在喷砂前通过抛丸强化提高热喷涂钛合金的疲劳性能

IF 3.2 3区 材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS
Xiao-Xue Dong, Jian-Zhang Lu, Zhao-Lu Zhang, Mei-Jun Liu, Guan-Jun Yang
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引用次数: 0

摘要

热喷涂可有效提高钛合金的表面性能,但喷砂(GB)所需的表面粗化往往会降低疲劳性能。本研究建议在喷砂前进行喷丸强化(SP)预应力处理,以形成裂纹扩展抑制区,从而提高抗疲劳性能。模拟和实验证明,SP 预应力可产生高达约 200 µm 深度的高压缩应力(约 900 兆帕),有助于缓解 GB 尖锐突起造成的应力集中。因此,经过 SP 预应力处理的热喷涂 TC4 合金的裂纹扩展受到抑制,疲劳强度得以保持,而未经处理的同类合金的疲劳极限降低了 20%。此外,SP 预应力后的 GB 保持了较高的涂层粘结强度(60 兆帕)。这些发现推动了热喷涂钛合金在航空航天工程中的应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Enhancing Fatigue Performance of Thermal Spray Coated Titanium Alloy by Shot Peening Before Grit Blasting

Enhancing Fatigue Performance of Thermal Spray Coated Titanium Alloy by Shot Peening Before Grit Blasting

Thermal spraying effectively enhances the surface properties of titanium alloys, yet the required surface roughening by grit blasting (GB) often degrades fatigue performance. This study proposes shot peening (SP) prestressing prior to GB to create a crack extension inhibition zone, thereby enhancing fatigue resistance. Simulations and experiments demonstrated that SP prestressing generates high compressive stress (~900 MPa) up to a depth of ~ 200 µm, which helps to alleviate the stress concentrations caused by these sharp protrusions from GB. Consequently, crack propagation is inhibited, preserving the fatigue strength of SP-pretreated, thermally sprayed TC4 alloys, while untreated counterparts show a 20% reduction in fatigue limit. Additionally, SP prestressing followed by GB maintains a high coating bond strength (>60 MPa). These findings advance the application of thermally sprayed titanium alloys in aerospace engineering.

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来源期刊
Journal of Thermal Spray Technology
Journal of Thermal Spray Technology 工程技术-材料科学:膜
CiteScore
5.20
自引率
25.80%
发文量
198
审稿时长
2.6 months
期刊介绍: From the scientific to the practical, stay on top of advances in this fast-growing coating technology with ASM International''s Journal of Thermal Spray Technology. Critically reviewed scientific papers and engineering articles combine the best of new research with the latest applications and problem solving. A service of the ASM Thermal Spray Society (TSS), the Journal of Thermal Spray Technology covers all fundamental and practical aspects of thermal spray science, including processes, feedstock manufacture, and testing and characterization. The journal contains worldwide coverage of the latest research, products, equipment and process developments, and includes technical note case studies from real-time applications and in-depth topical reviews.
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