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<p>The cooling rate after forging is one of the decisive factors for the microstructure evolution of near-β titanium alloy. The relationship between β → α transformation characteristics and recrystallization of Ti-55511 alloy during double fire deformation was investigated. The results show that when the cooling rate after forging is 25&#xa0;°C/s, the inhibitory effect of discontinuous dynamic recrystallization (DDRX) degree on β → α is greater than that of continuous dynamic recrystallization (CDRX) during double fire deformation. The discontinuous grain boundary α phase is mostly preferentially precipitated on the grain boundary of the &lt; 123 &gt; <sub>β</sub> special misorientation angle axis when the cooling rate is 0.5&#xa0;°C/s. With the increase of holding time, the α variant of &lt; 11–20 &gt; /80–90° gradually transforms to &lt; -48–43 &gt; /60–70°, and then to &lt; 11–20 &gt; /50–60° twin. The triangular clusters are formed inside the (102)<sub>β</sub> grains when the holding time is 50&#xa0;min, which are composed of three variants of (20–23)<sub>α</sub>, (32–53)<sub>α</sub> and (32–5-2)<sub>α</sub>. With the extension of holding time, the content of short rod-like α phase in the grain gradually increases. The β subgrain boundary is pinned by α precipitation, which inhibits the occurrence of CDRX. The second stage of deformation further promotes the occurrence of strain-induced β → α transformation.</p>

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Interaction between β → α phase transformation precipitation and recrystallization during double-fire deformation of Ti-55511 alloy

  • 期刊论文

  • 发表日期：

    2025年5月30日

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  • Yue Dong,
  • Bingxin Cong,
  • Haozhe Niu,
  • Tonggang Lu,
  • Haoshang Liu,
  • Xiaoyu Li,
  • Yingjie Zhao,
  • Yuyuan Zhao

摘要

The cooling rate after forging is one of the decisive factors for the microstructure evolution of near-β titanium alloy. The relationship between β → α transformation characteristics and recrystallization of Ti-55511 alloy during double fire deformation was investigated. The results show that when the cooling rate after forging is 25 °C/s, the inhibitory effect of discontinuous dynamic recrystallization (DDRX) degree on β → α is greater than that of continuous dynamic recrystallization (CDRX) during double fire deformation. The discontinuous grain boundary α phase is mostly preferentially precipitated on the grain boundary of the < 123 > β special misorientation angle axis when the cooling rate is 0.5 °C/s. With the increase of holding time, the α variant of < 11–20 > /80–90° gradually transforms to < -48–43 > /60–70°, and then to < 11–20 > /50–60° twin. The triangular clusters are formed inside the (102)β grains when the holding time is 50 min, which are composed of three variants of (20–23)α, (32–53)α and (32–5-2)α. With the extension of holding time, the content of short rod-like α phase in the grain gradually increases. The β subgrain boundary is pinned by α precipitation, which inhibits the occurrence of CDRX. The second stage of deformation further promotes the occurrence of strain-induced β → α transformation.