Influence of Ni and Process Parameters in Medium Mn Steels Heat Treated by High Partitioning Temperature Q&P Cycles |
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Authors: | Del Molino Eider Arribas Telleria Maribel Gilliams Casey Arlazarov Artem González Javier Jesús De Moor Emmanuel Speer John Gordon |
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Affiliation: | 1.Tecnalia, Basque Research and Technology Alliance (BRTA), Parque Científico y Tecnológico de Bizkaia, Astondo Bidea, 700, 48160, Derio, Spain ;2.Department of Mining and Metallurgical Engineering, University of the Basque Country (ETSI Bilbao UPV/EHU), Calle Alameda Urquijo s/n, 48013, Bilbao, Spain ;3.Advanced Steel Processing and Products Research Center, Colorado School of Mines, Golden, CO, 80401, USA ;4.ArcelorMittal Maizieres Research SA, Voie Romaine-BP30320, 57283, Maizières-lès-Metz, France ; |
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Abstract: | In this work, two medium Mn steels (5.8 and 5.7 wt pct Mn) were subjected to a quenching and partitioning (Q&P) treatment employing a partitioning temperature which corresponded to the start of austenite reverse transformation (ART). The influence of a 1.6 wt pct Ni addition in one of the steels and cycle parameters on austenite stability and mechanical properties was also studied. High contents of retained austenite were obtained in the lower quenching temperature (QT) condition, which at the same time resulted in a finer microstructure. The addition of Ni was effective in stabilizing higher contents of austenite. The partitioning of Mn and Ni from martensite into austenite was observed by TEM–EDS. The partitioning behaviour of Mn depended on the QT condition. The lower QT condition facilitated Mn enrichment of austenite laths during partitioning and stabilization of a higher content of austenite. The medium Mn steel containing Ni showed outstanding values of the product of tensile strength (TS) and total elongation (TEL) in the lower QT condition and a higher mechanical stability of the austenite. |
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