DETERMINATION OF PHASE TRANSFORMATION TEMPERATURES OF 20MNCR5 STEEL USING COMPUTHERM THERMODYNAMIC DATABASE AND DESIGN OF REGRESSION EQUATIONS

1 CHUDOBOVÁ Lucie
Co-authors:
1 TKADLEČKOVÁ Markéta 2 CIBULKA Jiří 1 STROUHALOVÁ Michaela 1 MICHALEK Karel 1 WALEK Josef 1 SNIEGOŇ Michal 3 MERDER Tomasz
Institutions:
1 VSB - Technical University of Ostrava, Ostrava, Czech Republic, EU, lucie.chudobova@vsb.cz, marketa.tkadleckova@vsb.cz, michaela.strouhalova@vsb.cz, karel.michalek@vsb.cz, josef.walek@vsb.cz, michal.sniegon@vsb.cz
2 TŘINECKÉ ŽELEZÁRNY, a.s., Třinec, Czech Republic, EU, Jiri.Cibulka@trz.cz
3 Politechnika Slaska, Katowice, Poland, EU, Tomasz.Merder@polsl.pl
Conference:
30th Anniversary International Conference on Metallurgy and Materials, Brno, Czech Republic, EU, May 26 - 28, 2021
Proceedings:
Proceedings 30th Anniversary International Conference on Metallurgy and Materials
Pages:
40-45
ISBN:
978-80-87294-99-4
ISSN:
2694-9296
Published:
15th September 2021
Proceedings of the conference have been sent to Web of Science and Scopus for evaluation and potential indexing.
Metrics:
30 views / 15 downloads
Abstract

The paper presents analysis of phase transformation temperatures of 20MnCr5 steel. For calculations of required temperatures, i.e. liquidus temperature (TL) and solidus temperature (TS) was used CompuTherm thermodynamic database. The aim of this paper was the use calculated temperatures from CompuTherm thermodynamic database to design regression equations for calculation of the phase transformation temperatures. From the results it is obvious that in the calculation of individual temperatures, the chemical composition has a significant effect on changes of the values of given temperatures. The resulting temperatures also vary depending on the used calculation method (the Lever method proved to be the most suitable). The mean value of liquidus temperature is 1,508 °C and the solidus temperature is 1,462 °C (using CompuTherm and the Lever method). The range of the two-phase zone region for the average content of elements within the limits of 20MnCr5 steel grade is thus 46 °C. Furthermore, the resulting regression equations are given in the work, determined by regression analysis of 66 possible variants of chemical composition of steel 20MnCr5 phase transformation temperatures calculated for defined chemical compositions by thermodynamic database CompuTherm. These equations can be used in operational conditions for calculations of phase transformations in the limit values of the used chemical composition of a given steel grade. When using a different range of chemical composition, these equations can be used, but without guaranteed results.

Keywords: Steel, phases, transformation, liquidus temperature, solidus temperature

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Scroll to Top