考虑微观组织演变的镍基单晶合金蠕变行为研究

IF 1.7 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Multidiscipline Modeling in Materials and Structures Pub Date : 2023-09-08 DOI:10.1108/mmms-12-2022-0271
Xing Ai, Shuaishuai Wang, Fenghua Luo, H. Pei, Zhenwei Li
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引用次数: 0

摘要

目的本研究旨在描述单晶高温蠕变变形的机理,更准确地预测蠕变寿命,并研究具有微观结构演化的蠕变本构模型和寿命模型。设计/方法/途径镍基单晶高温合金的力学性能与γ′相密切相关。在四种不同的温度和应力条件下进行了蠕变试验。用数值方法拟合了蠕变温度、应力和寿命之间的关系,得到了蠕变激活能。用扫描电子显微镜观察了不同蠕变阶段的蠕变断口、强化相(γ′)和基体相(γ)的形态和演化。随着蠕变温度的升高,漂流时间提前。用透射电子显微镜(TEM)观察了位错的详细形貌和演化过程。发现随着蠕变温度的升高,位错的漂移时间提前。用透射电镜观察了位错的详细形貌和演化过程。位错主要集中在γ通道相中,尤其是在高温和低应力下。独创性/价值基于γ′相尺寸和γ通道宽度的演化,提出了蠕变本构模型。与实验结果相比,预测的蠕变寿命在1.4倍误差色散带内。
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Study on creep behaviors of nickel-based single-crystal alloys considering microstructure evolution
Purpose The purpose of this study is to describe the mechanism of single-crystal high-temperature creep deformation, predict the creep life more accurately and study the creep constitutive and lifetime models with microstructure evolution.Design/methodology/approachThe mechanical properties of nickel-based single-crystal superalloy are closely related to the γ' phase. Creep tests under four different temperature and stress conditions were carried out. The relationship between creep temperature, stress and life is fitted by numerical method, and the creep activation energy is obtained. The creep fracture surface, morphology and evolution of strengthening phase (γ') and matrix phase (γ) during different creep periods were observed by scanning electron microscope. With the increase of creep temperature, the rafting time is advanced. The detailed morphology and evolution of dislocations were observed by transmission electron microscope (TEM).FindingsWith the increase of creep temperature, the rafting time is advanced. The detailed morphology and evolution of dislocations were observed by TEM. Dislocations are mainly concentrated in the γ channel phase, especially at high temperature and low stress.Originality/valueA creep constitutive model based on the evolution of γ' phase size and γ channel width was proposed. Compared with the experimental results, the predicted creep life is within 1.4 times error dispersion band.
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来源期刊
CiteScore
3.70
自引率
5.00%
发文量
60
期刊介绍: Multidiscipline Modeling in Materials and Structures is published by Emerald Group Publishing Limited from 2010
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