relation to the mechanical properties and microstructure of friction stir welded. The aim of this study is also to test the hypothesis that better mixing between dissimilar metals at higher tool rotational speed along the weld path. Three different tool profiles were configured with AA5083 and AA7075. During welding, notable presence of various types of defects such as voids and wormholes in the weld region. The results of this work showed that the tool pin profile and weld parameter are significant in determining mechanical properties at different tool rotational speed. The highest tensile strength achieved was about 263 MPa and the defectfree joint was obtained by using the threaded tapered cylindrical pin tool at a rotational speed of 800 rpm. These findings indicate that different tool profiles influence differently on the formation of defects at welds. On this basis, the tool geometry should be considered when designing experimental friction stir welded joint.

9

Correlation between Microstructure and Electrochemical Properties of Al-Si Alloys

Minciuna Mirabela G., Vizureanu Petrica, Jeż Bartłomiej, Sandu Andrei Victor, Nabiałek Marcin, Achitei Dragos C.

Archives of Metallurgy and Materials

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2022

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Vol. 67, iss. 3

1067--1070

EN

The composition and structural modification of aluminium alloys influence their strength, tribological properties and structural stability. The phase composition of the structure as well as the characteristics of the elementary cell of each identified phase was established by X-ray diffraction, and the main objective was to determine the compositional phases, microstructure and microcomposition of the alloy. Based on the cyclic voltammograms it can be said that on the OCP interval (+1.5 V… -1.1 V), after the breakthrough potential is an intensification of the anodic process by the pronounced increase of the current density, in these conditions the Al-Si alloy has low values which means that it has a better corrosion resistance.

10

Effect of Filter Type on Mechanical Properties During Aluminium Alloy Casting

Bruna Marek, Galčík Marek

Archives of Foundry Engineering

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2022

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Vol. 22, iss. 3

95--98

EN

The naturally pressurized gating system was used for reoxidation suppression during aluminium alloy casting. A naturally pressurized gating system appears to be a suitable solution to reduce reoxidation processes, which was proven by our previous works. The disadvantage of this system is that without inserting deceleration elements, the melt velocity is supercritical. Therefore, the aim of paper is to find a proper way to reduce the melt velocity, which is the main parameter affecting the scale of reoxidation processes. For the purpose of the melt velocity reduction, labyrinth filters, foam filters and flat filters effect on the melt velocity and the number of oxides were investigated by numerical simulation software in the first stage of the experiment. After simulations observation, the effect of filters on the mechanical properties was investigated by experimental casts. The simulations and experimental casts proved that filters had a positive effect on the melt velocity reduction and it was associated with increased mechanical properties of castings. The best results were achieved by the foam filter.

11

Prediction of filler added friction stir welding parameters for improving corrosion resistance of dissimilar aluminium alloys 5052 and 6082 joints

Sasikumar A., Gopi S., Mohan Dhanesh G.

Advances in Materials Science

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2022

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Vol. 22, nr 3(73)

79--95

EN

The aluminium alloys 5052 and 6082 are extensively used in manufacturing lighter structural members, having improved strength and resistance to corrosion. Magnesium (Mg) and Chromium (Cr) powder were the filler materials selected for enhanced corrosion protection properties in this investigation. Friction stir welding (FSW) process parameters viz., spindle speed, welding speed, shoulder penetration, the centre distance between the holes and filler ratio are used to forecast the minimum corrosion rate from different weld regions of AA5052-AA6082 dissimilar joints. Response surface methodology based on a central composite design was used to evolve the mathematical models and estimate dissimilar FSW joints’ corrosion rates. Response optimization shows that the minimum corrosion rate was achieved by the welding parameters of spindle speed 1000 rev/min, welding speed 125 mm/min, holes spacing of 2 mm and filler ratio 95% of Mg and 5% of Cr.

12

Stopy aluminium na świecie (obróbki skrawaniem)

Pałka Tomasz

Stal, Metale & Nowe Technologie

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2021

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nr 1-2

12--15

PL

Stopy aluminium stanowią istotną grupę wśród materiałów konstrukcyjnych wytwarzanych na świecie. Szacuje się, że w krajach wysoko rozwiniętych zapotrzebowanie na ten surowiec stale się zwiększa, a ilość produkowanego aluminium jest jednym z wyznaczników uprzemysłowienia danego regionu.

XX

Aluminium alloys are an important group among construction materials produced in the world. It is estimated that in highly developed countries the demand for this raw material is constantly increasing and the amount of produced aluminium is one of the determinants of the industrialisation of a given region.

13

Metoda melt-spinning w wytwarzaniu amorficznych stopów aluminium

Młynarek-Żak Katarzyna, Lis Mateusz, Babilas Rafał

LAB Laboratoria, Aparatura, Badania

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2021

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R. 26, nr 4

38--40

14

Effect of arc stud welding parameters on the microstructure and mechanical properties of AA6061 and AA5086 aluminium alloys

Razzaq M. K. A., Abood A. N.

Journal of Achievements in Materials and Manufacturing Engineering

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2021

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Vol. 108, nr 1

24--34

EN

Purpose: This paper aims to investigate the effect of arc stud welding (ASW) process parameters on the microstructure and mechanical properties of AA6061-T6 and AA5086-H116 joint. Design/methodology/approach: ASW process was done with argon as a shielding gas. Optical microscope (OM), scanning electron microscope (SEM), and X-Ray Diffraction (XRD) were employed to investigate the influence of welding current, welding time, and gas flow-rate on the microstructure of the fusion zone (FZ). Torque strength and Microhardness tests were used to evaluate the mechanical properties of the welded joints. Findings: OM and SEM showed a cellular dendritic structure with equiaxed zone and columnar dendritic are forming at welding zone and weld interface. XRD analysis showed the precipitation of Mg2Si and Al3Mg2 in the similar and dissimilar joints. Similar ASW of AA6061-T6/AA6061-T6 recorded 19 N.m torque strength, while dissimilar welding of AA6061-T6/AA5086-H116 registered 23 N.m. With increasing heat input, grains in Fusion Zone (FZ) and Heat Affected Zone (HAZ) coarsen and the hardness in both zones decreased. The hardness of similar weldments indicated a remarkable softening of FZ, while lower hardness values were registered in HAZ of dissimilar weldments. Softening of both weldments is due to the dissolution of the strengthening precipitates. Hot cracks exist with similar weldments, while no cracks evidence with dissimilar weldments. Research limitations/implications: The main challenge in this work was how to minimize porosity level and how to avoid hot crack in the FZ. Practical implications: The application of ASW with ceramic ferrule has an important role in different production areas such as; automobile industry, aircraft applications, and appliances industry. Originality/value: Study the effect of welding current, welding time, and gas flow-rate of ASW process on microstructure and mechanical properties of AA6061-T6 and AA5086-H116 joint.

15

Study of the influence of chemical elements and production technology parameters on aluminium sheets properties designed for bottle closures drawing process

Rutecki Paweł, Muzykiewicz Wacław, Sulewski Leszek

Inżynieria Materiałowa

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2021

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Vol. 42, nr 2-3

16--23

EN

Aluminium sheets designed for bottle closure production must be characterized with enhanced drawability and highly homogeneous properties ensuring problem-free production process with stable technological scrap level. Closure-stock material shall be produced in very narrow set of mechanical properties and should be characterized with thermal resistance in paint hardening process. This work presents results of study carried out on innovative aluminium alloy produced on the basis of post-consumed and post-produced scrap recycling. Hot-rolled strips with entry thickness 4.5 mm were rolled down to final thickness 0.225 mm in cold rolling and intermediate annealing process. Then cold-rolled sheets were undergone thermal process as simulation of paint hardening cycle. On the basis of mechanical properties, microstructure and technological tests results, influence of additional chemical elements added to aluminium alloys in secondary remelting process on properties of sheets designed for caps deep drawing process was determined. It was stated that additional chemical elements added to aluminium alloys in secondary remelting process increases hardening mechanism (grain size refining, solid solution strengthening, strain hardening) that reflects on higher sheets strength without any negative effects on formability and drawability.

PL

Blachy ze stopów aluminium do produkcji zakrętek muszą charakteryzować się wysoką podatnością do głębokiego tłoczenia i wysoką jednorodnością własności, zapewniającą bezproblemowy przebieg procesu tłoczenia z powtarzalną, zaplanowaną wielkością odpadu technologicznego. Materiał na zakrętki powinien posiadać stabilny w wąskim zakresie poziom własności mechanicznych, a także wysoką odporność termiczną w procesie cieplnego utrwalania lakieru. W pracy przedstawiono wyniki badań, wykonanych na nowatorskim stopie aluminium, który zaprojektowany został na bazie pełnego recyklingu poamortyzacyjnych oraz poprodukcyjnych złomów aluminiowych. Blachy walcowano na zimno na grubość finalną 0,225 mm z grubości początkowej wsadu po walcowaniu na gorąco 4,5 mm (z wykorzystaniem obróbki cieplnej międzyoperacyjnej), a następnie poddano procesowi termicznej obróbki, symulującej proces utwardzania lakieru. Na podstawie badań własności mechanicznych, obserwacji struktury materiału oraz badań technologicznych blach określono wpływ zawartości pierwiastków stopowych (wprowadzonych do stopu w procesie wtórnego przetopu) na własności blach przeznaczonych do tłoczenia zakrętek. Wykazano, że wprowadzenie do metalu dodatkowych pierwiastków stopowych drogą wtórnego przetwórstwa powoduje zwiększenie udziału mechanizmów umocnienia (rozdrobnienie ziarna, umocnienie roztworowe, umocnienie odkształceniowe), co przekłada się na wzrost własności wytrzymałościowych blach do głębokiego tłoczenia, bez obniżenia ich własności plastycznych.

16

Experimental and Numerical Stress State Assesment in Refill Friction Stir Spot Welding Joints

Gadalińska Elżbieta, Kubit Andrzej, Trzepieciński Tomasz, Moneta Grzegorz

Fatigue of Aircraft Structures

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2021

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Iss. 13

54--71

EN

Refill Friction Stir Spot Welding (RFSSW) is a technology used for joining solid materials that was developed in Germany in 2002 by GKSS-GmbH as a variant of the conventional friction stir spot welding (FSSW) [1]. In the RFSSW technology, the welding tool consists of a fixed outer part and rotating inner parts, which are called a pin and a sleeve. The tool for RFSSW is designed to plasticize the material of the parts to be joined by means of a rotary movement. The design of the tool allows independent vertical movement of both elements of the welding tool. This allows obtaining spot welds without creating holes that could weaken the structure. The main advantage of RFSSW is the potential for replacing the technologies that add weight to the structure or create discontinuities, such as joining with screws or rivets. Thus, RFSSW has great potential in the automotive, shipbuilding and aviation industries. Furthermore, the technology can be used to join different materials that could not be connected using other joining methods. The main objective of this work is to understand the physical and mechanical aspects of the RFSSW method - including the residual stress state inside the weld and around the joint. The results of the investigations can help to determine optimal parameters that could increase the strength and fatigue performance of the joint and to prove the significant advantage of RFSSW connections over other types of joints. The work assumes the correlation of two mutually complementary investigation methods: numerical analyses and experimental studies carried out with diffraction methods. The comparison between numerical and experimental results makes potentially possible the determination of degree of fatigue degradation of the material by observing the macroscopic stress state and the broadening of the diffraction peak width (FWHM), which is an indicator of the existence of micro-stress related to the dislocation density and grain size.

17

Friction stir welding of wrought aluminium alloy EN AW-6082

Miara Damian

Biuletyn Instytutu Spawalnictwa w Gliwicach

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2021

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Vol. 65, No. 4

15--24

EN

The article presents results of the friction stir welding of 6 mm thick plates made of wrought aluminium alloy EN AW-6082. Tests discussed in the article involved the identification of the effect of primary welding process parameters on the quality of welds. Test welds were subjected to visual tests, measurements of temperature (inside the weld), tensile strength tests as well as macro and microscopic metallographic tests and structural tests (performed using a scanning electron microscope). The application of the appropriate values of the primary welding process parameters (i.e. the tool rotation rate and the welding rate) enabled the obtainment of the high and repeatable quality of FSW joints made of aluminium alloy EN AW-6082. The test results presented in the article can offer technological solutions for potential users representing, among others, the railway, automotive or aviation industries.

PL

W artykule przedstawiono wyniki badań dotyczące zgrzewania metodą FSW płyt ze stopu aluminium przerabianego plastycznie EN AW-6082 o grubości 6 mm. Sprawdzono wpływ głównych parametrów procesu zgrzewania na jakość zgrzein. Przeprowadzono badania jakości zgrzein, w tym badania wizualne, pomiary temperatury wewnątrz zgrzeiny, badania: wytrzymałości zgrzein na rozciąganie oraz metalograficzne makro- i mikroskopowe, a także struktury na skaningowym mikroskopie elektronowym. Zastosowanie odpowiednich wartości głównych parametrów technologicznych zgrzewania, tj. prędkości obrotowej narzędzia oraz prędkości zgrzewania, umożliwia uzyskanie wysokiej i powtarzalnej jakości złączy FSW ze stopu aluminium EN AW-6082. Wyniki badań pozwolą opracować rozwiązanie technologiczne, które może zostać wykorzystane przez przedsiębiorców z branży kolejowej, motoryzacyjnej i lotniczej.

18

Electrodynamic treatment of structural elements made of aluminium and magnesium alloys

Lobanov Leonid M., Pashchin Nikolaj A., Kondratenko Igor P., Sidorenko Yuriy M., Ustimenko Pawel R.

Biuletyn Instytutu Spawalnictwa w Gliwicach

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2021

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Vol. 65, No. 2

17--30

EN

The article discusses the electrodynamic treatment (EDT) of thinwalled welded structures and EDT equipment, presents results of mathematical modelling concerning the effect of EDT on stresses in welded sheets made of aluminium alloy AMg6 as well as discusses the effect of EDT on the plastic strain mechanism. In addition, the article presents tests results concerning the effect of EDT during the welding of ship structures made of AMg6 plates and discusses the role of EDT in bulge formation. In addition, the article discusses the application of EDT during the repair welding of aero-engine nacelles made of magnesium alloy ML10 and the effect of EDT on openings in an airplane wing stinger in relation to its service life.

PL

Omówiono zasadę obróbki elektrodynamicznej (EDT) cienkościennych konstrukcji spawanych i opracowaną aparaturę do EDT. Przedstawiono wyniki modelowania matematycznego wpływu EDT na stan naprężenia spawanej płyty ze stopu AMg6 oraz badań wpływu elektrodynamicznych oddziaływań na mechanizm odkształcenia plastycznego. Podano wyniki wpływu EDT na odkształcenia typu wybrzuszenie powstające podczas spawania konstrukcji okrętowych z blach AMg6. Omówiono przykład zastosowania EDT podczas spawania naprawczego gondoli silnika lotniczego z stopu magnezu ML10 oraz wpływ EDT otworów podłużnicy skrzydła samolotu na trwałość zmęczeniową.

19

Possibilities of Bifilm Amount Reduction in Al Castings by Gating System Design Optimization

Brůna Marek, Galčík M., Sládek A., Martinec D.

Archives of Metallurgy and Materials

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2021

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Vol. 66, iss. 2

549--559

EN

Submitted work deals with the possibilities of reducing reoxidation by improved gating system design. The result of the reoxidation is the of furled oxide layers - bifilms. During experimental works, non-pressurized and naturally pressurized gating systems designs were introduced and evaluated. Mechanical properties, fracture area, hot tearing index, bifilm index and EDX analysis were used during evaluation. Paper aim is also to clarify the reoxidation phenomenon by visualization with the aid of ProCAST numerical simulation software. Achieved results clearly confirmed the positive effect of the naturally pressurized gating system, main emphasis needs to focus on finding the proper way to reduce the melt velocity. By using vortex element extension at the end of the runner was achieved positive results in term of reoxidation suppression.

20

An Attempt to Use Various Metallurgical Slags in the Modification Processes of Casting Alloys

Sitko Jacek

Archives of Metallurgy and Materials

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2021

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Vol. 66, iss. 4

1067--1074

EN

The paper presents preliminary results of research on the use of certain smelting slags in the process of modification of casting alloys, leading to a change in the structure of these alloys and improvement of their mechanical and operational properties. The positive effect of ground copper slag with a fraction below 0.1 mm on the effect of modifying the hypoeutectic silumin AlSi7Mg towards changing the morphology of coarse-grained eutectic to fine-dispersive was demonstrated. The modifying effect also applies to the pre-eutectic α phase and results in the formation of additional crystallization sites (nucleation process), which was demonstrated by the thermal ATD solidification analysis, showing an increase in the temperature Tliq and TE max. The positive and noticeable influence of the mixture of copper and steel slag on the surface modifying effect of fragmentation of the structure was demonstrated in casting nickel superalloy IN-713C. Based on the results of research conducted so far on the modifying effect of cobalt aluminate, a hypothetical model of the impact of reduced metallic components of the applied metallurgical slags on the nucleation process and shaping of the microstructure of nickel alloys was developed.