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<p>This study investigates the influence of post-weld heat treatment (PWHT) on the microstructure, residual stress, and mechanical properties of laser beam welded Ti–6Al–4&#xa0;V joints. Defect-free welds with full penetration and a narrow fusion zone were produced using optimized laser welding parameters. The as-welded condition exhibited acicular α′ martensite due to rapid cooling (&gt; 10³ K/s), resulting in high tensile residual stress of approximately 150&#xa0;MPa in the fusion zone and a tensile strength of 680&#xa0;MPa. PWHT at 723&#xa0;°C promoted reducing residual stress to 96&#xa0;MPa and increasing tensile strength to 820&#xa0;MPa. PWHT at 910&#xa0;°C resulted the residual stress to 24&#xa0;MPa and improving tensile strength to 840&#xa0;MPa with 8.5% strain. The study establishes a direct correlation between residual stress evolution, and mechanical performance, identifying 910&#xa0;°C as the optimum PWHT condition for Ti–6Al–4&#xa0;V laser welds.</p>

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Microstructure, Residual Stress, and Mechanical Property Evolution in Laser Beam Welded Ti–6Al–4 V Joints Under Post-Weld Heat Treatment

  • 期刊论文

  • 发表日期：

    2026年7月23日

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  • Chandragiri Reddy Prasad,
  • Nandure Narayan Rao

摘要

This study investigates the influence of post-weld heat treatment (PWHT) on the microstructure, residual stress, and mechanical properties of laser beam welded Ti–6Al–4 V joints. Defect-free welds with full penetration and a narrow fusion zone were produced using optimized laser welding parameters. The as-welded condition exhibited acicular α′ martensite due to rapid cooling (> 10³ K/s), resulting in high tensile residual stress of approximately 150 MPa in the fusion zone and a tensile strength of 680 MPa. PWHT at 723 °C promoted reducing residual stress to 96 MPa and increasing tensile strength to 820 MPa. PWHT at 910 °C resulted the residual stress to 24 MPa and improving tensile strength to 840 MPa with 8.5% strain. The study establishes a direct correlation between residual stress evolution, and mechanical performance, identifying 910 °C as the optimum PWHT condition for Ti–6Al–4 V laser welds.