Improvement of gradient microstructure and properties of wire-arc directed energy deposition titanium alloy via laser shock peening

IF 6.1 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Science and Engineering: A Pub Date : 2024-10-22 DOI:10.1016/j.msea.2024.147422
Guanda Qu , Wei Guo , Jiaxin Shi , Dongsheng He , Yongxin Zhang , Yihao Dong , Jiaxuan Chi , Zhikang Shen , Ying Li , Zhenlin Chen , Hongqiang Zhang
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Abstract

Wire-arc directed energy deposition (WADED) technology has been widely used in the remanufacturing of titanium alloy structural components benefited from with the advantages such as high deposition efficiency and low cost. However, due to the coarse and anisotropic microstructure, the complex internal stresses and processing-induced rough surface significantly reduce fatigue performance and reliability of the remanufactured structural components. In this work, surface modification of titanium alloy WADED repair component was carried out via laser shock peening (LSP), and its gradient structure, microhardness, residual stress and fatigue performance and enhancement mechanism were systematically investigated. Results indicated that the different microstructure of each region led to different responses under the action of LSP, which was related to the change of dislocation density. LSP induced crystal defects such as high-density dislocations, twins and stacking faults on the surface. A variety of crystal defects gradually decreased with the depth from the strengthened surface, formed a gradient microstructure and significantly affected the microhardness and residual stress of the repaired components. The surface hardness and compressive residual stress of the repaired components were greatly increased after LSP and the hardened layer and compressive residual stress depth affected layer were 600 μm and 800 μm, respectively. The average fatigue life of the additive repair component increased by 197 % under the synergistic effect of compressive residual stress and gradient microstructure.
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通过激光冲击强化改善线弧定向能沉积钛合金的梯度微观结构和性能
线弧定向能沉积(WADED)技术具有沉积效率高、成本低等优点,已被广泛应用于钛合金结构部件的再制造。然而,由于钛合金微观结构粗糙且各向异性,复杂的内应力和加工引起的粗糙表面大大降低了再制造结构部件的疲劳性能和可靠性。在这项工作中,通过激光冲击强化(LSP)对钛合金 WADED 修复部件进行了表面改性,并系统地研究了其梯度结构、显微硬度、残余应力和疲劳性能及增强机制。结果表明,在 LSP 作用下,每个区域的不同微观结构会导致不同的反应,这与位错密度的变化有关。LSP 在表面诱发了高密度位错、孪晶和堆积断层等晶体缺陷。各种晶体缺陷随强化表面深度的增加而逐渐减少,形成梯度微观结构,并对修复后部件的显微硬度和残余应力产生显著影响。LSP 后,修复部件的表面硬度和压缩残余应力均大幅提高,硬化层和压缩残余应力影响层深度分别为 600 μm 和 800 μm。在压缩残余应力和梯度微结构的协同作用下,添加剂修复组件的平均疲劳寿命提高了 197%。
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来源期刊
Materials Science and Engineering: A
Materials Science and Engineering: A 工程技术-材料科学:综合
CiteScore
11.50
自引率
15.60%
发文量
1811
审稿时长
31 days
期刊介绍: Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.
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