锻压技术

铸态镍基高温合金GH4698热变形行为

英文标题：Hot deformation behavior of as-cast Ni-based superalloy GH4698

作者：王岩谷宇王珏李吉东

分类号：TG335.3

出版年,卷(期):页码：2021,46(11):250-254

摘要：

采用热模拟等研究方法，对不同变形工艺条件下的铸态镍基高温合金GH4698的热变形行为开展了研究，结果表明：在本实验温度范围内，随着变形温度的升高，合金发生完全动态再结晶所需变形量降低；当应变速率为1 s-1时，由1000 ℃下的真应变量0.2（变形量为17%）降低至1200 ℃下的真应变量0.08（变形量为7%）；在高应变速率条件下表现出“加工硬化”、“加工硬化+动态回复”、“加工硬化+动态再结晶”3个阶段的典型特征；在变形温度较高及低应变速率条件下，热激活充足，慢速变形有利于原子扩散与晶界迁移；由应力-应变曲线可知，合金具有较高的变形抗力，通过本构方程计算获得的合金热变形激活能为425 kJ。

The hot deformation behavior of as-cast Ni-base superalloy GH4698 under different deformation conditions was studied by means of thermal simulation. The results show that the deformation amount required for complete dynamic recrystallization of the alloy decreases with the increasing of deformation temperature in the experimental temperature range. When the strain rate is 1 s-1, the true strain decreases from 0.2 (Deformation amount of 17%) at 1000 ℃ to 0.08 (Deformation amount of 7%) at 1200 ℃, and under the condition of high strain rate, it shows the typical characteristics of three stages, such as “work hardening”, “work hardening+dynamic recovery” and “work hardening+dynamic recrystallization”. In addition, at high deformation temperature and low strain rate, the thermal activation is sufficient, and slow deformation is conducive to atomic diffusion and grain boundary migration. It can be seen from the stress-strain curve that the alloy has a higher deformation resistance, and the activation energy of hot deformation for the alloy calculated by the constitutive equation is 425 kJ.

基金项目：

山西省应用基础研究项目(201801D121077)；山西省应用基础研究计划（201901D111460）；山西省关键核心技术和共性技术研发攻关专项（20201102017）

作者简介：王岩（1982-），男，博士，高级工程师，E-mail：15448681@qq.com

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