Strain-induced formation of a gradient nanostructured surface layer on an ultrahigh strength bearing steel

查看全文 作　　者：[1,2]K.Zhang;[1]Z.B.Wang

机构地区：[1]Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences,Shenyang, 110016, China;[2]University of Chinese Academy of Sciences,Beijing, 100049, China

出　　处：《Journal of Materials Science & Technology》索引2018年第34卷第9期,共9页

基　　金：supported financially by the National Key Research and Development Program of China (No.2017YFA0204400);Shenyang National Laboratory for Materials Science(No. 2015RP04) 摘　　要：In the present work, an ultrahigh strength bearing steel(AISI 52100) was subjected to surface mechanical rolling treatment(SMRT) at room temperature. Microstructural observations showed that martensitic laths, twins and cementite particles in the initial microstructure underwent distinct plastic strains and were gradually refined into nanostructures. Consequently, a gradient nanostructured(GNS) surface layer with a mean grain size of ~24 nm at the top surface was obtained on the bearing steel, resulting in an increment of ~20% in the surface hardness. Analyses based on microstructural evolution, phase constitution and in-depth hardness distribution revealed a mechanically induced formation mechanism of the GNS surface layer. The multiple surface severe plastic deformation under fine lubrication and cooling during SMRT contributed to the formation of a thick hardened surface layer on the bearing steel. 关键词：坡度 nanostructured 超离频力量适用钢塑料变丑马氏体出现机械滚动处理

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Strain-induced formation of a gradient nanostructured surface layer on an ultrahigh strength bearing steel

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