Ti_2AlNb基合金热变形行为研究
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摘要
在Gleeble-3500热模拟机上对Ti_2AlNb基合金进行了等温恒应变速率压缩实验,获得了该合金在应变速率为0.01~10 s-1、变形温度为900~1100℃时的流动应力,分析了热变形参数对流动应力的影响规律,计算了该合金的激活能。采用多元线性回归法建立了该合金的本构方程。误差分析表明,该本构方程具有较高的精度,可为Ti_2AlNb基合金在锻造过程中的数值模拟和制定热加工工艺参数提供理论依据。
The isothermal constant strain rate compression experiment of Ti_2AlNb-based alloy was performed on Gleeble-3500 hot simulator, and the flow stresses of the alloy at 900-1100 ℃and the strain rate of 0.01-10 s-1were obtained.The effect laws of hot-deformation parameters on flow stress were analyzed, and the activation energy of the alloy was computed. The constitutive equation of the alloy was established by multiple linear regression method. The error analysis shows that the constitutive equation has a high precision, which can provide theoretical basis for numerical simulation and constituting the hot processing parameters during the forging process of Ti_2AlNb-based alloy.
The isothermal constant strain rate compression experiment of Ti_2AlNb-based alloy was performed on Gleeble-3500 hot simulator, and the flow stresses of the alloy at 900-1100 ℃and the strain rate of 0.01-10 s-1were obtained.The effect laws of hot-deformation parameters on flow stress were analyzed, and the activation energy of the alloy was computed. The constitutive equation of the alloy was established by multiple linear regression method. The error analysis shows that the constitutive equation has a high precision, which can provide theoretical basis for numerical simulation and constituting the hot processing parameters during the forging process of Ti_2AlNb-based alloy.
引文
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[14]Seshacharyulu T,Medeiros S C,Frazier W G.Hot working of commercial Ti-6Al-4V with an equiaxedα-βmicrostructure:materials modeling considerations[J].Materials Science&Engineering A,2000,284:184-194.
[2]Kumpfert J.Intermetallic alloys based on orthorhombic titanium aluminide[J].Advanced Engineering Materials,2001,3(11):851-864.
[3]Wu B,Zinkevich M,Aldinger F,et al.Prediction of the ordering behaviours of the orthorhombic phase based on Ti2Al Nb alloys by combining thermodynamic model with abinitio calculation[J].Intermetallics,2008,16:42-51.
[4]Emura S,Tsuzaki K,Tsuchiya K.Improvement of room temperature ductility for Mo and Fe modified Ti2Al Nb alloy[J].Materials Science and Engineering A,2010,528:355-362.
[5]司玉锋,孟丽华,陈玉勇.Ti2Al Nb基合金的研究进展[J].宇航材料工艺,2006,36(3):10-13.
[6]Semiatin S L,Seetharaman V,Weiss I.Flow behavior and globularization kinetics during hot working of Ti-6Al-4V witha colony alpha microstructure[J].Materials Science&Engineering A,1999,263(2):257-271.
[7]Prasad Y V R K.Recent advances in the science of mechanical processing[J].Indian Journal of Technology,1990,28:435-451.
[8]罗子健,杨旗,姬婉华.考虑变形热效应的本构关系建立方法[J].中国有色金属学报,2000,10(6):804-808.
[9]林启权,张辉,彭大暑,等.2519铝合金热压缩变形流变应力行为[J].热加工工艺,2002,31(3):1-3.
[10]刘杰,李落星,李光耀,等.AZ61镁合金高温变形应力修正及本构方程的建立[J].热加工工艺,2007,36(17):1-4.
[11]Rao K P.Development of constitutive relationships using compression testing of a medium carbon steel[J].Journal of Engineering Materials&Technology,1992,114(1):116-123.
[12]Sellars C M,Mctegart W J.On the mechanism of hot deformation[J].Acta.Metallurgica,1966,14(9):1136-1138.
[13]王洋,尤逢海,朱景川,等.TA15合金热变形行为研究[J].机械工程材料,2006,30(11):63-65.
[14]Seshacharyulu T,Medeiros S C,Frazier W G.Hot working of commercial Ti-6Al-4V with an equiaxedα-βmicrostructure:materials modeling considerations[J].Materials Science&Engineering A,2000,284:184-194.