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首页> 美国卫生研究院文献>Materials >Effects of WC-17Co Coating Combined with Shot Peening Treatment on Fatigue Behaviors of TC21 Titanium Alloy
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Effects of WC-17Co Coating Combined with Shot Peening Treatment on Fatigue Behaviors of TC21 Titanium Alloy

机译：WC-17Co涂层结合喷丸处理对TC21钛合金疲劳行为的影响

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摘要

The improvement and mechanism of the fatigue resistance of TC21 high-strength titanium alloy with a high velocity oxygen fuel (HVOF) sprayed WC-17Co coating was investigated. X-ray diffraction (XRD) and the corresponding stress measurement instrument, a surface roughness tester, a micro-hardness tester, and a scanning electron microscope (SEM) were used to determine the properties of the HVOF WC-17Co coating with or without shot peening. The fatigue behavior of the TC21 titanium alloy with or without the WC-17Co coating was determined by using a rotating bending fatigue testing machine. The results revealed that the polished HVOF sprayed WC-17Co coating had almost the same fatigue resistance as the TC21 titanium alloy substrate. This resulted from the polishing-induced residual surface compressive stress and a decrease in the stress concentration on the surface of the coating. Moderate-intensity shot peening of the polished WC-17Co coatings resulted in significant improvement of the fatigue resistance of the alloy. Furthermore, the fatigue life was substantially higher than that of the substrate, owing to the deep distribution of residual stress and high compressive stress induced by shot peening. The improved surface toughness of the coating can effectively delay the initiation of fatigue crack propagation.
机译：研究了TC21高强度钛合金高速氧燃料喷涂WC-17Co涂层的抗疲劳性能改善机理。使用X射线衍射（XRD）和相应的应力测量仪器，表面粗糙度测试仪，显微硬度测试仪和扫描电子显微镜（SEM）来确定带有或不带有喷丸的HVOF WC-17Co涂层的性能喷丸。通过使用旋转弯曲疲劳试验机测定带有或不带有WC-17Co涂层的TC21钛合金的疲劳性能。结果表明，抛光的HVOF喷涂WC-17Co涂层具有与TC21钛合金基体几乎相同的耐疲劳性。这是由于抛光引起的残余表面压缩应力和涂层表面应力集中的减小所致。抛光的WC-17Co涂层的中等强度喷丸处理显着改善了合金的抗疲劳性。而且，由于喷丸硬化引起的残余应力的深分布和高压缩应力，其疲劳寿命大大高于基体的疲劳寿命。涂层表面韧性的改善可以有效地延迟疲劳裂纹扩展的开始。

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