表面纳米化对SS400钢应力腐蚀性能的影响
Effect of Surface Nanocrystallization on Stress Corrosion Cracking of SS400 Steel
摘 要
采用高能喷丸技术对SS400钢表面进行纳米化处理,利用透射电子显微镜分析了表面纳米晶层的结构特征,同时对高能喷丸表面纳米化处理后残余应力沿厚度方向的变化进行了分析.结果表明:经过超声冲击处理后,试样表层的晶粒可细化至纳米尺度,且在表面形成厚度约为600 μm的压应力层,压应力沿试样深度方向逐渐减小直至过渡到拉应力.在98±3 ℃温度下,Ca(NO3)2 57％＋NH4NO3 3％溶液中进行的慢应变速率拉伸试验,结果表明,高能喷丸表面纳米化可以提高SS400钢的抗应力腐蚀开裂(SCC)性能.
高能喷丸
表面纳米化
应力腐蚀
SS400 steel
high energy shot peening
surface nanocrystallization
SCC
Abstract
A nanostructured surface layer was synthesized on SS400 steel by means of high energy shot peening (HESP).The refined microstructure in the top surface layer was characterized by means of transmission electron microscopy (TEM),and the residual stress variation along the depth of the treated sample was examined.Experimental results showed that after the HESP treatment the microstructure of the surface layer could be refined down into the nanoscale.The compressive stress induced by HESP decreased along the cross-section down to zero at about 600 μm.A compressive stress nanostrutured layer was achieved in the top surface of SS400 steel.The results of slow strain rate tests of SS400 steel in Ca(NO3)2 57％＋NH4NO3 3％ solution at 98±3 ℃ indicated that the resistance of SS400 steel to SCC had been improved.
中图分类号 TG174.4
所属栏目 试验研究
基金项目
收稿日期 2008/7/2
修改稿日期 2008/8/4
网络出版日期
作者单位点击查看
引用该论文: LI Dong,CHEN Huai-ning,XU Hong. Effect of Surface Nanocrystallization on Stress Corrosion Cracking of SS400 Steel[J]. Corrosion & Protection, 2009, 30(2): 84～86
被引情况:
【1】曹小建,李璨柱,苏昌敏,卞英植,王清远,村上理一, "A6061-T6铝合金经超声表面纳米化后的显微组织和性能",机械工程材料 38, 74-78(2014)
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参考文献
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【8】Zhang Y S,Han Z,Wang K,et al.Friction and wear behaviors of nanocrystalline surface layer of pure copper[J].Wear,2006,260:942-948.
【9】Tong W P,Tao N R,Wang Z B,et al.The formation of ε-Fe3-2N phase in a nanocrystalline Fe[J].Scripta Mater,2004,50:647-650.
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