Microstructural and thermal relaxation of residual stress in dual peened TA15 titanium alloy fabricated by SLM

IF 4.8 2区 材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2024-10-26 DOI:10.1016/j.matchar.2024.114496
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Abstract

TA15 (Ti-6Al-2Zr-1Mo-1 V) is a near-α titanium alloy widely used in aerospace applications due to its high specific strength and corrosion resistance. However, like other titanium alloys, TA15 faces significant manufacturing challenges. Selective Laser Melting (SLM), a high-precision additive manufacturing technique, enables the efficient production of complex components but also introduces issues such as tensile residual stress. This study investigates the effects of dual shot peening on the residual stress and microstructure of SLM-fabricated TA15 alloy, and analyzes the thermal relaxation behavior post-peening. The results indicate that shot peening induces a compressive residual stress (CRS) field near the material surface and significantly refines the grains in the deformed layer, resulting in the formation of nanocrystals. The introduction of low-intensity ceramic shots in dual shot peening effectively improves the surface quality and enhances CRS, although it has minimal impact on grain size and microstrain. Using the ZWA model, the activation energy for thermal relaxation of residual stress and microstrain was determined, revealing that their relaxation behavior is controlled by thermally activated diffusion of point defects, especially vacancies. Post-thermal exposure, extensive dislocation annihilation and grain growth were observed in the deformed layer, with recrystallized grain size increasing with annealing temperature and depth.
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利用 SLM 制造的双层强化 TA15 钛合金中残余应力的微观结构和热松弛
TA15(Ti-6Al-2Zr-1Mo-1 V)是一种接近α的钛合金,由于具有高比强度和耐腐蚀性,被广泛应用于航空航天领域。然而,与其他钛合金一样,TA15 也面临着巨大的制造挑战。选择性激光熔融(SLM)是一种高精度快速成型制造技术,可高效生产复杂部件,但也会带来拉伸残余应力等问题。本研究调查了双喷丸强化对 SLM 制造的 TA15 合金的残余应力和微观结构的影响,并分析了强化后的热松弛行为。结果表明,喷丸强化会在材料表面附近产生压缩残余应力(CRS)场,并显著细化变形层中的晶粒,从而形成纳米晶。在双喷丸强化过程中引入低强度陶瓷喷丸可有效改善表面质量并增强 CRS,但对晶粒大小和微应变的影响很小。利用 ZWA 模型确定了残余应力和微应变热松弛的活化能,发现它们的松弛行为是由点缺陷(尤其是空位)的热活化扩散控制的。热暴露后,在变形层中观察到广泛的位错湮灭和晶粒生长,再结晶晶粒大小随退火温度和深度的增加而增大。
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来源期刊
Materials Characterization
Materials Characterization 工程技术-材料科学:表征与测试
CiteScore
7.60
自引率
8.50%
发文量
746
审稿时长
36 days
期刊介绍: Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.
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