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1050℃,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1 min后,奥氏体和铁素体的晶粒大小分别为1.5和7.18 μm.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.
A high-Mn-N low-Ni superduplex stainless steel 25Cr-2Ni-3Mo-10Mn-0.5N with multi-scale microstructures has been prepared through severe cold rolling and annealing,and the effects of multi-scale grains on the pitting corrosion and mechanical properties have been investigated.The results show that the multi-scale microstructures have a strong relation with the annealing time,that is,the average grain sizes of austenite and ferrite increase with prolonging of the annealing time at 1050 ℃,they have the minimum values of 1.5 and 7.18 μm,respectively,when the alloy is annealed for 1 min.The tensile strength,yield strength and reduction in area of the sample decrease with the growth of multi-scale grains,whereas the pitting corrosion resistance of the specimen is enhanced.The multi-scale microstructures play an important role on the pitting corrosion and the mechanical properties of superduplex stainless steel 25Cr-2Ni-3Mo-10Mn-0.5N.
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