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<p>In the present paper, a special process consisting of cold rolling and flash annealing was designed to improve the strength and elongation of Cu-containing antibacterial stainless steel, and the effects on microstructure and properties were systematically investigated. We determined that the microstructure of test steel after 75% cold rolling was mainly composed of high-density dislocation martensite, untransformed deformation austenite and deformation twins. After flash annealing, most of the untransformed deformation austenite transformed into large grains through recrystallization, and martensite with high-density dislocation transformed into small austenite grains. The bimodal size distribution with large and small grains and the high density of dislocations improved the mechanical properties of the test steel, that is, the yield strength was increased from 356&#xa0;MPa to 612&#xa0;MPa, and the tensile strength and uniform elongation reached 773&#xa0;MPa and 27.8%, respectively. Meanwhile, the combination of dense dislocation slip, twinning-induced plasticity (TWIP) effect and transformation-induced plasticity (TRIP) effect allowed the test steel to maintain an excellent work-hardening rate during deformation.</p>

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Strengthening Mechanism of Antibacterial Stainless Steel Based on Heterogeneous Nano/Ultrafine Austenite with High Dislocation Density

  • 期刊论文

  • 发表日期：

    2025年1月27日

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  • Jinqiang Mo,
  • Jianmin Li,
  • Mei Xu,
  • Wei Zhang,
  • Gang Niu,
  • Guanghong Feng,
  • Qihang Pang

摘要

In the present paper, a special process consisting of cold rolling and flash annealing was designed to improve the strength and elongation of Cu-containing antibacterial stainless steel, and the effects on microstructure and properties were systematically investigated. We determined that the microstructure of test steel after 75% cold rolling was mainly composed of high-density dislocation martensite, untransformed deformation austenite and deformation twins. After flash annealing, most of the untransformed deformation austenite transformed into large grains through recrystallization, and martensite with high-density dislocation transformed into small austenite grains. The bimodal size distribution with large and small grains and the high density of dislocations improved the mechanical properties of the test steel, that is, the yield strength was increased from 356 MPa to 612 MPa, and the tensile strength and uniform elongation reached 773 MPa and 27.8%, respectively. Meanwhile, the combination of dense dislocation slip, twinning-induced plasticity (TWIP) effect and transformation-induced plasticity (TRIP) effect allowed the test steel to maintain an excellent work-hardening rate during deformation.