表面纳米化对316L不锈钢性能的影响  

Effects of surface nanocrystallization on the properties of 316L stainless steel

作　　者：吕爱强[1] 张洋[1] 李瑛[2] 刘刚[3] 刘春明[1] 

机构地区：[1]东北大学 [2]中国科学院金属研究所金属腐蚀与防护国家重点实验室 [3]中国科学院金属研究所沈阳材料科学国家(联合)实验室

出　　处：《材料研究学报》2005年第2期118-124,共7页Chinese Journal of Materials Research

基　　金：教育部跨世纪人才基金国家自然科学基金面上资助项目50001013~~

摘　　要：对316L不锈钢进行表面机械研磨处理(SMAT),研究表面组织变化对其硬度和在0.5 mol/L NaCl介质中腐蚀性能的影响。结果表明:通过SMAT可以在316L不锈钢表面制备出纳米结构层,随着处理时间的增加,表面纳米晶组织逐渐由单一的奥氏体相过渡到奥氏体与马氏体两相共存;表面纳米化和马氏体相变能够明显地提高316L不锈钢的表层硬度,使表面粗糙度略有下降;表面机械研磨处理降低了316L不锈钢在0.5mol/L NaCl腐蚀介质中的耐蚀性能.因为316L不锈钢表面纳米晶组织容易钝化, 形成的钝化膜不稳定,提高了溶解速度.Surface nanocrystallization of 316L stainless steel was realized by using surface mechanical attrition treatment (SMAT). During SMAT the microstructural evolution, the changes of hardness and corrosion properties in 0.5 mol/L NaCl solution were analyzed. Experimental results show that partial austenite nanocrystallines transformed gradually to martensite with the increment of the treatment duration. The nanocrystallization of surface layer and the martensite phase can effectively enhance the surface hardness and slightly reduce the surface-roughness. In 0.5 mol/L NaCl solution, the surface of the treated 316L stainless steel is liable to be passivated due to the formation of the nanos-tructured surface layer, however the passive films are instable and dissoluble. The corrosion resistance of the SMAT sample is lower than that of the original coarse-grained sample.

关 键 词：金属材料 表面机械研磨 316L不锈钢 硬度 表面粗糙度 腐蚀性能 

分 类 号：TG115[金属学及工艺—物理冶金]