THE EFFECT OF ALLOYING ELEMENTS ON THE TEMPERATURE RANGE OF PEARLITE TO AUSTENITE TRANSFORMATION IN LOW ALLOY HYPOEUTECTOID STEELS

1 PAWŁOWSKI Bogdan
Co-authors:
1,2 BAŁA Piotr 1 DZIURKA Rafał
Institutions:
1 AGH University of Science and Technology, Faculty of Metals Engineering and Industrial Computer Science, Cracow, Poland, EU
2 AGH University of Science and Technology, Academic Centre of Materials and Nanotechnology, Cracow, Poland, EU
Conference:
24th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, June 3rd - 5th 2015
Proceedings:
Proceedings 24th International Conference on Metallurgy and Materials
Pages:
822-826
ISBN:
978-80-87294-58-1
ISSN:
2694-9296
Published:
12th January 2015
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
136 views / 29 downloads
Abstract

The formation of austenite above A1 temperature plays very important role in the heat treatment of hypo-eutectoid steels, especially automotive DP steels. It is widely accepted that the formation of austenite during intercritical annealing takes place in three stages: 1 – very rapid pearlite to austenite transformation, 2 – slower growth of austenite into ferrite, 3 – slow final equilibrium of ferrite and austenite. According to the literature data, important factors that influence the phase transformation kinetics are the cementite morphology, the grain size and the heating rate. In this work, experimental results of dilatometric examinations of low alloy normalized hypo-eutectoid steels show that during heating at the same rate, temperature range of pearlite to austenite transformation strongly depends on the amount of alloying elements and whether they are ferrite or austenite stabilizers. ThermoCalc and DICTRA computational tools were also used to calculate the eutectoid regions of the equilibrium phase diagrams for some low alloy steels.

Keywords: hypo-eutectoid steels, phase transformation, pearlite, austenite, critical temperatures

© 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.

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