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<p>This study investigates the effects of annealing temperatures (700&#xa0;°C, 800&#xa0;°C, 900&#xa0;°C, and 1000&#xa0;°C) on the microstructure and properties of a Ti–0.25O–0.35Fe (wt%) hot-rolled sheet. The results indicate that in the <i>α</i> + <i>β</i> two-phase region, the annealed microstructure evolves from equiaxed <i>α</i> grains to a mixture of equiaxed <i>α</i> and lamellar <i>α</i> with increasing temperature. Concurrently, the average grain size of the equiaxed <i>α</i> phase increases, and the crystallographic c-axis of the <i>α</i> phase rotates from being parallel to the transverse direction (TD) toward various angles relative to the normal direction (ND). When annealed above the <i>β</i>-transus temperature, the microstructure consists entirely of secondary lamellar <i>α</i> phase, and the grain orientation becomes more random. The sheet annealed at 800&#xa0;°C exhibits the optimal balance of strength and ductility. The fracture mechanism transitions from ductile to brittle with increasing annealing temperature, exhibiting completely brittle fracture above the <i>β</i>-transus. Furthermore, the sample annealed at 800&#xa0;°C demonstrates the lowest friction coefficient, the smallest wear volume, the lowest wear rate, and consequently the optimal wear resistance.</p>

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Effect of annealing temperature on the microstructure and properties of Ti–0.25O–0.35Fe hot-rolled sheet

  • 期刊论文

  • 发表日期：

    2026年4月25日

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  • Shuqi Deng,
  • Yongsheng Wang,
  • Haowei Liang,
  • Jie Li,
  • Sheng Huang,
  • Kun Liu,
  • Han Xiao

摘要

This study investigates the effects of annealing temperatures (700 °C, 800 °C, 900 °C, and 1000 °C) on the microstructure and properties of a Ti–0.25O–0.35Fe (wt%) hot-rolled sheet. The results indicate that in the α + β two-phase region, the annealed microstructure evolves from equiaxed α grains to a mixture of equiaxed α and lamellar α with increasing temperature. Concurrently, the average grain size of the equiaxed α phase increases, and the crystallographic c-axis of the α phase rotates from being parallel to the transverse direction (TD) toward various angles relative to the normal direction (ND). When annealed above the β-transus temperature, the microstructure consists entirely of secondary lamellar α phase, and the grain orientation becomes more random. The sheet annealed at 800 °C exhibits the optimal balance of strength and ductility. The fracture mechanism transitions from ductile to brittle with increasing annealing temperature, exhibiting completely brittle fracture above the β-transus. Furthermore, the sample annealed at 800 °C demonstrates the lowest friction coefficient, the smallest wear volume, the lowest wear rate, and consequently the optimal wear resistance.