ALTERNATIVE HEAT TREATMENT OF MNSI STEELS BY INTERCRITICAL ANNEALING AND QUENCHING AND PARTITIONING PROCESS

1 BUBLÍKOVÁ Dagmar
Co-authors:
1 VOREL Ivan 1 JIRKOVÁ Hana 1 MAŠEK Bohuslav
Institution:
1 University of West Bohemia, RTI – Regional Technological Institute, Pilsen, Czech Republic, EU, dagmar.bublikova@seznam.cz
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:
664-669
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:
75 views / 20 downloads
Abstract

Today, advanced steels which are used in the automotive industry are required to possess high strength and ductility. Two heat treatment methods capable of meeting these requirements were tried in the present experimental programme that involved selected types of steels. These methods were the Q-P process (Quenching and Partitioning) and intercritical bainitic annealing. Favourable elongation levels combined with high ultimate strengths were obtained by stabilizing the retained austenite in the microstructure. The Q-P process, which can produce mixtures of martensite and a certain amount of retained austenite, led to strengths above 2000 MPa and elongation levels of 10-15 %. The intercritical annealing, which results in combinations of bainite, ferrite and retained austenite, provided strengths of up to 2000 MPa and elongation levels up to 25 %.

Keywords: Q-P process, intercritical annealing, retained austenite, AHSS

© 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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