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1

Trwałość wysokocyklowa stopów metali lekkich

Cieśla M., Marek A.

Hutnik, Wiadomości Hutnicze

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2015

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Vol. 82, nr 8

546--548

PL

Praca dotyczy badań zmęczenia wysokocyklowego przerabianych plastycznie stopów metali lekkich, mających zastosowanie między innymi w technice lotniczej. Przydatność stopów metali lekkich na elementy konstrukcyjne urządzeń determinowana jest, oprócz ich niskiej gęstości, także szeregiem korzystnych właściwości mechanicznych, a w przypadku zastosowań na elementy środków transportu dodatkowo dobrą wytrzymałością zmęczeniową. Materiał do badań stanowiły pręty po przeróbce plastycznej na gorąco ze stopów magnezu AZ31 i AZ61, dwufazowego stopu tytanu Ti-6Al-4V oraz stopu aluminium 2017A (T451). Do badań zmęczenia wysokocyklowego w warunkach zginania obrotowego przy współczynniku asymetrii cyklu R= −1 wykonano próbki walcowe o średnicy d0=8 mm. Przeprowadzono próby w zakresie ograniczonej wytrzymałości zmęczeniowej. Na podstawie uzyskanych wyników opracowano charakterystyki trwałości zmęczeniowej badanych materiałów. W badaniach zmęczenia wysokocyklowego największą trwałość wykazał stopu tytanu Ti-6Al-4V.

EN

The paper refers to the research on high-cycle fatigue of wrought light metal alloys, applied, inter alia, in the aviation technology. Usefulness of the light metal alloys for various structural components is determined, apart from their low density, by a number of favourable mechanical properties and in the case of their use for components of transport means - additionally by good fatigue strength. The material for the research consisted of hot-worked rods made of AZ31 and AZ61 magnesium alloys, Ti-6Al-4V two-phase titanium alloy and 2017A (T451) aluminium alloy. Cylindrical specimens with a diameter of d0 = 8 mm were made for the fatigue test under high-cycle rotary bending conditions with the cycle asymmetry coefficient R = −1. The tests were carried out for a limited fatigue strength range. Based on the obtained results, fatigue life characteristics of the tested materials were drawn up. It was found that the Ti-6Al-4V alloy has the longest fatigue life.

2

Modification of the Structure and Properties of the Titanium Alloy Ti6Al4V in Biomedical Applications

Klimas J., Łukaszewicz A., Szota M., Nabiałek M.

Archives of Metallurgy and Materials

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2015

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Vol. 60, iss. 3A

2013--2018

EN

From the time when Per-Ingvar Brånemark discovered oseointegration properties of titanium in 1952 a large-scale studies on the issue of usability this metal in surgery were started. Thanks to the parallel research conducted on independent centers managed to get a number of metal alloys which were implanted into the human body in the form of implants. Among the alloys produced appeared alloy of aluminum and vanadium Ti6Al4V. The mechanical properties, high biocompatibility, low density and for this relatively low-cost, caused that the alloy began to be used as a material for biomedical applications. In the present article analyzed the possibility of modifying the properties of the alloy, by choosing another method of producing – method of injection casting with suction. A comparative analysis of the input material - the alloy commercially produced in the form of a rod of the same material melted by injection under vacuum and in air were carried out. The studies results indicate that using method of injection casting with suction to produce the final item influence on significant improvement in mechanical properties as a result of fragmentation of the grains at the element surface. The mechanical properties play a key role in a tissue-implant-bone system.

PL

Od 1952roku, kiedy to Per-Ingvar Brånemark odkrył osteointegracyjne właściwości tytanu, rozpoczęto w znacznym stopniu badania w kwestii przydatności tego metalu w chirurgii. Poprzez badania prowadzone przez kilka niezależnych ośrodków naukowo - badawczych w organizm człowiek wszczepiono szereg stopów metali w postaci implantów. Wśród wszczepianych stopów pojawił się Ti6Al4V, którego charakteryzują bardzo dobre właściwości mechaniczne, wysoka zgodność biologiczna, niska gęstość przy stosunkowo niskiej cenie. Spowodowało to, że stop ten zaczął być używany jako materiał do zastosowań biomedycznych. W niniejszym artykule przeanalizowano możliwość modyfikowania właściwości stopu, poprzez zmianę metody wytwarzania, wtłaczania w atmosferze próżni lub w powietrzu. Przeprowadzono analizę porównawczą materiału wyjściowego - stopu, jaki wytwarza się komercyjnie w przemyśle w postaci prętów, a materiału uzyskanego metodą wtłaczania z zastosowaniem próżni oraz w powietrzu. Wyniki badań wykazują, że zastosowanie metody wtłaczania wpływa na znaczącą poprawę właściwości mechanicznych w wyniku rozdrobnienia ziaren na powierzchni elementu. Właściwości mechaniczne odgrywają istotną rolę w połączeniach: tkanka - implant - kość.

3

Kształtowanie właściwości użytkowych stopu tytanu Ti6Al4V w niskotemperaturowym procesie azotowania jarzeniowego

Tarnowski M., Garbacz H., Ossowski M., Wierzchoń T.

Inżynieria Materiałowa

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2014

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Vol. 35, nr 5

420--422

PL

Tytan i jego stopy są szeroko stosowane w medycynie, jednak ich mała odporność na zużycie przez tarcie oraz występowanie zjawiska metalozy (przechodzenia składników stopu do organizmu ludzkiego) ograniczają ich zastosowanie na implanty kostne. W pracy przeprowadzono na stopie tytanu Ti6A4lV proces azotowania jarzeniowego w temperaturze 680°C. Stwierdzono, że taka temperatura nie wpływa na mikrostrukturę stopu tytanu, co gwarantuje zachowanie jego dobrych właściwości mechanicznych. Analizę mikrostruktury i składu fazowego wykonano za pomocą skaningowego mikroskopu elektronowego oraz metody XRD. Parametry chropowatości próbek zbadano za pomocą profilometru optycznego. Wykonano pomiary mikrotwardości, odporności na zużycie przez tarcie oraz korozji metodą potencjodynamiczną. Stwierdzono, że wytworzone w procesie azotowania jarzeniowego w obniżonej temperaturze warstwy poszerzają zakres zastosowania stopu Ti6Al4V.

EN

Titanium and its alloys are widely used in medicine but their low wear resistance and release of titanium alloy elements into surrounding tissues (metalosis effect) limit their use as bone implants. This study presents the glow discharge nitriding process conducted at a temperature 680°C. This temperature does not affect the Ti6Al4V titanium alloy microstructure, what guaranties preserving its good mechanical properties. The microstructural and phase composition analysis was carried out using SEM microscopy and X-ray diffraction. Optical profilometer was applied for layer surface topography measurements. Microhardness and frictional wear resistance and corrosion resistance (potentiodynamic method) investigations were performed. Layers produced by low temperature glow discharge assisted nitriding process broaden the range of application of Ti6Al4V alloy due to good corrosion and wear resistance.

4

Application of injection method to modify titanium alloy Ti6Al4V

Klimas J., Łukaszewicz A., Szota M., Nabiałek M.

Engineering of Biomaterials

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2014

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Vol. 17, no. 128-129

91--92

EN

In the present work, the samples were subjected to a comparative analysis of the titanium alloy Ti6Al4V prepared by various methods. The research included a comparison of the following properties of manufactured elements: microstructure, phase composition and surface roughness. The test results clearly showed that these properties are different when using different method of casting. These changes allows the use of prepared elements in medicine.

5

Forming properties of titanium alloy for biomedical applications

Klimas J., Łukaszewicz A., Szota M., Bukowska A., Nabiałek M.

Archives of Materials Science and Engineering

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2014

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Vol. 70, nr 2

61--69

EN

Purpose: A preparation of surface layers on the surface of the titanium alloy Ti-6Al-4V as a result of thermo-chemical treatment and a comparison of obtained layers from baseline. The results of studies comparing the structure and properties of titanium alloy Ti-6Al-4V with produced surface layers. Design/methodology/approach: Test samples were the titanium alloy Ti-6Al-4V, which was subjected to heat-chemical treatment, consisting in annealing components in air for 1 hour at each temperature: 400ºC, 450ºC, 500ºC, 550ºC, 600ºC. To achieve pursued objective the following tests: microstructural observation of the cross section, which made it possible to study the thickness of the produced coating study were performed, a study of the geometry of the surface was performed – roughness and hardness were measured. Wear resistance of each layer was shown. Ringer liquid simulates the conditions similar in the human body. Results: Through the use of thermo-chemical treatment, it is possible to obtain surface layers of different thicknesses on titanium alloy Ti-6Al-4V. A method used for thermo-chemical treatment can produce a layer that affect the increase in hardness, whose value is almost twice higher than that of the without workup alloy. The evaluation of surface topography allowed to state that all samples were subjected to thermal-chemical treatment have a similar level of the development of the surface. The lowest roughness has alloy, annealed at 500°C. The study shows that the corrosion resistance of titanium alloy is dependent on the thickness of the obtained surface layers. The highest corrosion potential has the sample annealed at 500°C. Originality/value: The paper summarizes comparative studies of titanium alloy and the alloy with produced oxide layers, proving by far superior to the results with produced alloy layers, which one were produced by the injection method, than in the case of alloys produced by the drawing method.

6

Comparison of results obtained using the injection method of preparation of solid amorphous alloys with and without suction

Klimas J., Łukaszewicz A., Szota M., Nabiałek M., Dobrzańska-Danikiewicz A.

Archives of Materials Science and Engineering

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2014

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Vol. 67, nr 2

77--83

EN

Purpose: The study compares the structure and properties titanium alloy Ti-6Al-4V produced by injection method allowing the production of massive amorphous materials in two varies – with and without suction. Design/methodology/approach: Samples were produced form titanium alloy Ti-6Al-4V produced by injection method. Structures and properties were compared of the same alloy but with different conditions in production process – with and without suction. To achieve the objective perused the following tests were carried out: study of phase composition by X-ray diffraction, observation of microstructure by using optical microscope and SEM, study of surface geometry – roughness, abrasion resistance tests and microhardness tests. Results: Microstructural studies have allowed to observe that the titanium alloy Ti-6Al-4V produced by injection method in both varies – with and without suction during injection to copper mold, has structure partially crystalized – nanocrystalline. In structure occur the crystal nuclei and lack of arrangement and regularity. The study of microhardness showed 100 HV 0.1 units higher hardness value in the embodiment with suction in comparison to the variant without suction. Titanium alloy Ti-6Al-4V produced with suction has better abrasion resistance in comparison with same alloy without suction. Alloy produced with suction has lower development area. Originality/value: The paper presented studies of massive amorphous and nanocrystalline alloys produced by alternative method – injection casting in two variants – with and without suction. That kind of production allow produced alloys with same chemical composition as commercial but with far better properties.

7

Comparison of properties of Ti-6Al-4V titanium alloys producedby two methods: by continuous casting and injection casting, in aspect of medical applications

Klimas J., Szota M., Nabiałek M., Łukaszewicz A., Bukowska A.

Journal of Achievements in Materials and Manufacturing Engineering

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2013

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Vol. 61, nr 2

263--267

EN

Purpose: The paper presents a comparison of the structure and properties of titanium alloys Ti-6Al-4V produced by two methods: conventional and injection casting which allows obtaining solid amorphous alloys. Design/methodology/approach: Test samples are titanium alloys Ti-6Al-4V produced by two methods: conventional and injection casting. To achieve assumed objective the followed test were performed: phase composition by X-ray diffraction, microstructure observation was carried out, preformed to study the geometry of the surface – roughness and abrasion resistance measurements. Research limitations/implications: Observation of microstructures revealed that, titanium alloy Ti-6Al-4V produced by conventional method has a crystalline ordered structure which is typical for materials produced by continuous casting, while the titanium alloy produced by injection casting has a structure partially crystalline, and in most predominates amorphous structure which is characterized by a lack of order and regularity. Confirmation of structural studies were obtained diffraction records from qualitative X-ray analysis. Sample which was produced by continuous casting has higher rate of roughness than sample produced by injection casting. Titanium alloy produced by injection casting has higher rate of abrasion resistance than alloy produced by conventional casting. Higher roughness and higher abrasion resistance, these properties are beneficial for the process of fusion of the implant with the tissues in living organism, that same is desired in case when alloy will be used for biomedical applications. Originality/value: The paper presented study of solid amorphous alloys which were produced by injection casting. That kind of production allowed to achieve much better properties than for alloys produced by conventional method - continuous casting.

8

Comparison of mechanical properties of Ti-6Al-4V titanium alloy produced by the conventional method and the injection

Smolarczyk P., Łukaszewicz A., Szota M., Nabiałek M., Bukowska A.

Journal of Achievements in Materials and Manufacturing Engineering

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2013

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Vol. 61, nr 2

281--288

EN

Purpose: In these paper was were characterized mechanical properties of titanium alloy Ti-6Al-4V, which were produced by two methods - conventional casting and injection casting. Studies were presented by comparing of samples which were produced by these methods. Design/methodology/approach: Samples were produced by two methods – conventional and injection casting. To achieve the objective were performer the following steps: the microstructure was carried out, the analysis of mechanical properties was done (microhardness), study of surface roughness was made, research of abrasion was made and phase composition by X-ray diffraction was made. After then then a comparison of these studies between these samples was made. Findings: The study of the microstructure was observed that the titanium alloy Ti-6Al-4V prepared by the conventional method, it has equiaxed and globular structure. In contrast, titanium alloy produced by the injection has strips structure, where phase α’ is on phase β border. Further studies have shown that a sample of titanium alloy Ti-6Al-4V produced by injection it has a much greater tribological resistance because it has a higher microhardness and much greater roughness than the sample of the same alloy produced by the conventional method. Originality/value: In this article conducted a comparative characteristics for the two production methods - conventional and injection - titanium alloy Ti-6Al-4V. The research indicated that much better mechanical properties are characterized alloys produced by injection.

9

Comparative description of structure and properties of Ti-6Al-4V titanium alloy for biomedical applications produced by two methods: conventional (molding) and innovative (injection) ones

Klimas J., Szota M., Nabiałek M., Łukaszewicz A., Bukowska A.

Journal of Achievements in Materials and Manufacturing Engineering

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2013

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Vol. 61, nr 2

195--201

EN

Purpose: In paper characterized two methods produced titanium alloy: hitherto used in industry – conti-casting and innovative method of obtaining solid amorphous alloy by injection casting. The results of studies comparing the structure and properties of the alloy Ti-6Al-4V produced by both methods. Design/methodology/approach: Test samples were titanium alloy Ti-6Al-4V produced by two methods: conventional and injection. To achieve the objective pursued performed the following tests: microstructure observation was carried out, the analysis of mechanical properties (microhardness) and corrosion resistance tests were performed in Ringer’s liquid, which simulates the human body fluids. Findings: Microstructural study allowed to observe that titanium alloy T-6Al-4V produced by conventional method has crystalline ordered structure which is characteristic for materials obtained by drawing, with oriented grains and elongated in the direction of drawing. Same alloy produced by injection casting has amorphous structure with occurrences of the single-crystal seeds, that kind of structure has lack of order and regularity. The microhardness study showed, that titanium alloy Ti-6Al-4V produced by drawing has a hardness of less than twice for the same alloy produced by the injection. The corrosion tests conducted in an environment that simulates human body fluids, revealed showed that the materials made by injection have significantly corrosion potential than alloy obtained by drawing. Originality/value: The paper presents a comparative study of titanium alloy produced by drawing and massive amorphous alloy produced by unconventional method – injection casting. By the results proved that the alloy produced by injection has much better properties than alloy produced by drawing.

10

Spiekanie tytanu i hydroksyapatytu metodą iskrowego spiekania plazmowego

Garbiec D., Heyduk F.

Hutnik, Wiadomości Hutnicze

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2012

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Vol. 79, nr 8

569--574

PL

W artykule omówiono metodę iskrowego spiekania plazmowego SPS (ang. Spark Plasma Sintering). Przedstawiono graficznie proces spiekania wraz ze schematem urządzenia oraz wyjaśniono mechanizm spiekania impulsami prądu stałego. Opracowano proces spiekania proszku stopu tytanu Ti6Al4V oraz proszku hydroksyapatytu (HA) wraz z 5 % dodatkiem srebra. Ocenie za pomocą mikroskopu skaningowego poddano powierzchnię uzyskanych próbek. Na podstawie badań zaproponowano parametry wytwarzania próbek przeznaczonych do badań in-vitro. Wykazano, że minimalną temperaturą przy której można uzyskać powłokę HA charakteryzującą się dobrym połączeniem z podłożem jest 750 °C.

EN

The article discusses the method of Spark Plasma Sintering. Presented graphically sintering process and SPS device diagram. Explained the mechanism of sintering DC pulses. Titanium alloy powder Ti6Al4V and hydroxyapatite powder with 5 % silver sintering process was developed. Evaluated by scanning electron microscopy were obtained surface samples. Based on the research proposed parameters for sample preparation on in-vitro. It was shown that the minimum temperature at which the HA coating can be characterized by good access to the substrate is 750 °C.

11

Forging on Hammer of Rim Forging from Titanium Alloy Ti6Al4V

Gontarz A., Pater Z., Drozdowski K.

Archives of Metallurgy and Materials

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2012

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Vol. 57, iss. 4

1239-1246

EN

This paper presents the research results of hammer forging process of a plane wheel rim forging from titanium alloy Ti6Al4V. The research works were divided into two stages. The first concerned the theoretical analysis based on numerical simulations of the worked out forging technology. Distributions of temperature, strain, damage criterion according to Cockroft-Latham, material flow kinematics and force parameters were evaluated. It was stated that the danger of overheating and material cracking in the forging does not exist. Large force values present in the process means that problems with tools durability may appear. Satisfactory results of the theoretical analysis provided the basis for conducting the second stage of the research works, that is experimental tests in industrial conditions. After dies making forging tests were made in one Polish forging plants, in which a product of good quality was obtained. Manufactured forgings were free from cracks, shape faults and fulfilled requirements concerning mechanical properties.

PL

W artykule przedstawiono wyniki badan procesu kucia na młocie odkuwki felgi koła samolotowego ze stopu tytanu Ti6Al4V. Prace badawcze podzielono na dwa etapy. Pierwszy dotyczył analizy teoretycznej opartej na symulacjach numerycznych opracowanej technologii kucia. Dokonano oceny rozkładu temperatury, odkształcenia, kryterium zniszczenia według Cockrofta-Lathama, kinematyki płynięcia materiału i parametrów siłowych. Stwierdzono, ze nie zachodzi niebezpieczeństwo przegrzania i pękania materiału w odkuwce. Duże wartości sił występujących w procesie świadczą o możliwości występowania problemów z trwałością narzędzi. Pozytywne wyniki analizy teoretycznej dały podstawę do przeprowadzenia drugiego etapu badan tj. prób doświadczalnych w warunkach przemysłowych. Po wykonaniu matryc przeprowadzono próby kucia w jednym z polskich zakładów kuźniczych, w których uzyskano wyrób charakteryzujący się dobra jakością. Wykonane odkuwki pozbawione były pęknięć, wad kształtu i spełniały wymagania odnośnie własności mechanicznych.

12

The quality of welded connections elements from the steel 30HGS and titanium alloy Ti6Al4V

Łapiński Z., Dziedzic A., Bochnowski W., Adamiak S., Sandomierski S.

Archives of Foundry Engineering

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2012

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Vol. 12, iss. 2

159-166

EN

The aim of that work was the evaluation of the quality of welded connections elements (welds) from the 30HGS steel and titanium alloy Ti6Al4V. The metallographic, factographic tests were used, and measurements of microhardness with the Vickers method. In the head weld of the 30HGS steel there were non-metallic partial division and bubbles observed. The average microhardness in the head connection was 320 HV0.1. There was no significant increase/decrease observed of microhardness in the head influence zone of the weld. There was a good condition of head connections observed, in accordance with the standard EN12517 and EN25817. In the head weld of Ti6Al4V titanium alloy there were single, occasional non-metallic interjections and bubbles observed. There were no cracks both on the weld, and on the border of the heat influence zone. The value of microhardness in head connection was in the range 300-445 HV0.1. Reveal a very good condition of the head connections in accordance with the standard EN12517 and EN25817. The factographic tests prove the correctness of welded connections done and then heat treatment in case of steel and titanium alloy.

13

Wpływ parametrów dynamicznego nagniatania rozproszonego na rozkład naprężeń własnych w warstwie wierzchniej stopu tytanu

Zaleski K.

Inżynieria Powierzchni

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2011

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nr 3

48-52

PL

W artykule przedstawiono metodę fizycznego modelowania procesu dynamicznego nagniatania rozproszonego, która umożliwia kontrolę ruchu narzędzi nagniatających oraz zachowanie sposobu nanoszenia odcisków na obrabianą powierzchnię charakterystycznego dla nagniatania rozproszonego. Zastosowanie tej metody umożliwiło przeprowadzenie badań wpływu energii zderzenia narzędzia nagniatającego z obrabianym przedmiotem oraz gęstości zderzeń na rozkład naprężeń własnych w warstwie wierzchniej próbek ze stopu tytanu Ti-6Al-4V. Naprężenia własne badane były metodą mechaniczną. Stwierdzono, że w przyjętym zakresie badanych parametrów energia zderzenia w większym stopniu wpływa na rozkład naprężeń własnych, niż gęstość zderzeń.

EN

The paper presents a method of physical modeling of shot peening process which enables control of the movement of peening tools and preserves the manner of impacting the machined surface that is characteristic of shot peening. Studies of the influence of the energy with which the peening tool impacts the target workpiece and impact density on the residual stresses distribution in surface layer of specimens of titanium alloy Ti-6Al-4V have been possible to conduct with this method. The residual stresses have been investigated with the aid of mechanical method. It was observed that within the adopted range of the tested parameters, impact energy affected residual stresses distribution to a greater degree than impact density did.

14

Microstructure of the surface layer of a Ti6Al4V alloy and X5CrNi18-10 steel after laser treatment

Rozmus-Górnikowska M., Kusiński J., Blicharski M., Major R.

Inżynieria Materiałowa

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2010

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Vol. 31, nr 3

340-343

EN

The effect of the Laser Shock Processing (LSP) on the microstructure and roughness of the surface of Ti6Al4V titanium alloy and X5CrNi18-10 austenitic stainless steel was studied. LSP process was performed with a high- power Q-switched Nd:YAG ReNOVALaser, operating in a pulse mode (18 ns), with a power density of 1 GW/cm2. The microstructure of the surface layer of the treated materials were analysed by scanning and transmission electron microscopy. The roughness of the surface was measured by TOPO-L50 equipment. It has been found that the laser shock processing caused plastic deformation of the surface layer of the investigated materials. The conditions of treatment caused that the process was not purely mechanical but thermo-mechanical.

PL

W pracy przedstawiono wyniki badań mikrostruktury oraz chropowatości warstwy wierzchniej stopu tytanu Ti6Al4V i stali austenitycznej X5CrNi18-10. Laserowe odkształcanie przeprowadzono za pomocą lasera impulsowego ReNOVALaser Nd:YAG z modulacją Q, przy gęstości mocy 1 GW/cm2 i czasie trwania impulsu 18 ns. Do oceny wpływu laserowego odkształcenia na mikrostrukturę warstwy wierzchniej wykorzystano skaningową i transmisyjną mikroskopię elektronową. Chropowatość powierzchni zmierzono profilometrem TOPO-L50. Stwierdzono, że laserowa obróbka powoduje odkształcenie plastyczne warstwy wierzchniej badanych materiałów. Przy tak dobranych parametrach proces nie jest jednak czysto mechaniczny, ale cieplno-plastyczny.

15

Wpływ dynamicznego nagniatania rozproszonego na trwałość zmęczeniową elementów ze stopu tytanu Ti-6Al-4V

Zaleski K.

Eksploatacja i Niezawodność

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2009

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nr 4

65-71

PL

W pracy przedstawiono metodę kontrolowanego dynamicznego nagniatania rozproszonego, która umożliwia kontrolę ruchu narzędzi nagniatających oraz zachowanie sposobu nanoszenia odcisków na obrabianą powierzchnię charakterystycznego dla nagniatania rozproszonego. Metoda ta umożliwiła przeprowadzenie badań wpływu energii zderzenia narzędzia nagniatającego z obrabianym przedmiotem oraz liczby zderzeń przypadających na jednostkę powierzchni obrabianej, nazywanej gęstością zderzeń, na trwałość zmęczeniową próbek ze stopu tytanu Ti-6Al-4V. Trwałość zmęczeniową badano na specjalnym stanowisku, umożliwiającym obustronne, cykliczne zginanie badanej próbki. Stwierdzono, że w przyjętym zakresie badanych parametrów energia zderzenia w większym stopniu wpływa na trwałość zmęczeniową niż gęstość zderzeń. Z porównania trwałości zmęczeniowej próbek nagniatanych i szlifowanych wynika, że obróbka nagniataniem dynamicznym powoduje kilkakrotny wzrost trwałości zmęczeniowej próbek ze stopu Ti-6Al-4V. Badania doświadczalne wykazały, że obróbka kulkowaniem wibracyjnym umożliwia uzyskanie podobnego wzrostu trwałości zmęczeniowej jak po kontrolowanym dynamicznym nagniataniu rozproszonym.

EN

The study presents a method of controlled random shot peening which enables control of the movement of peening tools and preserves the manner of impacting the machined surface that is characteristic of shot peening. This method has made it possible to conduct studies of the influence of the energy with which the peening tool impacts the target workpiece and the number of impacts per unit of machined area, called impact density, on the fatigue life of specimens of titanium alloy Ti-6Al-4V. Fatigue life was examined on a special stand enabling symmetrical (double-sided) cyclic bending of the tested specimen. It was observed that within the adopted range of the tested parameters, impact energy affected fatigue life to a greater degree than did impact density. A comparison of fatigue life of shot peened and of polished specimens showed that shot peening caused a several-times increase in the fatigue life of specimens of titanium alloy Ti-6Al-4V. Experimental studies showed that vibratory ball peening allowed obtaining a similar increase in fatigue life as the one obtained for controlled shot peening.