引用本文:曹鑫,何卫锋,汪世广,唐琳,刘景元,胡家兴.激光冲击强化前处理对TiN/Ti涂层/基体疲劳性能的影响∗[J].中国表面工程,2021,34(3):120~129
Cao Xin,He Weifeng,Wang Shiguang,Tang Lin,Liu Jingyuan,Hu Jiaxing.Effect of Laser Shock Peening Pretreatment on Thefatigue Properties of TiN / Ticoating / Substrate[J].China Surface Engineering,2021,34(3):120~129
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激光冲击强化前处理对TiN/Ti涂层/基体疲劳性能的影响∗
曹鑫1, 何卫锋2, 汪世广2, 唐琳1, 刘景元3, 胡家兴3
1.中国空气动力研究与发展中心高速空气动力研究所 绵阳 621000;2.空军工程大学等离子体动力学重点实验室 西安 710038;3.空军航空大学航空作战勤务学院 长春 130022
摘要:
采用磁过滤阴极真空弧技术在 TC4 钛合金表面沉积抗冲蚀多层梯度 TiN/ Ti 涂层,沉积前对基体进行激光冲击强化前处理。 采用原子力显微镜、纳米压痕和划痕仪表征了试件的表面形貌、基本力学性能等,对试件的疲劳性能进行了考核,并分析了疲劳断口形貌。 结果表明,LSP 前处理在 TC4 表面形成了厚度约为 300 μm,具有高硬度和残余压应力的硬化层。 TC4 合金基体的平均疲劳强度为 373. 8 MPa,制备 TiN/ Ti 涂层后试件的疲劳强度为 363. 7 MPa,较基体略有降低。 增加 LSP 前处理后试件的疲劳强度为 411. 9 MPa,较 TiN/ Ti 涂层试件提高 13. 3%,较无涂层试件提高 10. 2%。 TiN/ Ti 涂层可以抑制表面上的裂纹萌生并减缓其扩展速率,但在拉伸过程中发生破碎而与基体发生剥离,裂纹抑制效果有限,且涂层的破裂促进了裂纹扩展。 采用 LSP 前处理后,TC4 表面形成的硬化层增加裂纹萌生难度,且提高的结合强度可降低裂纹扩展速率。
关键词:  TiN/ Ti 涂层  激光冲击强化  Ti-6Al-4V 合金  疲劳性能
DOI：10.11933/j.issn.1007-9289.20210225001
分类号:TG156;TB114
基金项目:国家科技重大专项资助项目(2017-VII-0102-0107)
Effect of Laser Shock Peening Pretreatment on Thefatigue Properties of TiN / Ticoating / Substrate
Cao Xin1, He Weifeng2, Wang Shiguang2, Tang Lin1, Liu Jingyuan3, Hu Jiaxing3
1.High Speed Aerodynamics Institute, China Aerodynamics Research and Develpoment Center, Mianyang 621000 , China;2.Science and Technology on Plasma Dynamics Laboratory, Air Force Engineering University, Xi’an 710038 , China;3.Aviation Operations Service College, Air Force Aviation University, Changchun 130022 , China
Abstract:
The anti-erosion TiN/ Ti coating with multilayer gradient structure was prepared on the surface of TC4 titanium alloy by filtered cathodic vacuum arc (FCVA) deposition method. The substrate is subjected to laser shock strengthening pretreatment before deposition. The surface morphologies and mechanical properties of the specimens were characterized by atomic force microscope, nanoindentation, and scratch tester. The fatigue properties of the specimens were evaluated and the fatigue fracture morphologies were analyzed. The results showed that the LSP pretreatment formed a hardened layer with a thickness of about 300 μm, high hardness, and residual compressive stress on the surface of TC4. The average fatigue strength of the TC4 alloy is 373. 8 MPa, and the fatigue strength of the sample after preparing the TiN/ Ti coating is 363. 7 MPa, which is slightly lower than that of the original substrate. The fatigue strength of the sample after LSP-pretreatment is 411. 9 MPa, which is 13. 3% higher than that of the TiN/ Ti coated sample and 10. 2% higher than that of the uncoated sample. TiN/ Ti coating can inhibit the initiation of cracks on the surface and slow down its growth rate. However, the crack suppression effect is limited when the TiN/ Ti coating is broken and peels off from the substrate during the tensile process, and the break of the coating promotes the crack propagation. After LSP pretreatment, the hardened layer formed on the surface of TC4 furtherincreases the difficulty of crack initiation, and the increased bonding strength can reduce the crack growth rate.
Key words:  TiN/ Ti coating  laser shock peening  Ti-6Al-4V alloy  fatigue property
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