Nimonic 80A高温合金静态再结晶行为元胞自动机模拟  

Cellular automaton simulation of static recrystallization behavior of Nimonic 80A superalloy

作　　者：徐倩虹 张驰[1] 张立文[1] 申文飞 唐晓乐 XU Qian-hong;ZHANG Chi;ZHANG Li-wen;SHEN Wen-fei;TANG Xiao-le(School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学材料科学与工程学院

出　　处：《塑性工程学报》2018年第6期236-243,共8页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51604058)

摘　　要：为研究Nimonic 80A高温合金双道次热压缩变形过程中静态再结晶组织结构演变特征,基于热加工过程中加工硬化、动态回复、静态回复、静态再结晶等物理冶金学原理,建立了二维元胞自动机模型。模型给出了静态回复系数、孕育期、晶界迁移速率等参数的变化方程。为了确定各方程中的参数,进行了一系列双道次热压缩实验。模拟结果表明,随着间隙时间和温度的增加,静态再结晶晶粒尺寸和再结晶分数均显著增加。其中,随着间隙时间的增加,未再结晶部分的静态回复作用增强,新晶粒的长大驱动力逐渐减小,静态再结晶分数增加的速率缓慢降低直至趋于0。实验结果证实,该元胞自动机模型能有效预测Nimonic 80A高温合金热变形过程中的静态再结晶行为。In order to study the microstructure evolution characteristics of static recrystallization in Nimonic 80 A superalloy during twopass thermal-compression deformation,a two-dimensional cellular automaton model was established based on the physical metallurgy principles of work hardening,dynamic recovery,static recovery and static recrystallization. The change equations of static recovery coefficient,incubation period and grain boundary migration rate were given. In order to determine the parameters in the equations,a series of two-pass thermal-compression experiments were carried out. The simulation results show that the static recrystallization grain size and recrystallization fraction increase significantly with the increase of interval time and temperature. With the increase of interval time,the static recovery effect of the non-recrystallized part is enhanced,and the growth driving force of the new grain decreases gradually,the rate of static recrystallization fraction decreases slowly until it approaches 0. The experimental results show that the cellular automaton model can effectively predict the static recrystallization behavior of Nimonic 80 A superalloy during thermal deformation.

关 键 词：元胞自动机 镍基高温合金 静态再结晶 间隙时间 温度 

分 类 号：TG132.32[一般工业技术—材料科学与工程]