钴基高温合金GH5605热压缩变形行为

来源期刊:中国有色金属学报2021年第4期

论文作者:张兵 赵芬芬 陈韩锋 杨艳 马艳恒 祁凯

文章页码:879 - 890

关键词:钴基高温合金;热变形行为;本构模型;热加工图;显微组织

Key words:cobalt-based superalloy; hot compression deformation; constitutive modeling; processing map; microstructure

摘    要:利用Gleeble-3500热模拟试验机对真空感应(VIM)+电渣重熔(ESR)所得的GH5605合金铸锭进行热压缩实验,研究其在变形温度为 950~1200 ℃、应变速率为0.001~10 s-1、真应变为0.65时的热变形行为。结果表明:铸态GH5605合金的真应力-应变曲线属于加工硬化+动态回复型,分为3个阶段,即Ⅰ剧烈加工硬化阶段、Ⅱ平缓加工硬化阶段、Ⅲ稳态流变阶段。建立的Arrhenius本构方程相关系数(Rr)和平均相对误差(δ)分别为0.95和11.99%,结合热加工图和变形组织分析得出GH5605合金良好的加工区域为变形温度1055~1200 ℃、应变速率0.01~0.1 s-1

Abstract: Hot compression deformation tests of cobalt base superalloy 5605 alloy by vacuum induction electroslag remelting were performed on Gleeble-3500 thermal simulator. The deformation behavior of as-cast GH5605 alloy was studied at the temperature ranging from 950-1200 ℃, strain rate ranging from 0.001 to 10 s-1 with true strain of 0.65. The results show that the true stress-strain curve of GH5605 alloy belongs to the working hardening type + dynamic recovery type. The true stress-strain curve of GH5605 alloy is mainly divided into three stages: Ⅰ severe work hardening stage; Ⅱ gentle work hardening stage; Ⅲ steady stage. The average relative error (δ) of the constitutive model is 11.99%, the correlation coefficients (Rr) is 0.95, the optimum hot working domain for GH5605 alloy is 1055-1200 ℃ and 0.01-0.1s-1.

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