航空材料学报2011，Vol.31Issue(2)：28-32,5.DOI:10.3969/j.issn.1005-5053.2011.2.006
超声冲击处理对2A12铝合金焊接接头疲劳性能的影响
Influence of Ultrasonic Impact Treatment on Fatigue Properties of 2A12 Aluminum Alloy Welded Joints
摘要
Abstract
2A12 aluminum alloy welded joint was full coverage strengthened by ultrasonic impact treatment (UIT). The S-N curves of welded joint samples with and without UIT were set up by making bending fatigue test. The effect of UIT on fatigue properties of aluminum alloy welded joint was analyzed. The fatigue fracture mechanisms of these samples with and without UIT were studied by microstructure, residual stress and fracture surface analysis. The results showed that the fatigue limit of 2A12 aluminum alloy butt-welded joints was increased 38.5％. At the same time, the surface defects of welded joints were reduced substantially after ultrasonic impact treatment. The coarse-grained microstructures of top-surface layer of welded joint were refined after the UIT. The metallurgical structure of the near surface material of the joint was thus density. Compressive residual stress was induced at the surface of welded joints by UIT.关键词
超声冲击处理/铝合金/焊接接头/疲劳Key words
ultrasonic impact treatment/ aluminum alloy/ welded joint/ fatigue properties分类
金属材料引用本文复制引用
李占明,朱有利,辛毅..超声冲击处理对2A12铝合金焊接接头疲劳性能的影响[J].航空材料学报,2011,31(2):28-32,5.基金项目
北京市自然科学基金资助(3093027) （3093027）
