摘要
通过热压缩实验研究了经均匀化处理后的GH4141合金在变形温度为1000~1200℃和应变速率为0.01-5 s^(-1)条件下的热变形行为,构建了GH4141合金的热变形本构方程,并分析了热变形过程中微观组织的演变规律。结果表明,GH4141合金的峰值应力和峰值应变均随着变形温度的升高和应变速率的减小而显著降低。当变形温度为1100~1150℃时,由于动态再结晶的发生,动态软化逐渐与加工硬化达到平衡,流变应力基本不变,真应力-真应变曲线趋于平稳状态。基于Zener-Hollomon参数的双曲正弦模型可以很好地描述GH4141合金热变形过程中峰值应力与变形温度和应变速率的关系。GH4141合金热变形过程中的再结晶程度随着变形温度升高、应变速率减小和变形量增加而增加。当变形温度≥1100℃,应变速率为0.01~0.1 s^(-1),变形量≥50%时,合金发生完全动态再结晶。
The hot deformation behavior of GH4141 alloy after homogenization treatment was studied by hot compression experiments at the deformation temperature of 1000-1200℃and strain rate of 0.01-5 s^(-1).The hot deformation constitutive equation of GH4141 alloy was established,and the microstructure evolution during hot deformation process was analyzed.The results show that the peak stress and peak strain of GH4141 alloy decrease significantly with the increase of deformation temperature and the decrease of strain rate.When the deformation temperature is 1100-1150℃,due to the occurance of dynamic recrystallization,the dynamic softening gradually reaches equilibrium with work hardening,flow stress is basically unchanged,and the true stress-true strain curves tend to a stable state.The hyperbolic sine model based on Zener-Hollomon parameters can well describe the relationship between the peak stress and the de-formation temperature and strain rate during hot deformation process of GH4141 alloy.The recrystallization degree of GH4141 alloy dur-ing hot deformation process increases with the increase of deformation temperature,the decrease of strain rate and the increase of de-formation amount.The complete dynamic recrystallization occurs when the temperature is more than 1100℃,the strain rate is 0.01-0.1 s^(-1),and the deformation amount is more than 50%.
作者
肖东平
付建辉
陈琦
周扬
XIAO Dong-ping;FU Jian-hui;CHEN Qi;ZHOU Yang(Chengdu Insititute of Advanced Metallic Material Technology and Industry Co.,Ltd.,Chengdu 610000,China;State Key Laboratory of Metal Material for Marine Equipment and Application,Anshan 114009,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2022年第9期157-164,共8页
Journal of Plasticity Engineering
关键词
GH4141合金
热变形
本构方程
再结晶
GH4141 alloy
hot deformation
constitutive equation
recrystallization
