Characterization of a Medium Mn-Ni Steel Q&P Treated by a High Partitioning Temperature Cycle

Maribel Arribas*, Eider Del Molino, Teresa Gutiérrez, Artem Arlazarov, David Martin, Daniele De Caro, S. Ayenampudi, Maria Jesus Santofimia

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

In this work, a medium Mn-Ni steel was treated through Quenching and Partitioning (Q&P) with a partitioning temperature (PT) of 650 °C, which corresponded to the start of the austenite reverse transformation (ART) phenomenon. The influence of the quenching temperature (QT) and partitioning time (Pt) on austenite stabilization and mechanical properties was investigated. A strong influence of the quenching temperature was observed. Results were compared with those obtained after a Q&P treatment with 400 °C partitioning temperature. The Q&P cycle with quenching to room temperature and a high partitioning temperature produced a steel with a high retained austenite (RA) volume fraction and exceptional strength–ductility balance. The analysis of the mechanical stability of the retained austenite revealed a significant stress-induced transformation. Nevertheless, the austenite, which was stable at stresses above the yield stress, provided significant TRIP-assisted ductility. Bending, hole expansion and post-stamping properties were also evaluated for the most promising conditions.
Original languageEnglish
Article number483
Number of pages29
JournalMetals
Volume12
Issue number3
DOIs
Publication statusPublished - 2022

Keywords

  • quenching and partitioning
  • medium Mn steels
  • austenite reverse transformation
  • austenite stability

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