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激光冲击强化钛合金熔覆修复试件疲劳性能研究

Fatigue Properties Research of Titanium Alloy Repaired by Laser Cladding and Laser Shock Processing

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摘要

激光成形修复钛合金构件存在修复区晶粒粗大和残余拉应力,以及不同区域间组织及性能不均匀的问题,导致修复构件的疲劳性能明显降低。本文采用激光冲击强化技术,对激光熔覆修复试件进行了表面强化,研究了激光冲击对其疲劳强度的影响,并从残余应力和微观组织等方面分析了激光冲击提高熔覆试件疲劳强度的原因。结果表明,钛合金基体试件的疲劳强度为401 MPa,激光熔覆试件的疲劳强度为365 MPa,下降了9%;激光冲击强化后,熔覆试件的疲劳强度达到了450.80 MPa,相比基体提高了23.5%。激光冲击强化在试件表层引入了数百兆帕的残余压应力,影响层深度可达430 μm,同时可使修复区的组织和性能变得均匀,从而提高了修复试件的疲劳抗力。

Abstract

When repaired by laser forming repair, there generates tensile residual stress and bulky grains in the repair zone of titanium alloy components. Meanwhile, microstructures and performances are ill-distributed between the repair and matrix zone. Due to all above, fatigue strength of the repaired components is reduced seriously. Laser shock processing is adopted to treat the specimens which are repaired by laser cladding. The effect of laser shock processing on fatigue strength of the repaired specimens is researched. Mechanism of the effect is demonstrated by residual stress and microstructure analysis. The results suggest that fatigue limit of the matrix specimens is 401 MPa, but that of the laser cladding specimens is 365 MPa, which decreases by 9%; while treated by laser shock processing, fatigue limit of laser cladding specimens is improved up to 450.80 MPa, which increases by 23.5% . Considerable compressive residual stress is introduced by laser shock processing in the material surface, and depth of it reaches at 430 μm. Moreover, microstructures and performances are well-distributed. Compressive residual stress and improved microstructures are the reasons for that fatigue strength is enhanced.

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中图分类号:TN249;TG665

DOI:10.3788/cjl201542.1103008

所属栏目:激光制造

责任编辑:宋梅梅  信息反馈

基金项目:国家973计划(2015CB057400),国家自然科学基金(51205406)

收稿日期:2015-05-19

修改稿日期:2015-07-18

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作者单位    点击查看

何卫锋:空军工程大学等离子体动力学重点实验室, 陕西 西安 710038
张金:空军工程大学等离子体动力学重点实验室, 陕西 西安 710038
杨卓君:空军工程大学等离子体动力学重点实验室, 陕西 西安 710038
杨竹芳:空军工程大学等离子体动力学重点实验室, 陕西 西安 710038
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
李靖: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:何卫锋(hehe_coco@163.com)

备注:何卫锋(1977—),男,副教授,主要从事航空发动机结构疲劳断裂与表面工程技术方面的研究。

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引用该论文

He Weifeng,Zhang Jin,Yang Zhuojun,Yang Zhufang,Li Yuqin,Li Jing. Fatigue Properties Research of Titanium Alloy Repaired by Laser Cladding and Laser Shock Processing[J]. Chinese Journal of Lasers, 2015, 42(11): 1103008

何卫锋,张金,杨卓君,杨竹芳,李玉琴,李靖. 激光冲击强化钛合金熔覆修复试件疲劳性能研究[J]. 中国激光, 2015, 42(11): 1103008

被引情况

【1】罗开玉,周阳,鲁金忠,刘波. 激光冲击强化对316L不锈钢熔覆层微观结构和性能的影响. 中国激光, 2017, 44(4): 402005--1

【2】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. 激光与光电子学进展, 2017, 54(6): 61402--1

【3】朱 然,张永康,孙桂芳,李 普,张胜标,倪中华. 三维平顶光束激光冲击2024铝合金的残余应力场数值模拟. 中国激光, 2017, 44(8): 802007--1

【4】葛茂忠,项建云,汤洋. 激光冲击处理对TC4修复件疲劳裂纹扩展速率的影响. 激光与光电子学进展, 2018, 55(7): 71405--1

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