基于Arrhennius、Johnson-Cook以及Fields-Backofen本构模型的GH99合金热变形行为  

Hot deformation behavior of GH99 alloy based on Arrhennius,Johnson-Cook,and Fields-Backofen constitutive models

作　　者：王文静子 马鑫 彭雨涵[1,2] 蒋学禹 周舸 张浩宇 张思倩 陈立佳[1,2] WANG Wenjingzi;MA Xin;PENG Yuhan;JIANG Xueyu;ZHOU Ge;ZHANG Haoyu;ZHANG Siqian;CHEN Lijia(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,Liaoning,China;Shenyang Key Laboratory of Advanced Structural Materials and Applications,Shenyang University of Technology,Shenyang 110870,Liaoning,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870 [2]沈阳工业大学沈阳市先进结构材料与应用重点实验室,辽宁沈阳110870

出　　处：《中国冶金》2025年第3期123-134,共12页China Metallurgy

基　　金：沈阳市中青年科技创新人才支持计划(RC220147)。

摘　　要：为研究GH99合金在不同变形条件下的热变形行为,在变形温度为1020~1170℃、应变速率为0.001~1 s~(-1)的变形条件下对GH99合金开展了热压缩模拟试验,基于得到的应力与应变数据,建立Arrhennius、修正的Johnson-Cook及Fields-Backofen本构模型来综合预测该合金的流变应力值,并通过EBSD对变形组织进行表征。结果表明,相比高温条件下,Arrhennius本构模型在中低温条件下预测的应力值与试验值略有偏差;而经修正的Johnson-Cook本构模型能够较好地预测合金在中温条件下的流变应力值;在低温条件下,Fields-Backofen本构模型的预测精度较高。动态再结晶是GH99合金主要的软化机制,随着变形温度的升高以及应变速率的降低,动态再结晶程度和晶粒尺寸逐渐增大。To investigate the hot deformation behavior of the GH99 alloy under various conditions,the hot compression simulation tests were conducted.These tests covered a deformation temperature range from 1020℃to 1170℃and a strain rate range from 0.001 to 1 s-1,based on the obtained stress and strain data,Arrhenius,modified Johnson-Cook,and Fields-Backofen constitutive models were established to comprehensively predict EBSD characterized the rheological stress values of the alloy and the deformation microstructure.The results showed that the Arrhenius constitutive model predicted stress values slightly deviated from experimental values under medium and low-temperature conditions compared to high-temperature conditions.The modified Johnson-Cook constitutive model can effectively predict the rheological stress values of alloys under medium-temperature conditions.Under low-temperature conditions,the Fields-Backofen constitutive model has high prediction accuracy.Dynamic recrystallization is the primary softening mechanism of GH99 alloy.As the deformation temperature increases and the strain rate decreases,the degree of dynamic recrystallization and grain size gradually increase.

关 键 词：GH99合金 热变形行为 本构方程 动态再结晶 真应力-真应变曲线 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG146.2[金属学及工艺—金属材料]