Effect of Surface Roughness and Compressive Residual Stress on the Fatigue Performance of TC4 Titanium Alloy Subjected to Laser Shock Wave Planishing

IF 3.1 2区材料科学 Q2 ENGINEERING, MECHANICAL

Fatigue & Fracture of Engineering Materials & Structures Pub Date : 2024-10-30 DOI:10.1111/ffe.14472

Lei Wu, FengZe Dai, XiZhang Chen

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Abstract

The milled surface of TC4 titanium alloy was treated by laser shock peening (LSP) and laser shock wave planishing (LSWP) to investigate the effect of compressive residual stress (CRS) and surface roughness (SR) on the vibration fatigue performance. The results demonstrate that although the amplitude of CRS induced by LSWP is lower than that of LSPed specimens, the vibration fatigue life of LSWPed specimens increased by 63.78% due to a significant reduction in SR from Sa 14.1 μm to Sa 4.21 μm. When the SR is low, increasing the amplitude of CRS is more advantageous to enhance fatigue life. The fractographic analysis further confirmed that compared with LSPed and T0.2-LSWPed specimens, T0.1-LSWPed specimens have considerably less initial fatigue crack initiation, and the crack initiation location is deeper. The fatigue striation spacing of T0.1-LSWPed specimens is the smallest (0.25 μm), greatly lowering the fatigue crack growth rate.

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激光冲击波抛光TC4钛合金表面粗糙度和残余压应力对疲劳性能的影响

通过激光冲击强化（LSP）和激光冲击波刨削（LSWP）处理 TC4 钛合金的铣削表面，研究压缩残余应力（CRS）和表面粗糙度（SR）对振动疲劳性能的影响。结果表明，虽然 LSWP 引发的 CRS 振幅低于 LSP 试样，但由于 SR 从 Sa 14.1 μm 显著降低到 Sa 4.21 μm，LSWP 试样的振动疲劳寿命提高了 63.78%。当 SR 较低时，增加 CRS 的振幅更有利于提高疲劳寿命。断口形貌分析进一步证实，与 LSPed 和 T0.2-LSWPed 试样相比，T0.1-LSWPed 试样的初始疲劳裂纹萌发要少得多，而且裂纹萌发位置更深。T0.1-LSWPed 试样的疲劳条纹间距最小（0.25 μm），大大降低了疲劳裂纹的增长速度。

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来源期刊

Fatigue & Fracture of Engineering Materials & Structures 工程技术-材料科学：综合

CiteScore

6.30

自引率

18.90%

发文量

256

审稿时长

4 months

期刊介绍： Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.