Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 53, Issue 11, Pages 3937-3955Publisher
SPRINGER
DOI: 10.1007/s11661-022-06796-x
Keywords
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Funding
- European Commission in the HIGHQP Project - Research Fund for Coal and Steel [709855]
- Advanced Steel Processing and Products Research Center
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In this study, two medium Mn steels were treated with a quenching and partitioning process to obtain high contents of retained austenite. The addition of Ni effectively stabilized the austenite content. The distribution of Mn and Ni from martensite to austenite was observed. Lower quenching temperature conditions facilitated the enrichment of Mn in the austenite during partitioning.
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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