期刊论文

Improving stress corrosion cracking resistance of stainless steel welded joints by laser shock peening

中文

强激光与粒子束

Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams

1001-4322

2015

27

6

12-17

10.11884/HPLPB201527.061003

国家重点基础研究发展计划项目(2015CB057400)； 国家自然科学基金项目(51205406)；

本校为其他机构

针对不锈钢焊接接头应力及组织分布不均匀,容易导致应力腐蚀开裂的问题,采用不等强度激光冲击波对316奥氏体不锈钢焊接接头进行处理。通过应力腐蚀试验、残余应力测试及微观组织分析,研究了激光冲击强化对焊接接头应力腐蚀抗性的影响及其作用机理。试验结果表明:激光冲击强化将焊接件的应力腐蚀断裂时间提高了33.48%。激光冲击波的作用,在焊接接头部位引入了高数值的残余压应力,一方面消除了热影响导致的残余拉应力,同时抵消了拉伸工作载荷的作用,降低局部应力梯度,从而延缓表面钝化膜的破裂;另一方面,激光冲击使焊接接头不同区域之间的微观组织均匀和细化,提高了微裂纹萌生的条件,降低了金属发...

Because the distribution of temperature field was not uniform during the processing of welding, the stress, microstructure and performances in different regions in the welded joints were different. And there ware residual tensile stress which might cause to stress corrosion cracking (SCC). The 316 austenitic stainless steel welded joints were treated by laser shock peening. In order to protect the welded joints from stress corrosion cracking, the laser shock waves were designed with different strengths in the weld, heat affected zone (HAZ) and ...