MODELLING AND CHARACTERISATION OF BAINITE AND RETAINED AUSTENITE IN HOT ROLLED TRIP STEEL

1 SUWANPINIJ Piyada
Co-authors:
2 LI Xiaoxiao 2 PRAHL Ulrich 2 BLECK Wolfgang
Institutions:
1 The Sirindhorn International Thai-German Graduate School of Engineering (TGGS), King Mongkut's University of Technology North Bangkok (KMUTNB), Thailand, piyada.s.mme@tggs-bangkok.org
2 Department of Ferrous Metallurgy, RWTH Aachen University, Germany, EU
Conference:
25th Anniversary International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 25th - 27th 2016
Proceedings:
Proceedings 25th Anniversary International Conference on Metallurgy and Materials
Pages:
628-634
ISBN:
978-80-87294-67-3
ISSN:
2694-9296
Published:
14th December 2016
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
131 views / 39 downloads
Abstract

A hot rolled TRIP steel was selected for the laboratory scale process simulation. The ferrite and bainite transformation kinetics on the run out table and during coiling were mapped as a function of temperature and austenite conditioning by Leblond and Devaux’s concept. The updated carbon content in the remaining austenite is the key factor to control following bainite formation. The microstructure was characterized by LOM, SEM, FEG EPMA. The mean carbon content was taken from the in-situ high energy XRD. Proper process window or austenite conditioning can be predicted for the required fractions of phases. Enough carbon enrichment of austenite can be achieved by forming carbide free bainite alone without the formation of ferrite at higher temperature. However, its fraction can be too low to exhibit the TRIP effect. Therefore, pre-deformation such that in the hot rolling process is still necessary.

Keywords: Bainite, TRIP steel, modelling, characterisation

© 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