A novel Cu-Ni added medium Mn steel: Precipitation of Cu-rich particles and austenite reversed transformation occurring simultaneously during ART annealing

Two elements, Cu and Ni, were deliberately added into a typical medium Mn steel during smelting for further improving mechanical properties through the precipitation of Cu particles simultaneously with austenite reversed transformation

Shu Yan; Taosha Liang; Jingqi Chen; Tianle Li; Xianghua Liu

2019

Scholarcy highlights

  • Two elements, Cu and Ni, were deliberately added into a typical medium Mn steel during smelting for further improving mechanical properties through the precipitation of Cu particles simultaneously with austenite reversed transformation
  • The feasibility that Cu-rich particles precipitate within recrystallized ferritic grains or tempered martensitic laths during ART annealing is proved, and the size of Cu-rich particles are nano-scaled, of which the diameter is less than 20 nm
  • The addition of Cu and Ni enables a significant increase of tensile strength, about 90–150 MPa while do not improve the yield strength, and results in the deterioration of tensile ductility
  • It is confirmed that at high stain rates medium Mn steels still have an outstanding comprehensive properties

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