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<p>This paper aims to prove that the newly-designed Ti-44Al-4Nb-1W-0.1B alloy has good hot deformation processing capability. It is investigated by hot simulation compression experiment, presented by hot processing mapping and a hot processing window. The microstructure is investigated in detail. For a 1150°C/0.1&#xa0;s<sup>−1</sup> microstructure, α → β transformation occurs. The stress–strain coordination effect and high Schmid factor of B2 are beneficial to hot deformation processing, but shear stress-induced slip causes the sample to crack. For a 1200°C/0.01&#xa0;s<sup>−1</sup> microstructure, β → α transformation occurs. More sufficient DRX occurs to promote hot deformation processing. For a 1250°C/0.001&#xa0;s<sup>−1</sup> microstructure, β → α transformation occurs. The needle-like α<sub>2</sub> can be seen, and the preferred growth direction is &lt;0001&gt;α or &lt;hkl0&gt;α, which respectively have a rod shape and a plate shape. For the 1200°C/0.1&#xa0;s<sup>−1</sup> microstructure, DRX, CSL grain boundaries of the α<sub>2</sub> phase, and the high Schmid factor of the B2 phase are factors improving hot deformation processing. Actual forging is carried out at 1200°C/0.015&#xa0;s<sup>−1</sup>. The forged alloy billet has a round and full appearance morphology. The average fracture toughness of forged alloy is 15.5&#xa0;MPa m<sup>1/2</sup> belonging to a higher level, benefiting from (α<sub>2</sub> + γ) lamellar colonies in the matrix. The fracture toughness is stable when the difference of maximum/minimum value is only 1.6&#xa0;MPa m<sup>1/2</sup>.</p>

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Microstructure Evolution Investigation of Hot Compressed Ti-44Al-4Nb-1W-0.1B Alloy Sample and Fracture Toughness of Forged Alloy Billet

  • 期刊论文

  • 发表日期：

    2025年10月30日

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  • Shanshan Jiang,
  • Shulin Dong,
  • Junchong Gao,
  • Shibing Liu,
  • Yingdong Qu,
  • Ruirun Chen,
  • Guanglong Li,
  • Wei Zhang

摘要

This paper aims to prove that the newly-designed Ti-44Al-4Nb-1W-0.1B alloy has good hot deformation processing capability. It is investigated by hot simulation compression experiment, presented by hot processing mapping and a hot processing window. The microstructure is investigated in detail. For a 1150°C/0.1 s−1 microstructure, α → β transformation occurs. The stress–strain coordination effect and high Schmid factor of B2 are beneficial to hot deformation processing, but shear stress-induced slip causes the sample to crack. For a 1200°C/0.01 s−1 microstructure, β → α transformation occurs. More sufficient DRX occurs to promote hot deformation processing. For a 1250°C/0.001 s−1 microstructure, β → α transformation occurs. The needle-like α2 can be seen, and the preferred growth direction is <0001>α or <hkl0>α, which respectively have a rod shape and a plate shape. For the 1200°C/0.1 s−1 microstructure, DRX, CSL grain boundaries of the α2 phase, and the high Schmid factor of the B2 phase are factors improving hot deformation processing. Actual forging is carried out at 1200°C/0.015 s−1. The forged alloy billet has a round and full appearance morphology. The average fracture toughness of forged alloy is 15.5 MPa m1/2 belonging to a higher level, benefiting from (α2 + γ) lamellar colonies in the matrix. The fracture toughness is stable when the difference of maximum/minimum value is only 1.6 MPa m1/2.