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

Steel Institute of RWTH Aachen University, 52072 Aachen, Germany
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Metals 2019, 9(5), 575; https://doi.org/10.3390/met9050575
Received: 25 April 2019 / Revised: 10 May 2019 / Accepted: 14 May 2019 / Published: 17 May 2019
(This article belongs to the Special Issue Physical Metallurgy of High Manganese Steels)
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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. View Full-Text
Keywords: medium-manganese; forging; austenite reversion; mechanical properties; microstructure medium-manganese; forging; austenite reversion; mechanical properties; microstructure
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Gramlich, A.; Emmrich, R.; Bleck, W. Austenite Reversion Tempering-Annealing of 4 wt.% Manganese Steels for Automotive Forging Application. Metals 2019, 9, 575.

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