塑性应变对21-6-9高强不锈钢管瞬时弹性模量的影响
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摘要
采用反复加载-卸载拉伸实验,研究了21-6-9高强不锈钢管加载和卸载瞬时弹性模量随塑性应变的变化规律,并通过微观组织观察分析了瞬时弹性模量变化的微观机理。结果表明,加载和卸载瞬时弹性模量均随着塑性应变的增大先迅速下降,然后缓慢下降,最后趋于稳定,其稳定值相对于初始弹性模量分别降低了20. 5%和22. 2%;分别建立了加载和卸载瞬时弹性模量与塑性应变之间的函数关系;晶界、晶界碳化物、固溶原子以及形变孪晶与位错交互作用使得位错密度不断增加,导致瞬时弹性模量降低;当塑性应变达到一定程度后,位错密度达到饱和状态,使得瞬时弹性模量趋于稳定。
The variation laws of instantaneous elastic moduli for loading and unloading with plastic strain of 21-6-9 high-strength stainless steel tube were studied by repeated loading and unloading tensile test,and the microscopic mechanisms of instantaneous elastic moduli variation were analyzed by microstructure observation. The results show that with the increase of plastic strain,both the instantaneous elastic moduli of loading and unloading firstly decrease rapidly,then decrease slowly,and finally tend to be stable. Compared with the initial elastic moduli,the stable values of the instantaneous elastic modulus for loading and unloading are reduced by 20. 5% and 22. 2%,respectively. The function between the instantaneous elastic moduli for loading or unloading and plastic strain is established. Grain boundary,grain boundary carbide,solid solution atoms and interaction of twins with dislocation make dislocation density increases continuously,which lead to the decrease of instantaneous elastic moduli. When the plastic strain reaches to a certain degree,the dislocation density gets to saturation state,which makes the instantaneous elastic moduli tend to be stable.
The variation laws of instantaneous elastic moduli for loading and unloading with plastic strain of 21-6-9 high-strength stainless steel tube were studied by repeated loading and unloading tensile test,and the microscopic mechanisms of instantaneous elastic moduli variation were analyzed by microstructure observation. The results show that with the increase of plastic strain,both the instantaneous elastic moduli of loading and unloading firstly decrease rapidly,then decrease slowly,and finally tend to be stable. Compared with the initial elastic moduli,the stable values of the instantaneous elastic modulus for loading and unloading are reduced by 20. 5% and 22. 2%,respectively. The function between the instantaneous elastic moduli for loading or unloading and plastic strain is established. Grain boundary,grain boundary carbide,solid solution atoms and interaction of twins with dislocation make dislocation density increases continuously,which lead to the decrease of instantaneous elastic moduli. When the plastic strain reaches to a certain degree,the dislocation density gets to saturation state,which makes the instantaneous elastic moduli tend to be stable.
引文
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[2]薛新,廖娟.DP钢板非线性滞弹性力学行为及对回弹预测的应用研究[J].塑性工程学报,2018,25(2):234-239.XUE Xin,LIAO Juan.Nonlinear anelastic mechanical behavior of dual-phase steel and its application to springback prediction[J].Journal of Plasticity Engineering,2018,25(2):234-239.
[3]ZHAN M,WANG Y,YANG H,et al.An analytic model for tube bending springback considering different parameter variations of Tialloy tubes[J].Journal of Materials Processing Technology,2016,236:123-137.
[4]KOROLEV A V,KOROLEV A A,VASIN A N.High-efficiency automated line for precise cold rolling of bearing rings[J].Russian Engineering Research,2010,30(7):751-752.
[5]WANG H M,WU P D,WANG J.Modeling inelastic behavior of magnesium alloys during cyclic loading-loading[J].International Journal of Plasticity,2013,47(8):49-64.
[6]余海燕,陈思吉,何泽珍.镁合金板的非弹性回复行为研究[J].塑性工程学报,2017,24(4):1-5.YU Haiyan,CHEN Siji,HE Zezhen.Study on inelastic recovery behavior of magnesium alloy sheet[J].Journal of Plasticity Engineering,2017,24(4):1-5.
[7]YOSHIDA F,UEMORI T,FUJIWARA K.Elastic-plastic behavior of steel sheets under in-plane cyclic tension-compression at large strain[J].International Journal of Plasticity,2002,18(5):633-659.
[8]LIU Y L,ZHU Y X,DONG W Q,et al.Springback prediction model considering the variable Young's modulus for the bending rectangular 3A21 tube[J].Journal of Materials Engineering and Performance,2013,22(1):9-16.
[9]KIM H,KIM C,BARLAT F,et al.Nonlinear elastic behaviors of low and high strength steels in unloading and reloading[J].Materials Science and Engineering A,2013,562:161-171.
[10]徐虹,刘亚楠,于婷,等.双相钢DP780在循环加载-卸载过程中的非弹性回复行为及其微观机理[J].吉林大学学报,2017,47(1):191-198.XU Hong,LIU Yanan,YU Ting,et al.Inelastic recovery behavior and microscopic mechanism of high strength DP780 steel during cyclic loading-unloading[J].Journal of Jilin University,2017,47(1):191-198.
[11]方军.21-6-9高强不锈钢管数控绕弯成形规律研究[D].南京:南京航空航天大学,2015.FANG Jun.Study on forming rules of 21-6-9 high-strength stainless steel tubes in NC rotary draw bending process[D].Nanjing:Nanjing University of Aeronautics and Astronautics,2015.
[12]徐建美.基于有限元模拟的0Cr21Ni6Mn9N不锈钢管数控弯曲截面质量研究[D].南昌:南昌航空大学,2014.XU Jianmei.Simulation of 0Cr21Ni6Mn9N stainless steel tube section quality in NC bending process[D].Nanchang:Nanchang Hangkong University,2014.
[13]许小妹.0Cr21Ni6Mn9N不锈钢管数控弯曲回弹的数值模拟研究[D].南昌:南昌航空大学,2014.XU Xiaomei.Numerical simulation study on springback of0Cr21Ni6Mn9N stainless steel tube NC bending[D].Nanchang:Nanchang Hangkong University,2014.
[14]胡春文,王晓震,金建军.工序间退火温度对0Cr21Ni6Mn9N奥氏体不锈钢管组织与性能的影响[J].机械工程材料,2014,38(12):33-36.HU Chunwen,WANG Xiaozhen,JIN Jianjun.Effects of annealing temperature between processes on microstructure and properties of0Cr21Ni6Mn9N austenitic stainless steel tubes[J].Materials for Mechanical Engineering,2014,38(12):33-36.
[15]GB/T 228.1-2010,金属材料.拉伸试验.第1部分:室温试验方法[S].GB/T 228.1-2010,Metallic materials.Tensile testing.Part 1:Method of test at room temperature[S].
[16]孔韦海,陈学东,闫永超,等.应变强化对022Cr17Ni12Mo2奥氏体不锈钢显微组织和力学行为的影响[J].中国机械工程,2016,27(8):1117-1122.KONG Weihai,CHEN Xuedong,YAN Yongchao,et al.Effect of strain-strengthening on microstructure and mechanics behavior of022Cr17Ni12Mo2 austenitic stainless steel[J].China Mechanical Engineering,2016,27(8):1117-1122.
[17]束德林.工程材料力学性能[M].北京:机械工业出版社,2016.SHU Delin.Mechanical properties of engineering materials[M].Beijing:China Machine Press,2016.
[18]BENITO J A,MANERO J M,JORBA J,et al.Change of elastic modulus of cold-deformed pure iron in a tensile tensile test[J].Metallurgical and Materials Transactions,2005,36(1):3317-3324.