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<p>In order to further improve the mechanical properties of TC4 titanium alloy, the TC4 titanium alloy prepared by hot isostatic pressing was subjected to solution treatment at 890, 920, 950, 980, 1010, and 1040&#xa0;°C, and aged at 470, 500, 530, 560, and 590&#xa0;°C. The changes in microstructure and mechanical properties were studied using metallographic microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM), microhardness testing machine, and tensile testing machine. The results indicate that with increasing solution treatment temperature, the hardness and strength of TC4 titanium alloy gradually increase, while the elongation decreases. After solution treatment at 980&#xa0;°C, the alloy exhibits excellent comprehensive properties, with a hardness of 394.9&#xa0;HV, an ultimate tensile strength of 1084 MPa, and a yield strength of 991&#xa0;MPa. Following solution and aging treatment, the acicular martensitic α′ phase and metastable β phase decompose into a finely dispersed and stable α + β phase. As the aging temperature increases, the hardness and strength of TC4 titanium alloy gradually decrease, and the elongation gradually increases. When the solution treatment is performed at 980&#xa0;°C and the aging treatment at 500&#xa0;°C, the alloy achieves an optimal balance of hardness, strength, and ductility, with the elongation increasing to 11.9%. The fracture morphology of the tensile specimens exhibits characteristics of ductile fracture.</p>

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Effect of Heat Treatment on Microstructure and Properties of TC4 Titanium Alloy

  • 期刊论文

  • 发表日期：

    2025年9月8日

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  • Yanqing Jiang,
  • Lin Geng,
  • Guofeng Zhang

摘要

In order to further improve the mechanical properties of TC4 titanium alloy, the TC4 titanium alloy prepared by hot isostatic pressing was subjected to solution treatment at 890, 920, 950, 980, 1010, and 1040 °C, and aged at 470, 500, 530, 560, and 590 °C. The changes in microstructure and mechanical properties were studied using metallographic microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM), microhardness testing machine, and tensile testing machine. The results indicate that with increasing solution treatment temperature, the hardness and strength of TC4 titanium alloy gradually increase, while the elongation decreases. After solution treatment at 980 °C, the alloy exhibits excellent comprehensive properties, with a hardness of 394.9 HV, an ultimate tensile strength of 1084 MPa, and a yield strength of 991 MPa. Following solution and aging treatment, the acicular martensitic α′ phase and metastable β phase decompose into a finely dispersed and stable α + β phase. As the aging temperature increases, the hardness and strength of TC4 titanium alloy gradually decrease, and the elongation gradually increases. When the solution treatment is performed at 980 °C and the aging treatment at 500 °C, the alloy achieves an optimal balance of hardness, strength, and ductility, with the elongation increasing to 11.9%. The fracture morphology of the tensile specimens exhibits characteristics of ductile fracture.