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激光冲击强化316L不锈钢焊接接头的耐腐蚀性能

Corrosion Resistance Property of 316L Stainless Steel Welding Joints Treated by Laser Shock Peening

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摘要

采用激光冲击强化的方法改善了316L不锈钢焊接接头的耐腐蚀性能,分析了焊接接头表层的微观结构和残余应力分布。结果表明,激光冲击强化使焊接接头表层残余拉应力显著减小,提高了焊接接头的电极电位,阻碍了腐蚀介质向材料的扩散;同时,激光冲击强化细化了基体晶粒,形成了大量的滑移带和变形孪晶组织,延缓了应力腐蚀裂纹的扩展,增强了316L不锈钢焊接接头的耐腐蚀性能。

Abstract

The corrosion resistance property of 316L stainless steel welding joints is improved with the laser shock peening method. The microstructure and the residual stress distribution on the welding joint surface are analyzed. The results show that the residual tensile stress on the welding joint surface treated by laser shock peening is significantly reduced. The electrode potential of the welding joints increases and the diffusion of corrosive media is hindered. Moreover, as a result of laser shock peening, the matrix grain is refined and a large number of slip bands and deformation twins form, which makes the extension of stress corrosion cracks be delayed and improves the corrosion resistance property of 316L stainless steel welding joints.

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中图分类号:TG665

DOI:10.3788/lop54.061402

所属栏目:激光器与激光光学

基金项目:国家自然科学基金(51305456)

收稿日期:2016-12-14

修改稿日期:2017-01-31

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作者单位    点击查看

李玉琴:空军工程大学等离子体动力学重点实验室, 陕西 西安 710038
孟长军:西安文理学院生物与环境工程学院, 陕西 西安 710065
王学德:空军工程大学等离子体动力学重点实验室, 陕西 西安 710038
罗思海:空军工程大学等离子体动力学重点实验室, 陕西 西安 710038
徐伟胜:空军工程大学等离子体动力学重点实验室, 陕西 西安 710038

联系人作者:李玉琴(yuqin511@163.com)

备注:李玉琴(1982-),女,硕士,讲师,主要从事激光冲击强化技术方面的研究。

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引用该论文

Li Yuqin,Meng Changjun,Wang Xuede,Luo Sihai,Xu Weisheng. Corrosion Resistance Property of 316L Stainless Steel Welding Joints Treated by Laser Shock Peening[J]. Laser & Optoelectronics Progress, 2017, 54(6): 061402

李玉琴,孟长军,王学德,罗思海,徐伟胜. 激光冲击强化316L不锈钢焊接接头的耐腐蚀性能[J]. 激光与光电子学进展, 2017, 54(6): 061402

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