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研究了一种包含有多尺度微结构的高MnN低Ni超级双相不锈钢25Cr-2Ni-3Mo-10Mn-0.5N经过冷轧和退火后,多尺度晶粒度对点腐蚀和力学性能的影响。结果表明:多尺度微结构与退火时间密切相关,在1050oC,奥氏体与铁素体平均晶粒大小随着时效时间的增加而增加,时效1min后,奥氏体和铁素体的晶粒大小分别为1.5和7.18μm。随着多尺度晶粒的长大,样品的抗拉强度,屈服强度和断面收缩率下降,而样品的耐腐蚀性能增强。多尺度微结构对该双相钢25Cr-2Ni-3Mo-10Mn-0.5N的点腐蚀性能和力学性能起着重要作用。
The effect of multi-scale grain size on pitting and mechanical properties of a high MnN low Ni super duplex stainless steel 25Cr-2Ni-3Mo-10Mn-0.5N containing multi-scale microstructures after cold rolling and annealing was investigated. The results show that the multi-scale microstructure is closely related to the annealing time. At 1050oC, the average grain size of austenite and ferrite increases with the aging time. After 1min aging, the grain size of austenite and ferrite The sizes are 1.5 and 7.18 μm, respectively. With the growth of multi-scale grains, the tensile strength, yield strength and reduction of area decreased, while the corrosion resistance of samples increased. The multi-scale microstructure plays an important role in the pitting corrosion and mechanical properties of the dual-phase steel 25Cr-2Ni-3Mo-10Mn-0.5N.