摘要
通过热压缩试验对Inconel 625合金的热变形行为进行了测试。结果显示真应力-真应变曲线的斜率随着温度的降低和应变速率的升高而增大。这表明温度,应变和应变速率之间通过一种复杂的交互作用共同对应变硬化和再结晶产生影响。用Johnson-Cook模型建立的本构方程由于忽略了这个交互作用而不能很好地预测此合金的应力-应变关系。为此对Johnson-Cook模型做了改进。新的模型考虑了温度,应变和应变速率的交互作用。对比结果表明:修改的Johnson-Cook模型的预测值和实验值符合得很好。
The hot deformation behavior of Inconel 625 alloy was investigated by compression tests. The results show that the slope of the true stress-true strain curve increases with the drop of the temperature and the rise of strain rate, indicating a complex interactive influence of temperature, strain and strain rate on the strain hardening and recrystallization. However, the constitutive equation built by Johnson-Cook model fails to predict precisely the stress-strain relation of Inconel 625 alloy due to the ignorance of the interaction Accordingly, the JC model was modified by taking into account of the interactive effects of temperature, strain and strain rate. The comparison between the experimental data and the predicting value shows that the modified JC model fits accurately
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2013年第8期1679-1684,共6页
Rare Metal Materials and Engineering
