Formation of nanostructured surface layer on AISI 304 stainless steel by means of surface mechanical attrition treatment
Formation of nanostructured surface layer on AISI 304 stainless steel by means of surface mechanical attrition treatment
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DOI：
10.1016/s1359-6454(02)00594-3
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发表时间：
2003-04-18
期刊：
影响因子：
9.4
通讯作者：
Lu, K
中科院分区：
文献类型：
--
作者：
Zhang, HW;Hei, ZK;Lu, K
通过表面机械损耗处理（SMAT），在AISI 304不锈钢上形成纳米结构的表面层。通过使用X射线衍射（XRD），扫描电子显微镜（SEM）和透射电子显微镜（TEM）和横截面TEM观察来揭示变形驱动的驱动驱动的，通过使用X射线衍射（XRD），扫描电子显微镜（SEM）和透射式电子显微镜（SEM）来表征拟声样品的表面层的微观结构。 F.C.C.的谷物细化机制SMAT期间具有非常低的堆叠过失能量的材料。表面层中的晶粒细化过程涉及在变形谷物中形成平面位错阵列和双胞胎，双胞胎二线相交导致晶粒细分和马氏体转化，以及随机定向的精制晶体的形成。顶表层中纳米晶体的形成归因于较大的应变率和应变速率以及多向重复负载。 （c）2003 Acta Mitalietia Inc.由Elsevier Science Ltd.发布的所有权利保留。
A nanostructured surface layer was formed on an AISI 304 stainless steel with low stacking-fault energy by means of the surface mechanical attrition treatment (SMAT). The microstructure of the surface layer of the SMATed sample was characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and cross-sectional TEM observation was performed to reveal the deformation-driven grain refinement mechanism for the f.c.c. materials with very low stacking-fault energy during SMAT. The grain refinement process in the surface layer involves formation of planar dislocation arrays and twins in deformed grains, twin-twin intersections leading to grain subdivision and a martensite transformation as well, and formation of randomly orientated refined crystallites. The formation of nanocrystallites in the top surface layer was ascribed to the much large strain and strain rate, as well as the multidirectional repetitive loading. (C) 2003 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.