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<p>A novel current-assisted heat treatment die with “metal body + rounded graphite” structure was proposed to suppress the bending springback of TA15 titanium alloy. Results indicate that the die of metal–graphite rounded corner die with 316L lower die (Die #2) achieves targeted heating at 680&#xa0;℃, reducing the springback angle from 4° to 0.2° and basically eliminating springback. The thermo-electric coupling effect promotes stress relaxation and static recovery, decreasing dislocation density and residual stress significantly. Theoretical calculations indicate that dislocation motion acceleration is primarily governed by the local hot spot effect, with the electron wind effect negligible upon ignoring thermal conduction and other heat losses. This work provides a high-efficiency and low-energy method for precision bending of TA15 alloy.</p>

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Suppressing the Bending Springback of TA15 Titanium Alloy through a Current-Assisted Heat Treatment

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • Guoxin Pang,
  • Zhubin He,
  • Minghao Li,
  • Yanchao Jiang,
  • Xuewen Chen,
  • Junqing Guo,
  • Nan Xiang,
  • Hairui Zhang,
  • Guoqing Chen

摘要

A novel current-assisted heat treatment die with “metal body + rounded graphite” structure was proposed to suppress the bending springback of TA15 titanium alloy. Results indicate that the die of metal–graphite rounded corner die with 316L lower die (Die #2) achieves targeted heating at 680 ℃, reducing the springback angle from 4° to 0.2° and basically eliminating springback. The thermo-electric coupling effect promotes stress relaxation and static recovery, decreasing dislocation density and residual stress significantly. Theoretical calculations indicate that dislocation motion acceleration is primarily governed by the local hot spot effect, with the electron wind effect negligible upon ignoring thermal conduction and other heat losses. This work provides a high-efficiency and low-energy method for precision bending of TA15 alloy.