GH4698合金流动应力及本构方程研究  

Research on flow stress and constitutive equation for GH4698 alloy

作　　者：李中豪 黄亮[1] 班宜杰 温东旭 李建军[1,2] 蒋乔 杨晓利 张健 张志成 Li Zhonghao;Huang Liang;Ban Yijie;Wen Dongxu;Li Jianjun;Jiang Qiao;Yang Xiaoli;Zhang Jian;Zhang Zhicheng(State Key Laboratory of Materials Processing and Die&Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Hubei Huangshi Mold Industrial Technology Research Institute,Huangshi 435001,China;Daye Special Steel Co.,Ltd.,Huangshi 435001,China;Hubei Key Laboratory of High Quality Special Steel,Huangshi 435001,China)

机构地区：[1]华中科技大学材料科学与工程学院材料成形与模具技术国家重点实验室,湖北武汉430074 [2]湖北黄石模具产业技术研究院,湖北黄石435001 [3]大冶特殊钢有限公司,湖北黄石435001 [4]高品质特殊钢湖北省重点实验室,湖北黄石435001

出　　处：《锻压技术》2024年第3期207-218,共12页Forging & Stamping Technology

基　　金：国家重点研发计划(2022YFB3706903,2022YFB3706901);湖北省重点研发计划(2022BAA024)。

摘　　要：采用Gleeble-3500热模拟实验机对GH4698合金进行了热压缩实验,研究了其在变形温度为960~1160℃、应变速率为0.001~10 s^(-1)和变形程度为50%条件下的热变形行为,并基于真应力-真应变数据建立了唯象型和物理基本构模型以预测合金的高温流动行为。结果表明:GH4698合金热压缩过程中流动应力呈先急剧上升后逐渐平缓的特征,流动应力与变形温度呈负相关,与应变速率呈正相关。4种本构模型中,应变补偿型Arrhenius模型的预测精度最高,而改良的Zerilli-Armstrong模型相较于修正的Zerilli-Armstrong模型预测精度更高。The hot compression experiment of GH4698 alloy was carried out by thermal simulation machine Gleeble-3500,and the hot deformation behavior of GH4698 alloy was studied under the deformation temperature of 960-1160℃,the strain rate of 0.001-10 s-1 and the deformation degree of 50%.Then,based on the true stress-true strain data,phenomenological model and physical constitutive model were established to predict the flow behavior of alloy at high temperature.The results show that the flow stress of GH4698 alloy increases sharply at first and then becomes gentle gradually during the process of hot compression.The flow stress is negatively correlated with the deformation temperature and positively correlated with the strain rate.In the four constitutive models,the strain-compensated Arrhenius model has the highest prediction accuracy,and the improved Zerilli-Armstrong model has higher prediction accuracy than the modified Zerilli-Armstrong model.

关 键 词：GH4698合金 热变形行为 本构模型 流动应力 预测精度 

分 类 号：TG132.3[一般工业技术—材料科学与工程]