Surface nanocrystallization of SS400 steel butt welded joint and its effect on the fatigue strength

被引：0
|
作者：
Li, Dong [1 ]
Chen, Huai-Ning [1 ]
Liu, Gang [1 ]
Lu, Ke [1 ]
Lin, Quan-Hong [1 ]
机构：
[1] Inst. of Metal Res., Chinese Acad. of Sci., Shenyang 110016, China
来源：
Hanjie Xuebao/Transactions of the China Welding Institution | 2002年 / 23卷 / 02期
关键词：
Butt welded joint - Fatigue strength - High energy shot peening - Surface nanocrystallization;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The welded joint of SS400 stell was treated by high-energy shot peening (HESP) technique, the surface layer was characterized by means of the XRD and TEM, and the changes of hardness, residual stress and fatigue strength were examined. Experimental results showed that nanostructured surface layer might form in the surface layer of welded joint after the HESP treatment, and the crystallographic orientations were nearly random; therefore uniform microstructure could be obtained. The microhardness of the nanostructured surface layer was found to be much higher than that of the sample before the HESP treatment, and the welding residual stresses in this layer became entirely compressive. This kind of nanostructured surface layer with compressive stress could significantly increase the fatigue strength of butt-welded joint.
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页码：18 / 21
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