热处理对高氮不锈钢的微观结构和力学性能的影响

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【Title】：Influence of hot working on microstructure and mechanical behavior of high nitrogen stainless steel
【Journal】journal of material science, 2011(46)
【Author】：Institute for Structural Materials, Central Iron and Steel Research Institute  Cheng-miao Hong • Jie Shi • Li-yuan Sheng, etc.
【Abstract】：The relationship between microstructures and mechanical properties of a high nitrogen stainless (HNS)
steel (0.65N–1.8Ni, wt%) manufactured by argon oxygen decarburization and continuous casting was investigated in
this article. The plates with different thicknesses were obtained by thermo-mechanical control process. The results
revealed that the plates prepared by hot rolled andsolution treated possessed good balanced mechanical properties,
i.e., satisfactory strength and higher toughness.Compared with hot-rolled and solution-treated plates, the hot-rolled
plate had much higher tensile strength, but its impact toughness was extremely low. Furthermore, with the increase
of deformation strain, the plate with finer grains, more precipitates and higher strength was achieved,but its
plasticity decreased obviously. The worm-like carbides formed along the grain boundary during the finish rollings
at 850 °C, which are detrimental to the toughness of hot-rolled plates. In addition, small amount of ferrite
precipitated in the steel due to the non-equilibrium solidification during continuous casting, and to ensure full
austenitic structure, composition design method was recommended.