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Austenite Reversion Tempering-Annealing of 4 wt.% Manganese Steels for Automotive Forging Application

Authors :
Alexander Gramlich
Robin Emmrich
Wolfgang Bleck
Source :
Metals, Vol 9, Iss 5, p 575 (2019)
Publication Year :
2019
Publisher :
MDPI AG, 2019.

Abstract

New medium Mn steels for forged components, in combination with a new heat treatment, are presented. This new annealing process implies air-cooling after forging and austenite reversion tempering (AC + ART). This leads to energy saving compared to other heat treatments, like quenching and tempering (Q + T) or quenching and partitioning (Q + P). Furthermore, the temperature control of AC + ART is easy, which increases the applicability to forged products with large diameters. Laboratory melts distinguished by Ti, B, Mo contents have been casted and consecutively forged into semi-finished products. Mechanical properties and microstructure have been characterized for the AC and the AC + ART states. The as forged-state shows YS from 900 MPa to 1000 MPa, UTS from 1350 MPa to 1500 MPa and impact toughness from 15 J to 25 J. Through the formation of nanostructured retained metastable austenite an increase in impact toughness was achieved with values from 80 J to 100 J dependent on the chemical composition.

Details

Language :
English
ISSN :
20754701
Volume :
9
Issue :
5
Database :
Directory of Open Access Journals
Journal :
Metals
Publication Type :
Academic Journal
Accession number :
edsdoj.118b4cdbdfee4899b9995042f03f7138
Document Type :
article
Full Text :
https://doi.org/10.3390/met9050575