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Effect of Laser Shock Peening on Residual Stress, Microstructure and Hot Corrosion Behavior of Damage-Tolerant TC21 Titanium Alloy

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Abstract

The effect of laser shock peening (LSP) on the residual stress, microstructure and hot corrosion behavior of damage-tolerant TC21 alloy was investigated. The equilateral scanning pattern was adopted to obtain a large overlapping area for LSP. The hot corrosion experiments in a salt mixture composed of 75 wt.% Na2SO4 + 25 wt.% NaCl at 700 and 800 °C for a total exposure of 25 h were conducted. The results demonstrated that LSP caused a high compressive residual stress with a significant increase in micro-hardness and microstructural changes in the form of crystal defects, i.e., high density dislocations. The crystal defects promoted the outward diffusion of Al, Cr and Ti to form protective mixed oxides (Al, Cr, Ti)O2. These oxides improved the adhesion of outer oxide layer and hindered the inward diffusion of O, S and Cl, which was beneficial to improve hot corrosion resistance. The mass gains of LSP-treated specimens after hot corrosion at 700 and 800 °C were, respectively, 3.72 and 4.78 mg/cm2, which were much lower than those of untreated specimens (5.65 and 6.81 mg/cm2). Therefore, LSP leads to an improvement in resistance to hot corrosion of TC21 alloy.

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Acknowledgment

The authors are grateful to the support provided by the National Key R&D Program of China (No. 2016YFB1102602), National Natural Science Foundation of China (No. 51775419), National Natural Science Foundation of China (No. 51575432) and the Program for ChangJiang Scholars and Innovative Research Team in University (No. IRT_15R54).

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Authors and Affiliations

  1. State Key Laboratory for Manufacturing System Engineering, Xi’an Jiaotong University, Xi’an, 710054, China

    Yongxiang Geng, Xuesong Mei, Kedian Wang, Xin Yan, Zhengjie Fan, Wenqiang Duan & Wenjun Wang

  2. Shaanxi Key Laboratory of Intelligent Robots, Xi’an Jiaotong University, Xi’an, 710049, China

    Xuesong Mei

  3. School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an, 710049, China

    Yongxiang Geng, Xuesong Mei, Kedian Wang, Xia Dong, Xin Yan, Zhengjie Fan, Wenqiang Duan & Wenjun Wang

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  1. Yongxiang Geng
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Correspondence to Kedian Wang.

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Geng, Y., Mei, X., Wang, K. et al. Effect of Laser Shock Peening on Residual Stress, Microstructure and Hot Corrosion Behavior of Damage-Tolerant TC21 Titanium Alloy. J. of Materi Eng and Perform 27, 4703–4713 (2018). https://doi.org/10.1007/s11665-018-3575-4

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