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<p>This study systematically examines the effects of various ultrasonic impact treatment (UIT) process parameters on the fatigue resistance of TC4 titanium alloy laser-welded joints. Two impact durations (10, 15&#xa0;min) and two impact amplitudes (18, 25&#xa0;μm) were orthogonally combined to form four test parameter sets. The effects of different UIT parameters on surface roughness, microstructure, microhardness, residual stress, stress–strain behavior, and fatigue properties of TC4 laser welds were examined. The results show that increasing impact amplitude significantly affects surface roughness, microstructure, microhardness, and residual stresses, particularly with longer impact duration. Similarly, with larger impact amplitude, increasing impact duration has a greater effect on surface roughness, microstructure, microhardness, and residual stress. Compared to unprocessed specimens, the fatigue life of those with (impact duration, amplitude) combinations of (10&#xa0;min, 18&#xa0;μm), (10&#xa0;min, 25&#xa0;μm), (15&#xa0;min, 18&#xa0;μm), and (15&#xa0;min, 25&#xa0;μm) increased by 31.2, 164.5, 42.1, and 186.1%, respectively. In the early and middle stages of crack propagation, increased impact duration and amplitude strongly inhibited fatigue crack growth. In contrast, in the later stages of crack propagation, larger impact duration and amplitude had little effect on fatigue crack growth. Therefore, UIT process parameters have different effects at various stages of crack propagation in the specimens.</p>

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Effects of Ultrasonic Impact Treatment Process Parameters on the Fatigue Properties of TC4 Titanium Alloy Laser-Welded Joints

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • Jiahui Cong,
  • Shoulong Gao,
  • Song Zhou,
  • Zhuo Liu,
  • Naijing Wang

摘要

This study systematically examines the effects of various ultrasonic impact treatment (UIT) process parameters on the fatigue resistance of TC4 titanium alloy laser-welded joints. Two impact durations (10, 15 min) and two impact amplitudes (18, 25 μm) were orthogonally combined to form four test parameter sets. The effects of different UIT parameters on surface roughness, microstructure, microhardness, residual stress, stress–strain behavior, and fatigue properties of TC4 laser welds were examined. The results show that increasing impact amplitude significantly affects surface roughness, microstructure, microhardness, and residual stresses, particularly with longer impact duration. Similarly, with larger impact amplitude, increasing impact duration has a greater effect on surface roughness, microstructure, microhardness, and residual stress. Compared to unprocessed specimens, the fatigue life of those with (impact duration, amplitude) combinations of (10 min, 18 μm), (10 min, 25 μm), (15 min, 18 μm), and (15 min, 25 μm) increased by 31.2, 164.5, 42.1, and 186.1%, respectively. In the early and middle stages of crack propagation, increased impact duration and amplitude strongly inhibited fatigue crack growth. In contrast, in the later stages of crack propagation, larger impact duration and amplitude had little effect on fatigue crack growth. Therefore, UIT process parameters have different effects at various stages of crack propagation in the specimens.