高温、高应变率下9Cr18Mo不锈钢流变行为及本构模型研究  

Rheological behaviours and constitutive models of 9Cr18Mo stainless steel at high temperature and high strain rate

作　　者：贾海深[1] 沈建成[2] 罗文翠[2] 易湘斌[1,2] Jia Haishen;Shen Jiancheng;Luo Wencui;Yi Xiangbin(Key Laboratory of Green Cutting Technology and Application in Gansu Province,Lanzhou Institute of Technology,Lanzhou 730050,Gansu,China;Gansu Provincial Precision Machining Technology and Equipment Engineering Research Center,Lanzhou Institute of Technology,Lanzhou 730050,Gansu,China)

机构地区：[1]兰州工业学院,绿色切削加工技术及应用甘肃省高校重点实验室,甘肃兰州730050 [2]兰州工业学院,甘肃省精密加工技术及装备工程研究中心,甘肃兰州730050

出　　处：《钢铁钒钛》2023年第5期158-166,175,共10页Iron Steel Vanadium Titanium

基　　金：甘肃省重点人才项目(甘组通字[2022]77号);甘肃省科技计划项目—重点研发(22YF7FA132);甘肃省产业支撑计划项目(2021CYZC-52);甘肃省高等学校创新基金项目(2021A-156、2021B-319);兰州工业学院“启智”人才培养计划(2018QZ-03)。

摘　　要：在UTM5305万能试验机和剖分式Hopkinson压杆试验装置上,对9Cr18Mo不锈钢进行了压缩试验研究,获得准静态(应变率为0.001~0.1 s^(-1))及动态下(温度范围为25~650℃,应变率范围为800~4000 s^(-1))的应力—应变曲线关系。由获取的应力—应变曲线,探讨了其高温度、高应变率下的流变行为。依据所得到的试验数据,对其进行了J-C、P-L两种本构模型参数的识别,并对比分析了两种本构模型的相关系数(R)和平均相对误差(AARE)。结果表明,9Cr18Mo不锈钢具有应变率敏感性和显著的温度软化效应,即其流动应力随着应变率的增加而增加,随着温度的升高而显著下降。两种本构模型的相关系数(R)分别为0.9697、0.9896,平均相对误差(AARE)分别为2.77%、1.85%,即P-L本构模预测精度要高于J-C本构模型,更能精确地描述其高温、高应变率下的流变行为。The compression tests of 9Cr18Mo stainless steel were conducted by using the UTM5305 universal testing machine and the split Hopkinson pressure bar(SHPB)test device.In this way,the stress–strain curves pertaining to quasi-static(strain rate:0.001-0.1 s^(-1))and dynamic(temperature:25-650℃and strain rate:800-4000 s^(-1))states were attained.According to the stress-strain curves,the rheological behaviours of 9Cr18Mo stainless steel at high temperature and high strain rate were discussed.Based on the testing data,the parameters of two constitutive models(Johnson-Cook(J-C)and PowerLaw(P-L))of 9Cr18Mo stainless steel were identified,and the correlation coefficients(R)and average absolute relative errors(AAREs)of the two constitutive models were compared.The results showed that 9Cr18Mo stainless steel presents strain rate sensitivity and significant thermal softening.That is the flow stress of 9Cr18Mo stainless steel increases with strain rate while significantly decreases with increasing temperature.The R values are 0.9697 and 0.9896,while the AAREs of two constitutive models are 2.77%and 1.85%,respectively.Hence,the P-L constitutive model shows a higher prediction accuracy which can describe the rheological behaviours of 9Cr18Mo stainless steel at high temperature and high strain rate more precisely compared with the J-C constitutive model.

关 键 词：9Cr18Mo不锈钢 流变行为 本构模型 相关性系数 平均相对误差 

分 类 号：TF76[冶金工程—钢铁冶金] O347.3[理学—固体力学]