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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Hot deformation behavior and dynamic recrystallization of GH690 nickel-based superalloy
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Hot deformation behavior and dynamic recrystallization of GH690 nickel-based superalloy

机译：GH690镍高温合金的热变形行为及动态再结晶

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摘要

In this study, hot compression tests of GH690 nickel-based superalloy were carried out on a Gleeble3180 thermo-mechanical simulator with strain rates of 0.1-2s(-1) and the temperature range of 950-1200 degrees C. The true stress-strain curves can reflect the internal relationship between true stress and thermomechanical behavior, and the evolution law of internal microstructure. According to the true stress-strain curves obtained from the tests, it can be obtained that temperature and strain rate have a great influence on the hot deformation behavior of GH690 alloy. To study this effect, the Arrhenius-type constitutive equation is used to characterize the relationship between various factors and predict the stress state. The material constants in the Arrhenius-type constitutive equation were determined by linear fitting of the experimental data, where the activation energy Q is about 425 kJ mol(-1). Furthermore, the microstructure evolution of GH690 alloy was also analyzed, dynamic recrystallization (DRX) critical strain model, Avrami DRX volume fraction model and DRX grain size model were also established. The constitutive model and DRX dynamic model established in the study are imported into the commercial finite element software Deform-3D to verify the established model. The research results show that the prediction results of the numerical simulation agree well with the test. The combination of the established model and numerical simulation is very useful for studying the hot deformation of the alloy. (C) 2020 Elsevier B.V. All rights reserved.
机译：在该研究中，GH690镍基超合金的热压缩试验在GLEEBLE3180热机械模拟器上进行，其应变率为0.1-2s（-1），温度范围为950-1200℃。真正的应力 - 应变曲线可以反映真正应力与热机械行为之间的内部关系，以及内部微观结构的演化法。根据从测试获得的真正应力 - 应变曲线，可以获得温度和应变率对GH690合金的热变形行为有很大影响。为了研究这种效果，Arrhenius型本构式方程用于表征各种因素与预测应力状态之间的关系。通过实验数据的线性拟合确定Arrhenius型本构式方程中的材料常数，其中激活能量Q约为425kJ摩尔（-1）。此外，还分析了GH690合金的微观结构演化，还建立了动态​​再结晶（DRX）临界应变模型，AVRAMI DRX体积分数模型和DRX晶粒尺寸模型。在该研究中建立的本构模型和DRX动态模型导入了商业有限元软件Deform-3D以验证已建立的模型。研究结果表明，数值模拟的预测结果与测试相一致。建立的模型和数值模拟的组合对于研究合金的热变形非常有用。 （c）2020 Elsevier B.v.保留所有权利。

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