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<p>This study employed semi-continuous induction melting to fabricate a large-scale TA17 titanium alloy ingot (φ280 mm). The influence mechanism of the hot extrusion process on microstructural evolution and mechanical properties was systematically investigated. Multi-scale characterization methods were used to reveal the regulatory effects of extrusion temperature (920-1050&#xa0;°C) and extrusion ratio (6.25:1 to 17.36:1) on dynamic recrystallization behavior, phase transformation characteristics, and texture evolution. When a high extrusion ratio (17.36:1) was applied near the <i>β</i> transus temperature (980&#xa0;°C), the material developed a fully dynamically recrystallized fine-grained structure (average grain size of 4.56&#xa0;<i>μ</i>m) and a strong basal texture (22.642 MRD). This resulted in an excellent strength–ductility combination (tensile strength of 836&#xa0;MPa, elongation of 19%). A quantitative process–microstructure–property relationship model was established, providing a theoretical basis and technical support for the industrial application of TA17 titanium alloy.</p>

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Influence of Extrusion Process on the Microstructure and Properties of Semi-Continuous Induction Melted TA17 Titanium Alloy Ingot

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Wei-dong Li,
  • Rong-ren Bai,
  • Hai-bin Qiao,
  • Hao Jiang,
  • Chao Zhao

摘要

This study employed semi-continuous induction melting to fabricate a large-scale TA17 titanium alloy ingot (φ280 mm). The influence mechanism of the hot extrusion process on microstructural evolution and mechanical properties was systematically investigated. Multi-scale characterization methods were used to reveal the regulatory effects of extrusion temperature (920-1050 °C) and extrusion ratio (6.25:1 to 17.36:1) on dynamic recrystallization behavior, phase transformation characteristics, and texture evolution. When a high extrusion ratio (17.36:1) was applied near the β transus temperature (980 °C), the material developed a fully dynamically recrystallized fine-grained structure (average grain size of 4.56 μm) and a strong basal texture (22.642 MRD). This resulted in an excellent strength–ductility combination (tensile strength of 836 MPa, elongation of 19%). A quantitative process–microstructure–property relationship model was established, providing a theoretical basis and technical support for the industrial application of TA17 titanium alloy.