Reverse-transformation austenite structure control with micro/nanometer size
来源期刊：International Journal of Minerals Metallurgy and Materials2017年第5期
论文作者：Hui-bin Wu Gang Niu Di Tang
文章页码：530 - 537
摘 要：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 316 L 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°C for 60 s.Nearly 100% reversed austenite was obtained in samples annealed at 850°C,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%.
Hui-bin Wu1,2，Gang Niu1,2，Di Tang1,2
1. Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing
摘 要：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 316 L 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°C for 60 s.Nearly 100% reversed austenite was obtained in samples annealed at 850°C,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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