Cu-assisted austenite reversion and enhanced TRIP effect in maraging stainless steels

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

6 Scopus Citations
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Author(s)

  • M.C. Niu
  • K. Yang
  • J.H. Luan
  • W. Wang
  • Z.B. Jiao

Detail(s)

Original languageEnglish
Pages (from-to)52-58
Journal / PublicationJournal of Materials Science and Technology
Volume104
Online published8 Sep 2021
Publication statusPublished - 30 Mar 2022

Abstract

Control of the formation and stability of reverted austenite is critical in achieving a favorable combination of strength, ductility, and toughness in high-strength steels. In this work, the effects of Cu precipitation on the austenite reversion and mechanical properties of maraging stainless steels were investigated by atom probe tomography, transmission electron microscopy, and mechanical tests. Our results indicate that Cu accelerates the austenite reversion kinetics in two manners: first, Cu, as an austenite stabilizer, increases the equilibrium austenite fraction and hence enhances the chemical driving force for the austenite formation, and second, Cu-rich nanoprecipitates promote the austenite reversion by serving as heterogeneous nucleation sites and providing Ni-enriched chemical conditions through interfacial segregation. In addition, the Cu precipitation hardening compensates the strength drop induced by the formation of soft reverted austenite. During tensile deformation, the metastable reverted austenite transforms to martensite, which substantially improves the ductility and toughness through a transformation-induced plasticity (TRIP) effect. The Cu-added maraging stainless steel exhibits a superior combination of a yield strength of ∼1.3 GPa, an elongation of ∼15%, and an impact toughness of ∼58 J.

Research Area(s)

  • Austenite reversion, Cu-rich nanoprecipitate, Maraging stainless steel, TRIP effect

Citation Format(s)

Cu-assisted austenite reversion and enhanced TRIP effect in maraging stainless steels. / Niu, M.C.; Yang, K.; Luan, J.H.; Wang, W.; Jiao, Z.B.

In: Journal of Materials Science and Technology, Vol. 104, 30.03.2022, p. 52-58.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review