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<p>This study systematically investigates the effects of dual-stage heat treatment on residual stress relief and fatigue life of severely cold-rolled Ti6Al4V alloy. The synergistic influence of severe plastic deformation and dual-stage heat treatment on residual stress evolution and fatigue performance is examined. Two dual-stage heat treatment routes were designed: HT1 involves continuous heating with a 2&#xa0;h hold at 400&#xa0;°C followed by ramping to the second-stage temperature, while HT2 includes intermediate cooling to room temperature before reheating. Experimental and simulation results show that extended second-stage treatment enhances stress relaxation; for example, under HT1 at 600&#xa0;°C for 4&#xa0;h, compressive residual stress at 4.5&#xa0;mm depth decreased from −101.6 to −82.8&#xa0;MPa. Moreover, optimized HT2 conditions (600&#xa0;°C for 2&#xa0;h) improved fatigue life by 16.1% compared with HT1. This work provides a comprehensive thermomechanical framework for residual stress control and fatigue optimization in Ti6Al4V, offering guidance for enhancing the service stability of high-performance titanium alloy components.</p>

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Study on the Impact of Dual-Stage Heat Treatment on Residual Stress and Fatigue Life of Severely Plastic Deformed Ti6Al4V Titanium Alloy

  • 期刊论文

  • 发表日期：

    2026年5月7日

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  • Ping Zhang,
  • Yajie Sun,
  • Xiaomin Jiang,
  • Guohong Li

摘要

This study systematically investigates the effects of dual-stage heat treatment on residual stress relief and fatigue life of severely cold-rolled Ti6Al4V alloy. The synergistic influence of severe plastic deformation and dual-stage heat treatment on residual stress evolution and fatigue performance is examined. Two dual-stage heat treatment routes were designed: HT1 involves continuous heating with a 2 h hold at 400 °C followed by ramping to the second-stage temperature, while HT2 includes intermediate cooling to room temperature before reheating. Experimental and simulation results show that extended second-stage treatment enhances stress relaxation; for example, under HT1 at 600 °C for 4 h, compressive residual stress at 4.5 mm depth decreased from −101.6 to −82.8 MPa. Moreover, optimized HT2 conditions (600 °C for 2 h) improved fatigue life by 16.1% compared with HT1. This work provides a comprehensive thermomechanical framework for residual stress control and fatigue optimization in Ti6Al4V, offering guidance for enhancing the service stability of high-performance titanium alloy components.