Ultrasonic fatigue performance of the shot-peened TC4 titanium Alloy: Improved or deteriorated?

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2025-04-22 DOI:10.1016/j.msea.2025.148391

Qiang Wang , Tianyi Hu , Yuping Ren , Panfeng Xu , Yingjie Wu , Xin Zhi , Junliang Lin , Gaowu Qin

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Abstract

The mechanism behind the fatigue life improvement or deterioration of the shot peened TC4 titanium alloy rod used as ultrasonic scalpel is a valuable scientific issue. In this paper, the ultrasonic fatigue property of the shot peened TC4 titanium alloy rod specimen was investigated based on microstructure characterization, mechanical tests and ultrasonic fatigue tests. The experimental results show that obvious grain refinement can be observed in the topmost surface layer of the shot peened TC4 titanium alloy rod specimens. Moreover, a large number of crater defects left on the surface of specimens leading to the increase of surface roughness. A maximum residual compressive stress of approximately 450 MPa was introduced into the surface layer of the specimens. The microhardness distribution is very discrete at the same depth, and thus the contribution of microhardness enhancement to suppressing fatigue crack initiation is limited. Surprisingly, the fatigue lives of the shot peened TC4 titanium alloy rod specimens are slightly deteriorated as compared with that of the un-shot peened specimens. The fatigue risk factor model was used to evaluate the difficulty of fatigue crack initiation. By the calculation, the fatigue risks of the shot peened TC4 titanium alloy rod specimens are generally higher than that of the un-shot peened specimens under the same stress amplitude, which can be mainly attributed to the effect of the competition between the beneficial effects, i.e., the introduction of residual compressive stress, and the harmful effects, i.e., stress concentration caused by crater defects, on the initiation of fatigue cracks.

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喷丸TC4钛合金的超声疲劳性能：改善还是恶化？

超声手术刀用喷丸TC4钛合金棒疲劳寿命提高或恶化的机理是一个有价值的科学问题。通过显微组织表征、力学试验和超声疲劳试验，对喷丸强化TC4钛合金棒材试样的超声疲劳性能进行了研究。实验结果表明，喷丸处理的TC4钛合金棒材试样最表层有明显的晶粒细化。此外，试样表面留下了大量的弹坑缺陷，导致表面粗糙度增大。试样表层最大残余压应力约为450 MPa。同一深度下的显微硬度分布非常离散，因此提高显微硬度对抑制疲劳裂纹萌生的作用有限。令人惊讶的是，喷丸处理的TC4钛合金棒材试样的疲劳寿命比未喷丸处理的试样略有下降。采用疲劳风险因子模型对疲劳裂纹起裂难易程度进行评价。通过计算可知，在相同应力幅值下，喷丸处理TC4钛合金棒材试样的疲劳风险普遍高于未喷丸处理的试样，这主要是由于残余压应力的引入等有利影响与凹坑缺陷引起的应力集中等有害影响相互竞争对疲劳裂纹的起裂产生的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

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.