文献类型：期刊文献

英文题名：The effect of nanostructured surface layer on the fatigue behaviors of a carbon steel

作者：Li, D.[1];Chen, H. N.[2];Xu, H.[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China

年份：2009

卷号：255

期号：6

起止页码：3811

外文期刊名：APPLIED SURFACE SCIENCE

收录：;EI(收录号：20090111825966);WOS:【SCI-EXPANDED(收录号:WOS:000261972100059)】；

语种：英文

外文关键词：Surface mechanical attrition treatment; Carbon steel; Nanostructured surface layer; Fatigue behavior

摘要：A nanostructured surface layer was formed on a carbon steel by means of surface mechanical attrition treatment (SMAT). The microstructure of the surface layer of the SMATed sample was characterized by using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Microhardness and residual stress distribution along the depth from the SMATed surface layer were measured at the same time. Fatigue behaviors of the carbon steel subjected to the SMAT process were investigated. A nanostructured layer with average grains size of similar to 12.7 nm was formed, of which microhardness is more than twice as high as that in matrix and residual compressive stress can reach about -400 MPa with maximum depth of similar to 600 mm. The fatigue strength of as-received sample is 267 MPa and that of SMATed sample is 302 MPa based on fatigue life 5 x 10(6) cycles. The SMAT process has improved the fatigue strength by as much as 13.1% for the carbon steel. It is shown that the SMAT is an effective method to render the material with the features, such as a nanostructured and work-hardened surface layer as well as compressive residual stresses, which can pronouncedly improve the fatigue strength of the carbon steel. (c) 2008 Elsevier B.V. All rights reserved.