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

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...

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Veröffentlicht in:Metals (Basel ) 2019-05, Vol.9 (5), p.575
Hauptverfasser: Gramlich, Alexander, Emmrich, Robin, Bleck, Wolfgang
Format: Artikel
Sprache:eng
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Zusammenfassung: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.
ISSN:2075-4701
2075-4701
DOI:10.3390/met9050575