采用Gleeble-3800热模拟试验机对Ti60钛合金进行了热压缩实验,研究该合金在变形温度800~1150℃和应变速率0.001~1 s^(-1)区间内的热变形行为。结果表明:变形温度和应变速率是决定Ti60钛合金流变应力大小的主要因素,随变形温度升高,应变...采用Gleeble-3800热模拟试验机对Ti60钛合金进行了热压缩实验,研究该合金在变形温度800~1150℃和应变速率0.001~1 s^(-1)区间内的热变形行为。结果表明:变形温度和应变速率是决定Ti60钛合金流变应力大小的主要因素,随变形温度升高,应变速率降低,流变应力减小,表现出较强的温度敏感性和应变速率敏感性;随应变增大,合金的流变应力达到最大值,之后趋于平稳,呈现出流变软化特征。采用双曲正弦模型确定合金在800~900℃、950~1020℃和1050~1150℃的变形激活能分别为545.82、732.78和116.19 k J·mol^(-1),进而建立了合金在不同温度区间变形的本构方程,为制定和优化最佳形变加工工艺提供了理论依据。展开更多
Rolling texture and its effect on tensile properties of Ti60 alloy plates were investigated in the present study. The plates were β-rolled at 1070℃ and(α+β)-rolled at 980℃, using uni-directionally rolling(UDR) an...Rolling texture and its effect on tensile properties of Ti60 alloy plates were investigated in the present study. The plates were β-rolled at 1070℃ and(α+β)-rolled at 980℃, using uni-directionally rolling(UDR) and cross-directionally rolling(CDR) processes, respectively.β-rolled plates exhibited weak textures, which were attributed to the dispersive orientations of secondary α during the β→α phase transformation. Strong deformation textures formed in(α+β)-rolled plates as a result of slipping mechanisms: the strong T-type texture in UDR plate was related to {10 1 0}[11 2 0] slipping, while the B-type texture in CDR plate was relevant with {0001}[11 2 0] slip. Strong T-type textures led to anisotropic tensile properties. B-type textures would decrease such an anisotropy. The(α+β)-CDR process was found to be a candidate process for reducing anisotropy of Ti60 alloy plates.展开更多
文摘采用Gleeble-3800热模拟试验机对Ti60钛合金进行了热压缩实验,研究该合金在变形温度800~1150℃和应变速率0.001~1 s^(-1)区间内的热变形行为。结果表明:变形温度和应变速率是决定Ti60钛合金流变应力大小的主要因素,随变形温度升高,应变速率降低,流变应力减小,表现出较强的温度敏感性和应变速率敏感性;随应变增大,合金的流变应力达到最大值,之后趋于平稳,呈现出流变软化特征。采用双曲正弦模型确定合金在800~900℃、950~1020℃和1050~1150℃的变形激活能分别为545.82、732.78和116.19 k J·mol^(-1),进而建立了合金在不同温度区间变形的本构方程,为制定和优化最佳形变加工工艺提供了理论依据。
文摘Rolling texture and its effect on tensile properties of Ti60 alloy plates were investigated in the present study. The plates were β-rolled at 1070℃ and(α+β)-rolled at 980℃, using uni-directionally rolling(UDR) and cross-directionally rolling(CDR) processes, respectively.β-rolled plates exhibited weak textures, which were attributed to the dispersive orientations of secondary α during the β→α phase transformation. Strong deformation textures formed in(α+β)-rolled plates as a result of slipping mechanisms: the strong T-type texture in UDR plate was related to {10 1 0}[11 2 0] slipping, while the B-type texture in CDR plate was relevant with {0001}[11 2 0] slip. Strong T-type textures led to anisotropic tensile properties. B-type textures would decrease such an anisotropy. The(α+β)-CDR process was found to be a candidate process for reducing anisotropy of Ti60 alloy plates.
