4.7 Article

Prominent work hardening and ultrahigh yield strength both realized in 3Mn steel multiply alloyed with Cu/Ni/Al/V

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2022.143473

Keywords

Mn alloyed steel; Multiple precipitations; Ageing; Retained austenite; Tensile properties

Funding

  1. National Natural Science Foundation of China [51904028]
  2. Fundamental Research Funds for the Central Universities of China [06600019, 06500151]

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In this study, a 3 wt% Mn contained, and Cu-Ni-Al-V alloyed steel was developed, in which various precipitations and metastable austenite phase were formed. The choice of intercritical annealing temperature was found to significantly affect the tensile properties of the material. An intermediate annealing temperature of 700℃ resulted in the best mechanical combination.
In this paper, we developed a 3 wt% Mn contained, and Cu-Ni-Al-V alloyed steel, in which several types of precipitations and metastable austenite phase were both formed via the intercritical annealing (IA) at 670-750 ? and the ageing at 500 ?. It was found that the choice of IA temperature had the critical influence on the resultant tensile properties. An intermediate IA temperature of 700 ? produced the best mechanical combination, i.e. yielding at the ultrahigh stress of 1320 MPa followed by a prominent work hardening increment of 334 MPa over 26% tensile strain, which is superior to the tensile properties of similarly alloyed medium Mn steels. This is because the multiple precipitations contribute to ultrahigh yield strength; and the formed bimodally-sized retained austenite (RA) grains, resulting from a remarkable reverse transformation occurring during the ageing, provide the sustainable transformation-induced-plasticity (TRIP) effect for enhanced work hardening. Therefore, we propose that the multiple precipitations and bimodally sized RA grains could be a new microstructural design strategy for the simultaneous improvement of both yield strength and work hardening capacity.

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