摘要
以一种含氮量达1．0%(质量分数)的高氮奥氏体不锈钢N10和316L不锈钢为研究对象,通过在室温下对这两种材料施加不同的压缩变形量,研究了两种材料变形后的显微组织、真应力-真应变曲线和显微硬度．结果表明,两种材料在冷变形量小于20%时,机械孪晶和滑移共同参与变形．随变形量增加至50%,316L的变形方式过渡到以滑移为主,而高氮钢中机械孪晶和滑移仍共同参与变形．高氮奥氏体不锈钢在变形过程中不发生马氏体相变,表明其具有较高的结构稳定性；而316L中有马区体形成．高氮不锈钢的固溶态强度、硬度和加工硬化系数均显著高于316L,冷变形可大幅提高两种材料的强度．两种材料的显微硬度均与晶粒取向有明显相关性,晶粒取向对显微硬度的影响大于变形不均匀性的影响．对高氮不锈钢表现出的优民性能的机制进行了分析和讨论．
The microstructures, true stress-true strain curves and micro-hardness of two stainless steels, containing 1.0%N（N10） and 316L, after compressive deformation were measured. It was found that the mechanical twinning and sliping participated together in the deformation for the two steels under the deformation less than 20%, but sliping turned to be dominant for 316L when the deformation was increased to 50%, the high nitrogen steel N10 still remained the above two mechanisms. There was no α＇ martensite transformation in the steel N10 under deformation, showing better structure stability, but martensite appeared in the 316L. The strength, microhardness and work-hardening effect of the steel N10 were much higher than those of the 316L, while the strengths could be largely enhanced by cold deformation for the two steels. The microhardness was related to the grain orientation for the two steels and the effect of grain orientation was larger than that of the microstructure inhomogeneity. The reason why the high nitrogen stainless steel has the excellent property was also discussed.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第2期171-176,共6页
Acta Metallurgica Sinica
基金
国家自然科学基金50534010~~
关键词
高氮奥氏体不锈钢
316L不锈钢
冷变形
high nitrogen austenitic stainless steel, 316L stainless steel, cold deformation
