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Volume 24 Issue 5
May  2017
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文章导航 >  矿物冶金与材料学报（英文）  > 2017  >  24(5): 530-537
Hui-bin Wu, Gang Niu, Feng-juan Wu, and Di Tang, Reverse-transformation austenite structure control with micro/nanometer size, Int. J. Miner. Metall. Mater., 24(2017), No. 5, pp. 530-537. https://doi.org/10.1007/s12613-017-1434-1
Cite this article as:
Hui-bin Wu, Gang Niu, Feng-juan Wu, and Di Tang, Reverse-transformation austenite structure control with micro/nanometer size, Int. J. Miner. Metall. Mater., 24(2017), No. 5, pp. 530-537. https://doi.org/10.1007/s12613-017-1434-1
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研究论文Open Access

Reverse-transformation austenite structure control with micro/nanometer size

  • Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China

  • Beijing Engineering Technology Research Center of Special Steel for Traffic and Energy, Beijing 100083, China

  • 通讯作者:

    Gang Niu    E-mail: ustbning@163.com

  • To control the reverse-transformation austenite structure through manipulation of the micro/nanometer grain structure, the influences of cold deformation and annealing parameters on the microstructure evolution and mechanical properties of 316L austenitic stainless steel were investigated. The samples were first cold-rolled, and then samples deformed to different extents were annealed at different temperatures. The microstructure evolutions were analyzed by optical microscopy, scanning electron microscopy (SEM), magnetic measurements, and X-ray diffraction (XRD); the mechanical properties are also determined by tensile tests. The results showed that the fraction of stain-induced martensite was approximately 72% in the 90% cold-rolled steel. The micro/nanometric microstructure was obtained after reversion annealing at 820-870℃ for 60 s. Nearly 100% reversed austenite was obtained in samples annealed at 850℃, where grains with a diameter ≤ 500 nm accounted for 30% and those with a diameter >0.5 μm accounted for 70%. The micro/nanometer-grain steel exhibited not only a high strength level (approximately 959 MPa) but also a desirable elongation of approximately 45%.
    • Research ArticleOpen Access

    Reverse-transformation austenite structure control with micro/nanometer size

    + Author Affiliations
      Abstract
    • To control the reverse-transformation austenite structure through manipulation of the micro/nanometer grain structure, the influences of cold deformation and annealing parameters on the microstructure evolution and mechanical properties of 316L austenitic stainless steel were investigated. The samples were first cold-rolled, and then samples deformed to different extents were annealed at different temperatures. The microstructure evolutions were analyzed by optical microscopy, scanning electron microscopy (SEM), magnetic measurements, and X-ray diffraction (XRD); the mechanical properties are also determined by tensile tests. The results showed that the fraction of stain-induced martensite was approximately 72% in the 90% cold-rolled steel. The micro/nanometric microstructure was obtained after reversion annealing at 820-870℃ for 60 s. Nearly 100% reversed austenite was obtained in samples annealed at 850℃, where grains with a diameter ≤ 500 nm accounted for 30% and those with a diameter >0.5 μm accounted for 70%. The micro/nanometer-grain steel exhibited not only a high strength level (approximately 959 MPa) but also a desirable elongation of approximately 45%.
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