锻压技术

GH4698合金流动应力及本构方程研究

英文标题：Research on flow stress and constitutive equation for GH4698 alloy

作者：李中豪1 黄亮1 班宜杰1 温东旭1 李建军1 2 蒋乔3 4 杨晓利3 4 张健3 4 张志成4

单位：1. 华中科技大学 2. 湖北黄石模具产业技术研究院 3. 大冶特殊钢有限公司 4. 高品质特殊钢湖北省重点实验室

分类号：TG132.3

出版年,卷(期):页码：2024,49(3):207-218

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.

基金项目：

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

作者简介：李中豪（1999-），男，硕士研究生，E-mail：M202171017@hust.edu.cn；通信作者：黄亮（1981-），男，博士，教授，E-mail：huangliang@hust.edu.cn

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