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1
Content available Thermal-Derivative Analysis and Precipitation Hardening of the Hypoeutectic Al-Si-Cu Alloys
Smolarczyk P. E., Krupiński M.
Archives of Foundry Engineering
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2019
|
iss. 1
41--46
EN
The research focused on the influence of the solution temperature on the structure of precipitation hardening multi-component hypoeutectic aluminium alloys. The AlSi8Cu3 and AlSi6Cu4 alloys were used in the study and were subjected to a thermal-derivative analysis. The chemical composition and crystallization of phases and eutectics shift the characteristic points and the corresponding temperatures to other values, which affect to, for instance, the solution temperature. The alloys were supersaturated at 475°C (according to the determined temperature (TSol) and 505°C for 1.5 hours. Aging was performed at 180°C for 5 hours. The Rockwell hardness measurement, metallographic analysis of alloys by means of light microscopy as well as chemical and phase analysis using scanning electron microscopy and X-ray crystallography were carried out on alloys. The use of computer image analysis enabled the determination of the amount of the current Al2Cu phase in the alloys before and after heat treatment.
2
Content available Crystallization Process of Silicon Molybdenum Cast Iron
Stawarz M.
Archives of Foundry Engineering
|
2018
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Vol. 18, iss. 2
100--104
EN
The article presents results of studies of silicon – molybdenum cast iron (4.42% Si, 2.59% Mo and 2.48% C wt.-%) crystallization process. Metallographic analysis was carried out using SEM-scanning electron microscopy with the EDS system. In order to determine the phase composition, X-ray diffraction studies were performed. Thermo-Calc, a computer simulation program, was used to simulate the crystallization process. . The obtained data allowed to describe the effect of some elements on the crystallization process. The silicon phase of MnSi could not be identified during metallographic studies. Also, computer simulation of the crystallization process did not answer the question at which point the silicon phase of MnSi crystallizes in the tested alloy. Therefore, not all results obtained were linked to the registered crystallization process (TDA process). The EDS analysis revealed an unusual distribution of molybdenum in the microstructure of the sample, where it is clearly visible that the area enriched with this element is also the separation of spheroidal graphite. The possibility of occurrence of Mo-rich micro-areas found in graphite is considered. The case is debatable and difficult to resolve at this stage. Perhaps, at such a high concentration of molybdenum (2.59% Mo) in the alloy, conditions are created for simultaneously crystallization of graphite and molybdenum phases.
3
Content available Model of Cu-Al-Fe-Ni bronze crystallization
Pisarek B. P.
Archives of Foundry Engineering
|
2013
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Vol. 13, iss. 3
72--79
EN
According to the analysis of the current state of the knowledge shows that there is little information on the process of phase transformations that occur during the cooling Cu-Al-Fe-Ni hypo-eutectoid bronzes with additions of Cr, Mo and/or W, made additions individually or together, for the determination of: the type of crystallizing phases, crystallizing phases, order and place of their nucleation. On the basis of recorded using thermal and derivative analysis of thermal effects phases crystallization or their systems, analysis of the microstructure formed during crystallization - observed on the metallographic specimen casting ATD10-PŁ probe, analysis of the existing phase equilibrium diagrams forming elements tested Cu-Al-Fe-Ni bronze, with additions of Cr, Mo, W and/or Si developed an original model of crystallization and phase transformation in the solid state, the casting of high quality Cu-Al-Fe-Ni bronze comprising: crystallizing type phase, crystallizing phase sequence, place of nucleation.
4
Content available Effect of the remelting on transformations in Co-Cr-Mo prosthetics alloy
Kacprzyk B., Szymczak T., Gumienny G., Klimek L.
Archives of Foundry Engineering
|
2013
|
Vol. 13, iss. 3
47--50
EN
In the article we were studing the impact of the remelting on transformations in Co-Cr-Mo prosthetics alloy. The TDA curves were analyzed, the microstructure was examined, the analysis of the chemical composition and hardness using the Brinell method was made. It was found that the obtained microstructure of the alloys that we studied do not differ significantly. In all four samples, microscopic images were similar to each other. The volume, size and distribution of the phases remain similar. Analysis of the chemical composition showed that all the samples fall within the compositions provided for the test alloy. Further to this the hardness of the samples, regardless of the number of remeltings did not show any significant fluctuations and remained within the error limit. After analyzing all the results, it can be concluded that the remeltings of the alloys should not have a significant impact on their properties. Secondarily melted alloys can be used for prosthetics works.
5
Content available Structure and properties of new ecological copper alloys for fittings
Juszczyk B., Kulasa J., Cwolek B., Malec W., Wierzbicki Ł.
Archives of Foundry Engineering
|
2011
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Vol. 11, iss. 3 spec.
97--102
EN
The article presents the results of studies concerning the selection of the chemical composition of the new ecological copper alloys for fittings. It was analyzed, among other things, the impact of the content of bismuth, aluminum, iron and boron. Their solidification process was characterized on the grounds of thermal and derivative analysis (TDA). Also the microstructure and mechanical properties were analyzed. Casting properties were determined by the castability spiral test. It was found that zinc is an essential component of the tested group of alloys, determining the course of their crystallization, phase composition and microstructure. There was no significant effect from the other elements on the course of crystallization. The obtained results revealed that bismuth is the element of the strongest impact on the castability changes. The formulated alloys surpass the commonly used standardized alloy intended for components of fittings, namely MO59, in terms of casting and mechanical (hardness) properties.
6
Content available Effect of T6 heat treatment on mechanical properties and microstructure of EN AB-42000 alloy modified with strontium
Pezda J.
Archives of Foundry Engineering
|
2011
|
Vol. 11, iss. 2 spec.
169--174
EN
Process of silumin properties perfection in scope of classic (simple and cheap) methods is connected with change of morphology of silumin precipitations through: process of alloy modification, maintaining suitable temperature of superheating treatment and pouring into moulds, as well as perfection of heat treatment operations. In the paper are presented results of a tests aimed at investigation of an effects of performed heat treatment operations on change of tensile strength of EN AC-42000 silumin modified with strontium. Investigated alloy was melted in electric resistance furnace. Course of crystallization process was recorded with use of thermal-derivative analysis (ATD), and on base of this analysis one determined temperatures range of heat treatment operations of the alloy. Performed heat treatment operation resulted in change of mechanical properties (Rm, A5) of the investigated alloy, whereas performed tests enabled determination of temperature and duration of solutioning and ageing treatments, which condition improvement of its mechanical properties.
7
Content available remote Selected problems of temperature measurement in welding processes
Słania J., Mikno Z., Wójcik M.
Advances in Manufacturing Science and Technology
|
2007
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Vol. 31, nr 3
83-93
EN
The issues of temperature measurements directly from a weld pool and a weld are discussed. Problems occurring while measuring with thermocouples are shown. The issues of thermal and derivative analysis are discussed. Thermal and derivative analysis applications to research into welding technology are reviewed.
PL
W pracy poddano analizie zagadnienia związane z pomiarem temperatury bezpośrednio w jeziorku spawalniczym i spoinie. Przedstawiono problemy pomiarów prowadzonych z wykorzystaniem termopar. Omówiono zagadnienia związane z analizą termiczną i derywacyjną. Dokonano przeglądu zastosowania analizy termicznej i derywacyjnej w badaniach z zakresu spawalnictwa.
8
Monitorowanie produkcji i kontrola jakości stopów odlewniczych za pomocą programów komputerowych
Pietrowski S. K., Gumienny G., Pisarek B. P., Władysiak R.
Odlewnictwo - Nauka i Praktyka
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2005
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R. 7, nr 3
3-18
PL
Przedstawiono możliwości monitorowania produkcji i kontroli jakości stopów odlewniczych za pomocą autorskich programów komputerowych. Zostały one opracowane dla stopów żelaza, miedzi i aluminium. W systemie komputerowym wykorzystano metodą analizy termicznej i derywacyjnej (ATD). Przedstawiono reprezentatywne krzywe ATD i mikrostrukturę różnych gatunków staliwa, żeliwa, brązu aluminiowo-niklowo-żelazowego i siluminu wieloskładnikowego. Pomiędzy ich charakterystycznymi wielkościami a składem chemicznym i właściwościami mechanicznymi stopu występują określone zależności statystyczne. Przykładowo podano j e dla żeliwa sferoidalnego gatunku EN-GJS-400-15. Stanowią one podstawę budowy algorytmu autorskich programów komputerowych monitorowania i kontroli jakości stopów. Zaprezentowano schemat procesu kontroli stopów oraz przykładowe ekrany programu komputerowego kontroli żeliwa sferoidalnego. Programy komputerowe wdrożono w odlewniach staliwa, żeliwa i siłuminów w ramach realizacji projektów celowych.
EN
In this paper fhe possibility of production monitoring and quality control of casting alloys with self-written computer programmes have been presented. They have been elaborated for ferrous, copper and aluminum alloys. In the computer system thermal derivative analysis (TDA) method have been used. In this paper representative TDA curves and microstructure of: cast steel, cast iron, aluminum-nickel-iron bronze and mulficomponent silumin have been shown. Among their characteristic volumes, chemical composition and mechanical properties of alloy there are statistic relationships. Exemplary relationships for EN-GJS-400-15 ductile cast iron have been given in this work. They are the basis of computer programmes algorithm of monitoring and quality control of alloys. In this paper the scheme of alloys control process and exemplary screen displays of computer programme of ductile cast iron control have been presented. Computer programmes have been implemented in cast iron, cast steel and silumin foundries during the realization of grants.
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