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<p>The high-temperature performance of traditional Ti60 alloys is limited under extreme temperatures and harsh ocean environments, primarily due to the heterogeneity of the α/β dual-phase structure in the surface oxide film. The significant differences in composition, structure, and growth kinetics between the β phase and α phase oxide films lead to stress concentration, which accelerates cracking or spalling of the oxide layer. In this study, we innovatively employed laser powder bed fusion (LPBF) technology to successfully fabricate a single-phase α' Ti60 alloy, fundamentally eliminating two-phase heterogeneity. We conducted high-temperature oxidation and hot salt experiments on this alloy. The results indicate that under hot salt corrosion and high-temperature oxidation conditions at 600 and 700&#xa0;°C, LPBF-processed (LPBF-ed) Ti60 alloys exhibit enhanced stability due to the elimination of defects associated with non-homogeneous oxide layer growth. Furthermore, by integrating studies on oxidation/corrosion kinetics with microstructural evolution, we elucidate the degradation mechanisms underlying corrosion in LPBF-ed Ti60 alloys.</p> Graphical abstract <p></p>

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Enhanced high-temperature oxidation and hot corrosion resistance of Ti60 alloy by laser powder bed fusion

  • 期刊论文

  • 发表日期：

    2025年12月21日

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  • Rongtao Zhu,
  • Ziyang Zhang,
  • Rongqiang Yan,
  • Chuang Li,
  • Jinliang Xu,
  • Longhan Duan,
  • Haoyang Xuan,
  • Tianlong Gao,
  • Muge Ren,
  • Zhiwen Xie

摘要

The high-temperature performance of traditional Ti60 alloys is limited under extreme temperatures and harsh ocean environments, primarily due to the heterogeneity of the α/β dual-phase structure in the surface oxide film. The significant differences in composition, structure, and growth kinetics between the β phase and α phase oxide films lead to stress concentration, which accelerates cracking or spalling of the oxide layer. In this study, we innovatively employed laser powder bed fusion (LPBF) technology to successfully fabricate a single-phase α' Ti60 alloy, fundamentally eliminating two-phase heterogeneity. We conducted high-temperature oxidation and hot salt experiments on this alloy. The results indicate that under hot salt corrosion and high-temperature oxidation conditions at 600 and 700 °C, LPBF-processed (LPBF-ed) Ti60 alloys exhibit enhanced stability due to the elimination of defects associated with non-homogeneous oxide layer growth. Furthermore, by integrating studies on oxidation/corrosion kinetics with microstructural evolution, we elucidate the degradation mechanisms underlying corrosion in LPBF-ed Ti60 alloys.

Graphical abstract