TC18合金动态力学行为研究
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摘要
为分析和表征TC18合金的动态力学行为与性能,采用电子万能试验机对TC18合金进行了常温准静态压缩实验,得到合金在准静态下的实验数据,根据实验数据,选用分离式Hopkinson压杆对TC18合金在温度分别为298、523、773和1 023K,应变率分别为500、1 000和1 500s~(-1)下进行动态力学性能实验,得到了合金在高温动态压缩条件下的应力-应变曲线,分析了温度和应变率对TC18合金动态力学行为的影响。结果表明,在同一温度下,随着应变速率的增加,TC18合金的塑性应变明显增大,表现出一定的应变率增塑效应;在同一应变率下,随着温度的增加,材料的流变应力有显著的下降,表现出明显的热软化效应;在高应变率下的塑性变形过程中,应变率强化和热软化作用同时进行,当温度超过773K时,热软化作用大于应变率强化作用。
In order to analyze and characterize the dynamic mechanical behavior and properties of TC18 alloy,the normal temperature quasi-static compression experiment was performed on the TC18 alloy using an electronic universal testing machine to obtain the experimental data of the alloy under quasi-static condition.According to the experimental data,the dynamic mechanical properties of TC18 alloy at 298,523,773,and 1 023 Kwith strain rates of 500,1 000 and 1 500 s~(-1) were tested respectively using a Split Hopkinson Pressure Bar(SHPB).The stressstrain curves of the alloy under dynamic compression at high temperature were obtained.And the effects of temperature and strain rate on the dynamic mechanical behavior of TC18 alloy were analyzed.The results showed that the plastic strain of TC18 alloy increased obviously with the increase of strain rate at the same temperature,showing a certain strain-rate plasticizing effect.The flow stress of TC18 alloy decreased significantly with the increase of temperature under the same strain rate,and shows obvious thermal softening effect.The strain rate strengthening effect and thermal softening effect were carried out simultaneously in the process of plastic deformation at high strain rate.The thermal softening effect was greater than the strain-rate strengthening effect when the temperature exceeds 773 K.
In order to analyze and characterize the dynamic mechanical behavior and properties of TC18 alloy,the normal temperature quasi-static compression experiment was performed on the TC18 alloy using an electronic universal testing machine to obtain the experimental data of the alloy under quasi-static condition.According to the experimental data,the dynamic mechanical properties of TC18 alloy at 298,523,773,and 1 023 Kwith strain rates of 500,1 000 and 1 500 s~(-1) were tested respectively using a Split Hopkinson Pressure Bar(SHPB).The stressstrain curves of the alloy under dynamic compression at high temperature were obtained.And the effects of temperature and strain rate on the dynamic mechanical behavior of TC18 alloy were analyzed.The results showed that the plastic strain of TC18 alloy increased obviously with the increase of strain rate at the same temperature,showing a certain strain-rate plasticizing effect.The flow stress of TC18 alloy decreased significantly with the increase of temperature under the same strain rate,and shows obvious thermal softening effect.The strain rate strengthening effect and thermal softening effect were carried out simultaneously in the process of plastic deformation at high strain rate.The thermal softening effect was greater than the strain-rate strengthening effect when the temperature exceeds 773 K.
引文
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[2]张乐,刘莹莹,薛希豪,等.显微组织对TC18合金裂纹扩展速率的影响[J].稀有金属,2018,42(6):594-600.ZHANG Le,LIU Yingying,XUE Xihao,et al.Crack growth rate of TC18alloy with different microstructure[J].Chinese Journal of Rare Metals,2018,42(6):594-600.
[3]LI C W,XIE H,MAO X N,et al.High temperature deformation of TC18 titanium alloy[J].Rare Metal Materials and Engineering,2017,46(2):326-332.
[4]沙爱学,李兴无,王庆如.变形量对TC18钛合金力学性能的影响[J].材料工程,2014,(11):34-37.SHA Aixue,LI Xingwu,WANG Qingru.Influence of deforming amount on mechanical properties of TC18alloy[J].Journal of Materials Engineering,2014,(11):34-37.
[5]JIA B H,SONG W D,TANG H P,et al.Hot deformation behavior of TC18 titanium alloy[J].Thermal Science,2013,17(5):1523-1528.
[6]贾百芳,杨义,周伟,等.TC18钛合金室温拉伸性能与热处理制度的关系[J].中国有色金属学报,2010,20(增刊1):587-592.JIA Baifang,YANG Yi,ZHOU Wei,et al.Relationship between heat treatment process and room-temperature tensile properties of TC18 titanium alloy[J].The Chinese Journal of Nonferrous Metals,2010,20(s1):587-592.
[7]王媛,董健,王德琴.热处理工艺对TC18合金锻件组织和性能的影响[J].金属热处理,2013,38(8):93-95.WANG Yuan,DONG Jian,WANG deqin.Effects of heat treatment process on microstructure and mechanical properties of TC18 alloy forged piece[J].Heat Treatment of Metals,2013,38(8):93-95.
[8]彭雯雯,曾卫东,张尧武,等.TC18钛合金氧化色与力学性能关系研究[J].稀有金属材料与工程,2013,42(2):358-361.PENG Wenwen,ZENG Weidong,ZHANG Yaowu,et al.Relationship between color of oxidation layer and mechanical properties of TC18titanium alloy[J].Rare Metal Materials and Engineering,2013,42(2):358-361.
[9]冉春,陈鹏万,李玲,等.中高应变率条件下TC18钛合金动态力学行为的实验研究[J].兵工学报,2017,38(9):1723-1728.RAN Chun,CHEN Pengwan,LI Ling,et al.Experimental research on dynamic mechanical behavior of TC18 titanium alloy under medium and high strain rates[J].Acta Armamentarii,2017,38(9):1723-1728.
[10]颜孟奇,沙爱学,李凯,等.退火温度对TC18钛合金组织及织构演变规律的影响[J].稀有金属材料与工程,2017,46(增刊1):156-160.YAN Mengqi,SHA Aixue,LI Kai,et al.Effect of annealing temperature on microstructure and texture evolution of TC18 titanium alloy[J].Rare Metal Materials and Engineering,2017,46(s1):156-160.
[11]贾宝华,刘思勇,李革.国内TC18钛合金本构关系研究进展[J].钛工业进展,2017,34(4):9-12.JIA Baohua,LIU Siyong,LI Ge.Research progress on constitutive relation of TC18titanium alloy in China[J].Titanium Industry Progress,2017,34(4):9-12.
[12]SUN S Y,LV W J.Microstructure and mechanical properties of TC18 titanium alloy[J].Rare Metal Materials and Engineering,2016,45(5):1138-1141.
[13]JIA B H,SONG W D,TANG H P,et al.Hot deformation behavior and constitutive model of TC18alloy during compression[J].Rare Metals.2014,33(4):383-389.
[14]贾宝华,刘思勇,李革,等.基于J-C模型的TC18钛合金动态本构方程构建[J].钛工业进展,2018,35(5):9-13.JIA Baohua,LIU Siyong,LI Ge,et al.Establishment of dynamic constitutive equation for TC18titanium alloy based on J-C model[J].Titanium Industry Progress,2018,35(5):9-13.
[15]GB/T 7314-2017.金属材料室温压缩试验方法[S].北京:中国标准出版社,2017.GB/T7314-2017.Test method for compression of metal materials at room temperature[S].Beijing:Standards Press of China,2017.
[16]高宁,朱志武.铝合金应变率效应综述及其机理研究[J].应用数学和力学,2014,35(增刊1):208-212.GAO Ning,ZHU Zhiwu.Study on the strain rate effects and mechanisms for aluminum alloys[J].Applied Mathematics and Mechanics,2014,35(s1):208-212.