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<p>In order to investigate the influence of initial hydrogen pressure on the crack healing of TC21 alloy, hot-compression healing experiments under different initial hydrogen pressures were carried out. Moreover, a detailed microstructure analysis was performed near the healing interface, and tensile tests were conducted on the healed specimens to evaluate the bonding strength of the healing interface. The results showed that hydrogen significantly improved the interface healing rate of TC21 alloy. As the initial hydrogen pressure increased, the interface healing rate of TC21 alloy first rose to a maximum, then experienced a slight decrease, and ultimately stabilized. When the initial hydrogen pressure was 17.1&#xa0;kPa, TC21 alloy achieved complete healing. Hydrogen significantly changed the microstructure of the healed TC21 alloy, transforming from the equiaxed structure into the widmanstatten structure. Hydrogen significantly accelerated the closure of voids, but an excessively high initial hydrogen pressure would reduce the closure of voids. Hydrogen significantly promoted discontinuous dynamic recrystallization, but an excessively high initial hydrogen pressure promoted the generation of more δ hydrides in TC21 alloy during the healing process, which impeded discontinuous dynamic recrystallization and reduced the healing effect. Consequently, the tensile properties of TC21 alloy healed with hydrogen treatment were all significantly higher than those of TC21 alloy healed without hydrogen treatment. With the increase of the initial hydrogen pressure, the ultimate tensile strength and yield strength first increased significantly, then decreased slightly, and finally tended to be stable.</p>

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Effect of hydrogen on crack healing and tensile properties of TC21 alloy

  • 期刊论文

  • 发表日期：

    2025年10月23日

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  • Baoguo Yuan,
  • Xiang Tian,
  • Mu Chen,
  • Qiang Chen,
  • Xiaoxue Zhang,
  • Bingfeng Bao,
  • Wei Wan

摘要

In order to investigate the influence of initial hydrogen pressure on the crack healing of TC21 alloy, hot-compression healing experiments under different initial hydrogen pressures were carried out. Moreover, a detailed microstructure analysis was performed near the healing interface, and tensile tests were conducted on the healed specimens to evaluate the bonding strength of the healing interface. The results showed that hydrogen significantly improved the interface healing rate of TC21 alloy. As the initial hydrogen pressure increased, the interface healing rate of TC21 alloy first rose to a maximum, then experienced a slight decrease, and ultimately stabilized. When the initial hydrogen pressure was 17.1 kPa, TC21 alloy achieved complete healing. Hydrogen significantly changed the microstructure of the healed TC21 alloy, transforming from the equiaxed structure into the widmanstatten structure. Hydrogen significantly accelerated the closure of voids, but an excessively high initial hydrogen pressure would reduce the closure of voids. Hydrogen significantly promoted discontinuous dynamic recrystallization, but an excessively high initial hydrogen pressure promoted the generation of more δ hydrides in TC21 alloy during the healing process, which impeded discontinuous dynamic recrystallization and reduced the healing effect. Consequently, the tensile properties of TC21 alloy healed with hydrogen treatment were all significantly higher than those of TC21 alloy healed without hydrogen treatment. With the increase of the initial hydrogen pressure, the ultimate tensile strength and yield strength first increased significantly, then decreased slightly, and finally tended to be stable.