超声纳米表面改性对316L不锈钢耐磨性能的影响  

Effect of Ultrasonic Nanocrystal Surface Modification on Wear Property of 316L Stainless Steel

作　　者：李阳[1] 李净凯 邹云[1] 刘书豪[1] 李大磊[1] LI Yang;LI Jingkai;ZOU Yun;LIU Shuhao;LI Dalei(School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, China)

机构地区：[1]郑州大学机械与动力工程学院,河南郑州450001

出　　处：《郑州大学学报（工学版）》2021年第6期49-54,共6页Journal of Zhengzhou University（Engineering Science）

基　　金：国家自然科学基金资助项目(51801185);河南省重点研发与推广专项(182102210009);河南省高等学校重点科研项目(19A460007)。

摘　　要：为了改善316L奥氏体不锈钢的耐磨性能,采用超声纳米表面改性(UNSM)方法,在材料表面制备梯度纳米结构(GNS)表层。利用硬度计、微纳米力学测试系统、高速X-射线残余应力分析仪和扫描电镜等对试样表层的硬度、残余应力和显微组织进行表征,研究了不同层深梯度纳米结构表层的耐磨性能。结果表明:经过UNSM处理后,316L不锈钢的表面存在晶粒细化;梯度纳米结构表层的厚度随着UNSM处理次数的增加而增加;与未处理样品相比,UNSM处理4次后,试样表面残余应力从-413 MPa达到-1193 MPa,表面显微硬度从306 HV_(0.2)增加到405 HV_(0.2);UNSM处理3次时样品摩擦系数最小。研究表明,超声纳米表面改性能显著改善316L不锈钢的表面性能,降低摩擦系数。In order to improve the wear resistance of 316L austenitic stainless steel,a gradient nanostructured(GNS)surface layer was formed by ultrasonic nanocrystal surface modification(UNSM)method.The microhardness,residual stress and microstructure of the sample surface were studied by microhardness tester,nanoindentation tester,X-ray residual stress analyzer and scanning electron microscopy.And the wear resistance of gradient nanostructured surface layers with different depth was studied.The results showed that grain refinement existed on the surface of 316L stainless steel after UNSM treatment and the thickness of gradient nanostructure layer increased with the increase of treatment times.Compared to the untreated samples,the surface residual compressive stress increased from-413 MPa to-1193 MPa,the surface microhardness increased from 306 HV_(0.2) to 405 HV_(0.2),and the friction coefficient was the least when the UNSM was treated three times.The results showed that the surface properties of 316L stainless steel were significantly improved by ultrasonic nano-surface modification,and the friction coefficient was reduced.

关 键 词：316L不锈钢 超声纳米表面改性 残余应力 耐磨性能 

分 类 号：TG506.71[金属学及工艺—金属切削加工及机床]