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<p>In this paper, a collaborative strengthening method about electropulsing treatment plus step-quench treatment has been introduced to produce a typical gradient microstructure for the Ti55531 titanium alloy. The gradient microstructure is characterized using optical microscopy, scanning electron microscopy, electron backscatter diffraction (EBSD) and image analysis software. The influence of the collaborative strengthening process on the gradient microstructure has been systematically observed and quantitatively analyzed. The results suggest that in the equiaxed zone, transition zone and lamellar zone, the collaborative strengthening process has a different influence on α precipitation. Then, the dependency curve between heat treatment parameters and gradient microstructure was established, respectively. The mechanism of precipitation was revealed in different regions by EBSD orientation analysis. Finally, the influence of gradient microstructure on the hardness distribution, strength and ductility of titanium alloys was revealed, which provides a strong theoretical basis for the microstructural design and preparation.</p>

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Influence of Electropulsing Treatment and Step-Quench Process on the Gradient Structure Evolution of Ti55531 Alloy

  • 期刊论文

  • 发表日期：

    2025年2月20日

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  • Changsheng Tan,
  • Tao Yang,
  • Jiahao He,
  • Qiang Dang,
  • Hengping Lu,
  • Linxian Wen,
  • Guojun Zhang

摘要

In this paper, a collaborative strengthening method about electropulsing treatment plus step-quench treatment has been introduced to produce a typical gradient microstructure for the Ti55531 titanium alloy. The gradient microstructure is characterized using optical microscopy, scanning electron microscopy, electron backscatter diffraction (EBSD) and image analysis software. The influence of the collaborative strengthening process on the gradient microstructure has been systematically observed and quantitatively analyzed. The results suggest that in the equiaxed zone, transition zone and lamellar zone, the collaborative strengthening process has a different influence on α precipitation. Then, the dependency curve between heat treatment parameters and gradient microstructure was established, respectively. The mechanism of precipitation was revealed in different regions by EBSD orientation analysis. Finally, the influence of gradient microstructure on the hardness distribution, strength and ductility of titanium alloys was revealed, which provides a strong theoretical basis for the microstructural design and preparation.