Arrhenius-type constitutive model and dynamic recrystallization behavior of V-5Cr-5Ti alloy during hot compression  

热压缩V-5Cr-5Ti合金的Arrhenius本构方程和动态再结晶行为（英文）

作　　者：李鱼飞[1] 王震宏[2] 张林英[2] 罗超[2] 赖新春[1] 

机构地区：[1]表面物理与化学重点实验室,绵阳621907 [2]中国工程物理研究院,绵阳621900

出　　处：《Transactions of Nonferrous Metals Society of China》2015年第6期1889-1900,共12页中国有色金属学报（英文版）

基　　金：Project(11105127) supported by the National Natural Science Foundation of China

摘　　要：To clarify the high temperature flow stress behavior and microstructures evolution of a V-5Cr-5Ti （mass fraction, %） alloy, the isothermal hot compression tests were conducted in the temperature range of 1423-1573 K with strain rates of 0.01, 0.1, and 1 s-1. The results show that the measured flow stress should be revised by friction and the calculated values of friction coefficient m are in the range of 0.45-0.56. Arrhenius-type constitutive equation was developed by regression analysis. The comparison between the experimental and predicted flow stress shows that the R~ and the average absolute relative error （AARE） are 0.948 and 5.44%, respectively. The measured apparent activation energy Qa is in the range of 540-890 kJ/mol. Both dis-continuous dynamic recrystallization （DDRX） and continuous dynamic recrystallization （CDRX） mechanisms are observed in the deformed alloy, but dynamic recovery （DRV） is the dominant softening mechanism up to a true strain of 1.5.采用等温单向压缩方法研究V-5Cr-5Ti(质量分数,%)合金在温度为1423-1573 K、应变速率为0.01-1 s-1条件下的流变应力和组织演化行为。结果表明,流变应力曲线需进行摩擦力修正,摩擦因数m的测量值为0.45-0.56。采用线性回归方法拟合得到合金的Arrhenius型本构方程,拟合计算应力和实验应力的线性关系,其R2和平均绝对误差值(AARE)分别为0.948和5.44%。表观激活能Qa的取值范围为540-890 k J/mol。连续动态再结晶(CDRX)和不连续动态再结晶(DDRX)机制在热压缩合金中并存。但合金在真应变为1.5的条件下,应变软化的机制仍然以动态回复(DRV)为主。

关 键 词：V-5Cr-5Ti alloy constitutive model flow stress dynamic recrystallization 

分 类 号：TG146.413[一般工业技术—材料科学与工程]