EFFECT OF MANGANESE DURING THE STABILIZATION OF AUSTENITE IN QUENCH AND PARTITIONING (Q&P) STEELS

1 CARPIO Marcel
Co-authors:
1 MUÑOZ Jessica 2 GARCÍA Omar 1 CABRERA José Mara 2 PEDRAZA Juan Pablo
Institutions:
1 Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica, EEBE, Universitat Politècnica de Catalunya, Campus Diagonal Besòs, Av. Eduard Maristany 16, 08019, Barcelona, Spain, marcel.francisco.carpio@upc.edu
2 TERNIUM México, Av. Universidad 992 Nte., Col. Cuauhtémoc, 66450, San Nicolás de los Garza, Nuevo León, México
Conference:
28th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 22nd - 24th 2019
Proceedings:
Proceedings 28th International Conference on Metallurgy and Materials
Pages:
514-519
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
38 views / 10 downloads
Abstract

Nowadays, automobile emissions are one of the leading causes of air contamination. In this regard, the weight reduction of the vehicles structures and parts is vital, while the passenger’s safety is the first issue. Therefore, high demand for Advanced High Strength Steels (AHSS), is constantly increasing in the automotive industry, which can adequately fulfill both safety and emissions issues through reduction in thickness. A new generation of AHSS covers these demands owing to excellent forming and mechanical properties. Accordingly, Quenching and Partitioning (Q&P) steels have been developed with a special microstructure composed of an initial fraction of martensite and a slight fraction of stabilized retained austenite. The aim of the present work is to assess the effect of different amounts of manganese in Q&P steel under various heat treatment cycles relevant to an industrial process. A 0.2C-1.5Si base steel with different amount of Mn, namely 1.5, 3.5 and 5.5 (in wt%) were selected to promote different amounts of retained austenite after Q&P process. In order to determine the critical transformation temperatures such as Ac1, Ac3, Ms and Mf, which are needed to design Q&P thermal cycles, dilatometric experiments were carried out. The results are presented according to the chemical composition, the final microstructure and the hardness obtained in each condition.

Keywords: Quenching and Partitioning, high manganese, retained austenite
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