Wyniki wyszukiwania - BazTech

1

Analysis of Al-Mg casting alloys crystallization with use of ATND method

Ciućka T.

Advances in Manufacturing Science and Technology

|

2013

|

Vol. 37, nr 1

111—118

EN

The paper presents results of non-ferrous metals crystallization tests performed with use of the ATND method. Method of analysis of non-ferrous metals crystallization gives complete picture of arisen structural components of alloys. Particular structural components of alloys investigated with use of the ATND method were verified in x-ray microanalysis, what unequivocally confirmed their presence. Below are presented in graphical form (crystallization diagrams) results of crystallization process obtained from the ATND method. In crystallization diagrams of AG 10 and AG51 alloys are shown curves (thermal curve and its derivative, voltage curve and its derivative). Crystallizable individual structural components of the investigated alloys are reflected on curves of the method in form of characteristic peaks. The tests were performed with AG 10 and AG51 aluminum-magnesium casting alloys. Moreover, the paper presents structures of the investigated alloys with marked structural components identified with use of x-ray microanalysis.

PL

W pracy przedstawiono analizę wyników badań metodą ATND procesu krystalizacji stopów metali nieżelaznych. Analiza procesu krystalizacji tych stopów umożliwia charakterystykę powstających składników fazowych ich mikrostruktury. Składniki fazowe mikrostruktury badanych stopów określone metodą ATND zweryfikowano metodą mikroanalizy rentgenowskiej. Przedstawiono krzywe krystalizacji stopów magnezu AG10 i AG51 w zależności od temperatury i czasu, określono efekty cieplne i napięciowe. Ustalone wartości temperatury i napięcia użyto w obliczeniach matematycznych, w analizie regresji w celu określenia wartości temperatury krystalizacji składników fazowych badanych stopów. Wykonano badania mikroskopowe stopów AG10 i AG51.

2

Phase transformations and microstructure of IN-713C nickel superalloy

Binczyk F., Śleziona J.

Archives of Foundry Engineering

|

2009

|

Vol. 9, iss. 2

109-112

EN

The study presents the results of investigations of phase transformations taking place during melting and solidification and of microstructural examinations carried out on the family of IN 713C nickel superalloys. Examinations were carried out by the method of thermal analysis (ATD) and differential scanning calorimetry (DSC). It has been concluded that the method of thermal analysis (ATD) enables more precise assessment of the precipitation of the primary phases of a low value of the solidification enthalpy. The advantage of DSC is the possibility of determination of the value of the heat (enthalpy) of phase transformations during alloy melting and solidification. The measured parameters of Tlik and Tsol are comparable for both methods. Microstructural examinations have confirmed the phenomena accompanying phase transformations, i.e. the precipitation of primary carbides, the solidification of [...] phase matrix and carbide eutectic, and the formation of [...] phase in solid state.

3

ATD and DSC analyses of nickel superalloys

Binczyk F., Śleziona J., Cwajna J., Roskosz S.

Archives of Foundry Engineering

|

2008

|

Vol. 8, iss. 3s

5-8

EN

The study presents the results of investigations of phase transformations that take place during melting and solidification of nickel superalloys, like RENE 77, IN7 13C, MAR 247 and IN 100. Examinations were carried out by the ATD method of thermal analysis and DSC scanning calorimetry. It has been concluded that ATD offers wider possibilities for interpretation of the solidification process at its first stage, when from the liquid state the primary phases of a low heat of solidification are precipitating. The calorimetric method is more useful in the investigation of solid state phase transformations. The obtained values of the solidification parameters (Tlik and Tsol) are comparable for both methods, especially as regards alloys solidification. An undeniable advantage of the DSC method is the possibility to measure the value of the heat (enthalpy) of phase transformations, especially during melting of alloys.