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Ti-25Al-14Nb-2Mo-1Fe合金的熱變形行為及組織演變規律
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-09-13
在Gleeble-3500熱模擬試驗機上對Ti-25Al-14Nb-2Mo-1Fe合金進行等溫恒應變速率壓縮試驗，研究在變形溫度950~1100 ℃、變形速率0.001~1 s-1、最大變形程度為50%條件下合金的熱變形行為，分析變形溫度和變形速率對熱變形組織演變規律的影響。
Ti-25Al-14Nb-2Mo-1Fe合金的熱變形行為及組織演變規律Hot deformation behavior and microstructure evolution of Ti-25Al-14Nb-2Mo-1Fe alloy
在Gleeble-3500熱模擬試驗機上對Ti-25Al-14Nb-2Mo-1Fe合金進行等溫恒應變速率壓縮試驗，研究在變形溫度950~1100 ℃、變形速率0.001~1 s-1、最大變形程度為50%條件下合金的熱變形行為，分析變形溫度和變形速率對熱變形組織演變規律的影響。結果表明：Ti-25Al-14Nb-2Mo-1Fe合金的流變應力對變形溫度和變形速率均較為敏感，其流變應力—應變曲線具有應力峰值、流變軟化和穩態流變特征。變形溫度和變形速率對合金熱變形組織演變影響較大。在變形溫度為950和1050 ℃、變形速率為0.001~1 s-1條件下，隨變形速率的降低，合金中片層組織球化，動態再結晶發生程度增大；在變形速率為0.1 s-1、變形溫度為950~1100 ℃條件下，隨變形溫度的升高，合金中動態再結晶發生程度明顯增大；在變形溫度為950 ℃、變形速率為1 s-1條件下，合金中易形成絕熱剪切帶。
The hot deformation behavior of Ti-25Al-14Nb-2Mo-1Fe alloy was investigated at deformation temperatures between 950 and 1100 ℃ with strain rate between 0.001 and 1 s-1, and the highest reduction of 50% by using isothermal compression test on Gleeble-3500 simulator. The effects of deformation temperature and strain rate on the microstructure evolution during hot working were analyzed. The results show that the flow stress of the alloy is sensitive to the variation of deformation temperature and strain rate. The stress—strain curves exhibit a peak flow stress, flow softening and steady state flow behavior. The microstructure evolution is greatly affected by deformation temperature and strain rate. The degree of lamellar globularization and dynamic recrystallization increases with the strain rate decreasing in the strain rate range of 0.001-1 s-1?at 950 and 1 050 ℃. The degree of dynamic recrystallization increases with deformation temperature increasing in the range of 950-1 100 ℃ at 0.1 s-1. The shear deformation bands are easy to occur at 950 ℃ and 1 s-1, which should be avoided during hot working.
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