热压缩V-5Cr-5Ti合金的Arrhenius本构方程和动态再结晶行为

热压缩V-5Cr-5Ti合金的Arrhenius本构方程和动态再结晶行为

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...

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Bibliographic Details
Published in:中国有色金属学报：英文版 Vol. 25; no. 6; pp. 1889 - 1900
Main Author: 李鱼飞 王震宏 张林英 罗超 赖新春
Format: Journal Article
Language:English
Published: 2015
Subjects:
V-5Cr-5Ti合金
动态再结晶
本构方程
流变应力
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Summary: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。
Bibliography:43-1239/TG
V-5Cr-5Ti alloy; constitutive model; flow stress; dynamic recrystallization
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.
Yu-fei LI, Zhen-hong WANG, Lin-ying ZHANG, Chao LUO, Xin-chun LAI（1. Science and Technology on Surface Physics and Chemistry Laboratory, Mianyang 621907, China; 2. China Academy of Engineering Physics, Mianyang 621900, China）
ISSN:1003-6326