新型优质GH738合金热变形过程动态再结晶模型的建立

doi:10.3901/JME.2022.10.059

机械工程学报 ›› 2022, Vol. 58 ›› Issue (10): 59-67.doi: 10.3901/JME.2022.10.059

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新型优质GH738合金热变形过程动态再结晶模型的建立

郭晶, 牛文龙, 马思文, 张麦仓

北京科技大学材料科学与工程学院北京 100083

收稿日期:2021-06-05 修回日期:2021-09-09 出版日期:2022-05-20 发布日期:2022-07-07
通讯作者: 张麦仓(通信作者)，男，1967年出生，博士，副教授，硕士研究生导师。主要研究方向为高性能结构材料成型控制及构件服役性能分析。E-mail：mczhang@ustb.edu.cn
作者简介:郭晶，女，1992年出生。主要研究方向为镍基高温合金的动态再结晶模型及机理。E-mail：gj_tyut@163.com
基金资助:
国家自然科学基金(51971016)和科技部重大专项(2021YFB3700403)资助项目。

Dynamic Recrystallization Model Analysis of New Type High Quality GH738 Alloy during Its Hot Deformation Processes

GUO Jing, NIU Wenlong, MA Siwen, ZHANG Maicang

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083

Received:2021-06-05 Revised:2021-09-09 Online:2022-05-20 Published:2022-07-07

摘要/Abstract

摘要： 采用MTS810-25T低周疲劳试验机对新型优质GH738合金进行热压缩试验,分析该合金在不同初始晶粒尺寸(42~340μm)、变形温度(1020~1100℃)、应变速率(0.01~1 s^-1)和应变量(0.15~0.70)条件下的动态再结晶(Dynamic recrystallization,DRX)组织演化规律,并利用Avrami方程构建了该合金的动态再结晶模型,进而结合DEFORM软件及热压缩试验进行验证。结果表明,随着初始晶粒尺寸的减小,应变速率的降低,变形温度升高,应变量增加,动态再结晶的体积分数增加;有限元结果及验证试验均表明,建立的新型优质GH738合金的动态再结晶临界应变模型、体积分数模型以及晶粒尺寸模型,具有良好的预测精度。

关键词: 新型优质GH738合金, 热变形, 组织演化, 动态再结晶模型

Abstract: Series hot compression tests of the new type alloy of high-quality GH738 were carried out under low-cycle fatigue tester of MTS810-25T, the microstructure evolution of dynamic recrystallization(DRX) for this alloy under different hot deformation conditions, including initial grain sizes (range of 42-340 μm), temperature (range of 1 020-1 100 ℃), strain rate (range of 0.01-1 s^?1), and engineering strain (range of 0.15-0.70) was systematically investigated. Then, series Avrami-type model of its dynamic recrystallization was established. The verification of the dynamic recrystallization model by numerical simulation using DEFORM software and typical compression test was conducted. The results show as follows: The volume fraction for the new type alloy of high-quality GH738 during dynamic recrystallization processes increases with the decrease of initial grain size, the decrease of strain rate, and increasing of the deformation temperature and strain. Based on the quantitative metallography and nonlinear fitting method， the critical strain model, volume fraction model and grain size model of the new type alloy of high-quality GH738 were established. Coupled the above established dynamic recrystallization model of the new type alloy of high-quality GH738 in finite analysis software of DEFORM, and contracted the simulation results to typical compression test, indicate that the dynamic recrystallization model for this alloy can provide effective prediction for microstructure control in actual hot working process.

Key words: the new type alloy of high-quality GH738, hot deformation, microstructure evolution, dynamic recrystallization model

中图分类号:

TG132

郭晶, 牛文龙, 马思文, 张麦仓. 新型优质GH738合金热变形过程动态再结晶模型的建立[J]. 机械工程学报, 2022, 58(10): 59-67.

GUO Jing, NIU Wenlong, MA Siwen, ZHANG Maicang. Dynamic Recrystallization Model Analysis of New Type High Quality GH738 Alloy during Its Hot Deformation Processes[J]. Journal of Mechanical Engineering, 2022, 58(10): 59-67.

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新型优质GH738合金热变形过程动态再结晶模型的建立

Dynamic Recrystallization Model Analysis of New Type High Quality GH738 Alloy during Its Hot Deformation Processes

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