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<p>The effects of processing methods (radial forging and hot rolling) and the subsequent double annealing treatment on the microstructure and mechanical properties of TA11 titanium alloy were studied in this paper. Metallograph and EBSD analyses showed that the alloy exhibited a mixed grain structure consisting of fine recrystallized grains and coarse deformed grains under both processing methods. The average grain size of hot-rolled alloy (~ 8&#xa0;μm) was significantly smaller than that of radial forged one (~ 12&#xa0;μm). After double annealing treatment (910&#xa0;°C/1&#xa0;h + 580&#xa0;°C /8&#xa0;h), the microstructural homogeneity of radial forged and hot-rolled specimen was improved and the grain size increased. The hot-rolled bar exhibited finer grains with higher proportion of recrystallization, which is attributed to its greater strain cumulation and more nucleation sites during hot rolling. Moreover, the radial forged alloy displays higher tensile strength, which was mainly due to dislocation strengthening. The higher geometrically necessary dislocation density (GND) is retained in the radial forged specimens which makes the dislocation strengthening higher than that of hot-rolled specimens by ~ 68&#xa0;MPa. However, the grain refinement strengthening of hot-rolled alloy is only slightly higher than that of radial forged one by ~ 8&#xa0;MPa.</p>

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The Influence of Hot Working Methods on the Microstructure Evolution and Mechanical Properties of TA11 Alloy

  • 期刊论文

  • 发表日期：

    2025年12月20日

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  • Zhaozhao Dong,
  • Wenguang Zhu,
  • Conghui Zhang,
  • Ruixuan Tian,
  • Qiang Ma,
  • Xiangmin Guo,
  • Pengcheng Zhao

摘要

The effects of processing methods (radial forging and hot rolling) and the subsequent double annealing treatment on the microstructure and mechanical properties of TA11 titanium alloy were studied in this paper. Metallograph and EBSD analyses showed that the alloy exhibited a mixed grain structure consisting of fine recrystallized grains and coarse deformed grains under both processing methods. The average grain size of hot-rolled alloy (~ 8 μm) was significantly smaller than that of radial forged one (~ 12 μm). After double annealing treatment (910 °C/1 h + 580 °C /8 h), the microstructural homogeneity of radial forged and hot-rolled specimen was improved and the grain size increased. The hot-rolled bar exhibited finer grains with higher proportion of recrystallization, which is attributed to its greater strain cumulation and more nucleation sites during hot rolling. Moreover, the radial forged alloy displays higher tensile strength, which was mainly due to dislocation strengthening. The higher geometrically necessary dislocation density (GND) is retained in the radial forged specimens which makes the dislocation strengthening higher than that of hot-rolled specimens by ~ 68 MPa. However, the grain refinement strengthening of hot-rolled alloy is only slightly higher than that of radial forged one by ~ 8 MPa.