摘要
借助MTS810-25T低周疲劳试验机在不同变形温度下对锻态GH4151合金进行热变形试验以研究变形温度对合金组织演变以及动态再结晶的影响。结果表明,GH4151合金热变形过程真应力应变曲线中的峰值应力随变形温度降低和应变速率增大而增加。基于真应力应变曲线,经线性拟合获得锻态GH4151合金的Arrhenious本构方程,能够较好地描述锻态GH4151合金的热压缩变形规律,同时得到合金的热变形激活能Q=218.09 kJ/mol。微观组织分析表明,变形温度较低时,合金的动态再结晶中以γ′相诱发动态再结晶和在晶界弓出形核的不连续动态再结晶机制为主。变形温度升高,动态再结晶形核以不连续动态再结晶和以亚晶旋转聚合为特征的连续动态再结晶机制主导。
The effect of deformation temperature on microstructure evolution and dynamic recrystallization of wrought GH4151 alloy was studied by MTS810-25T low cycle fatigue testing machine at different deformation temperatures.The results show that the peak stress in the true stress-strain curve of GH4151 alloy increases with the decrease of deformation temperature and the increase of strain rate.Based on the true stress-strain curve,the Arrhenious constitutive equation of wrought GH4151 alloy is obtained by linear fitting,which can well describe the hot compression deformation law of wrought GH4151 alloy and obtain the activation energy of hot deformation Q=218.09 kJ/mol.Microstructure analysis shows that the continuous dynamic recrystallization induced byγ'phase and discontinuous dynamic recrystallization with bulging of the original grain boundaries are mainly when in the low temperature.With the increase of deformation temperature,the dynamic recrystallization nucleation is dominated by discontinuous dynamic recrystallization and continuous dynamic recrystallization characterized by subcrystalline rotational polymerization.
作者
孙悦
牛文龙
张麦仓
SUN Yue;NIU Wenlong;ZHANG Maicang(School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2024年第8期143-153,共11页
Journal of Mechanical Engineering
基金
国家自然科学基金资助项目(51971016)。
关键词
GH4151镍基高温合金
热压缩变形
本构方程
热加工图
动态再结晶
GH4151 nickel-based superalloy
hot compression deformation
constitutive equation
hot processing map
dynamic recrystallization
