工业纯钛TA2的室温压缩蠕变预测模型
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摘要
在室温下对工业纯钛TA2进行恒应力(200～550 MPa)压缩蠕变试验和恒应变速率(1×10-5,5×10-5,5×10-4 s-1)压缩试验,采用幂律方程(蠕变方程)描述了其压缩蠕变行为,利用修正的Arrhenius方程(压缩本构方程)描述了压缩流变行为;建立了压缩蠕变方程参数和压缩本构方程参数的关系式,利用蠕变临界应力修正后,得到基于压缩试验数据的室温压缩蠕变预测模型,并进行了试验验证。结果表明:工业纯钛TA2的室温压缩蠕变临界应力为252MPa;修正后的Arrhenius方程可以很好地表征工业纯钛TA2的室温压缩变形行为;采用室温压缩蠕变预测模型计算得到的蠕变曲线与试验曲线的相对误差均在10%以内,模型较准确。
Compression creep tests under constant stresses(200-550 MPa)and compression tests at constant strain rates(1×10-5,5×10-5,5×10-4 s-1)were conducted on commercially pure titanium TA2 at room temperature.The compression creep behaviour was described by power law equation(creep equation).The compression rheological behaviour was described by modified Arrhenius equation(compression constitutive equation).The relation between parameters of comperssion creep equation and compression constitutive equation was established and modified by creep critical stress.The prediction model for room temperature compression creep was obtained on the basis of compression test data and verified by expriments.The results show that the compression creep critical stress at room temperature of commercially pure titanium TA2 was 252 MPa.The room temperature compression defromation behaviour of commercially pure titanium TA2 were expressed well by the modified Arrhenius equation.The relative errors between the creep curves by the prediction model for room temperature compression creep and the tested curves were all below 10%,indicating that the model was accurate.
Compression creep tests under constant stresses(200-550 MPa)and compression tests at constant strain rates(1×10-5,5×10-5,5×10-4 s-1)were conducted on commercially pure titanium TA2 at room temperature.The compression creep behaviour was described by power law equation(creep equation).The compression rheological behaviour was described by modified Arrhenius equation(compression constitutive equation).The relation between parameters of comperssion creep equation and compression constitutive equation was established and modified by creep critical stress.The prediction model for room temperature compression creep was obtained on the basis of compression test data and verified by expriments.The results show that the compression creep critical stress at room temperature of commercially pure titanium TA2 was 252 MPa.The room temperature compression defromation behaviour of commercially pure titanium TA2 were expressed well by the modified Arrhenius equation.The relative errors between the creep curves by the prediction model for room temperature compression creep and the tested curves were all below 10%,indicating that the model was accurate.
引文
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[3]GU Y,ZENG F,QI Y,et al.Tensile creep behavior of heattreated TC11titanium alloy at 450-550℃[J].Materials Science and Engineering:A,2013,575:74-85.
[4]MISHRA H,SATYANARAYANA D V V,NANDY T K,et al.Effect of trace impurities on the creep behavior of a nearαtitanium alloy[J].Scripta Materialia,2008,59(6):591-594.
[5]LV D,XU J,DING W,et al.Tool wear in milling Ti40burnresistant titanium alloy using pneumatic mist jet impinging cooling[J].Journal of Materials Processing Technology,2016,229:641-650.
[6]王琪,文智,江川,等.TA15钛合金的高温蠕变行为[J].粉末冶金材料科学与工程,2014(2):171-176.
[7]PRASAD K,SARKAR R,GHOSAL P,et al.Tensile and creep properties of thermomechanically processed boron modified Timetal 834titanium alloy[J].Materials Science and Engineering:A,2011,528(22/23):6733-6741.
[8]ADENSTEDT H.Creep of titanium at room temperature[J].Metal Progress,1949,56:258-262.
[9]马秋林,张莉,徐宏,等.工业纯钛TA2室温蠕变第1阶段特性研究[J].稀有金属材料与工程,2007,36(1):11-14.
[10]张莉,徐宏,马秋林,等.工业纯钛TA2的低温蠕变行为[J].稀有金属材料与工程,2008,37(12):2114-2117.
[11]彭剑,周昌玉,代巧,等.工业纯钛中低温蠕变的等时应力应变曲线[J].稀有金属材料与工程,2016,45(2):346-352.
[12]SANDSTRM R.Basic model for primary and secondary creep in copper[J].Acta Materialia,2012,60(1):314-322.
[13]RUSINKO A,RUSINKO K.Plasticity and creep of metals[M].Heidelberg:Springer-Verlag Berlin Heidelberg,2011.
[14]SUN F,GU Y F,YAN J B,et al.Phenomenological and microstructural analysis of intermediate temperatures creep in a Ni-Fe-based alloy for advanced ultra-supercritical fossil power plants[J].Acta Materialia,2016,102:70-78.
[15]罗皎,李淼泉,李宏,等.TC4钛合金高温变形行为及其流动应力模型[J].中国有色金属学报,2008,18(8):1395-1401.
[16]陈明和,傅桂龙,余亚平,等.等应变速率拉伸测m值的方法[J].精密成形工程,1996(3):39-40.