What is it about?
Temperatures of phase transformations depend on the chemical composition of steel. It is extremely important to know at what temperature the structural changes occur in a material made of a particular steel grade. The paper presents the results of DSC thermal analysis studies, which can be used to find out what phase transition temperatures have been established for the B500SP steel grade (0.22% C, 0.79% Mn, 0.17% Si, 0.23% Cu, 0.08% Cr). Temperatures obtained experimentally were compared with theoretical values calculated in FactSage and using empirical equations
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Why is it important?
AC1S- the temperature of the beginning of the euthectoid transformation of perlite (mixture of ferrite and cementite) into austenite, AC1F - the temperature of the end of the transformation of perlite into austenite and AC3 - the temperature of the end of the transformation of ferrite into austenite, were elaborated during heating experiments. The influence of the heating rate and mass of the analyzed samples on the obtained results of phase transition temperatures is also presented. Decarburization of steel samples at low heating rates was discussed
Perspectives
It must be noted that due to the applied heating rate the transformation temperatures obtained in the DSC experiments should be treated as the upper limit of estimation of their corresponding equilibrium temperatures. In all cases the resulting temperatures are higher compared to the equilibrium temperature calculated for pseudo binary system in FactSage programme. In case of heat treatment processes which proceeds in no equilibrium conditions, the information about temperatures of phase transformation obtained experimentally should be more useful.
Tomasz Kargul
AGH University of Scien ce and Techbnology
Read the Original
This page is a summary of: Investigations of Temperatures of Phase Transformations of Low-Alloyed Reinforcing Steel within the Heat Treatment Temperature Range, Archives of Metallurgy and Materials, January 2017, De Gruyter,
DOI: 10.1515/amm-2017-0131.
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