Mechanical properties and deformation mechanisms of a novel austenite-martensite dual phase steel

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

12 Scopus Citations
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Author(s)

  • S.S. Xu
  • J.P. Li
  • Y. Cui
  • Y. Zhang
  • L.X. Sun
  • J. Li
  • J.H. Luan
  • Z.B. Jiao
  • Z.W. Zhang

Detail(s)

Original languageEnglish
Article numberUNSP 102677
Number of pages13
Journal / PublicationInternational Journal of Plasticity
Volume128
Online published23 Jan 2020
Publication statusPublished - May 2020

Abstract

A novel austenite-martensite dual-phase steel with a ductility of ∼30% and tensile strength over 1.4 GPa was developed. The hard martensite in the dual phase steel was strengthened through precipitation strengthening by Cu/NiAl precipitates, forming the maraging phase. The deformation mechanisms of the steel were investigated using in situ neutron diffraction and transmission electron microscopy (TEM). The results indicate that the maraging phase constrains the deformation of soft austenite, forming a strong skeleton frame with the soft austenite involved in the frame. The yield strength was controlled by the deformation of hard maraging phase, leading to the high strength of the steel. The plasticity of the maraging phase was improved through the synchronously deformation and rotation of martensite grains along with the frame-structure effect. During deformation of the maraging phase, the transfer of the dynamic stress and strain from the hard phase to a soft one compels the cooperative deformation of the soft phase together with the hard phase. This deformation contributes further to the ductility through the -plasticity (TRIP) effects of the soft austenite. Furthermore, the cooperative deformation and the dynamic stress/strain partitions can effectively suppress the strain localization at the phase interface, retarding the crack initiation.

Research Area(s)

  • Deformation mechanisms, Mechanical properties, Martensite-austenite dual-phase steel, In situ neutron diffraction, Atom probe tomography

Citation Format(s)

Mechanical properties and deformation mechanisms of a novel austenite-martensite dual phase steel. / Xu, S.S.; Li, J.P.; Cui, Y.; Zhang, Y.; Sun, L.X.; Li, J.; Luan, J.H.; Jiao, Z.B.; Wang, X.-L.; Liu, C.T.; Zhang, Z.W.

In: International Journal of Plasticity, Vol. 128, UNSP 102677, 05.2020.

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