Crystal viscoplasticity model for creep failure mechanism analysis and fracture life prediction in Ni-based single crystal superalloy

IF 5.3 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics Pub Date : 2025-08-02 DOI:10.1016/j.engfracmech.2025.111469

Chengjiang Zhang , Guangxian Lu , Chuan Liu , Zhixun Wen , Fangmiao Duan , Weiming Li , Tao Hu , Zhongming Ren

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引用次数: 0

Abstract

The performance of single crystal (SX) turbine blades during service is greatly affected by rafting, which increases the mean free path of dislocations, hence accelerating the rate of creep. The creep responses of the second-generation nickel-based SX superalloy were analyzed at a temperature of 980 ℃ and under various loads using Scanning Electron Microscopy (SEM), transmission electron microscope (TEM) and image processing software. The microstructure evolution parameter was utilized to quantitatively determine the rafting condition by quantifying the width of the matrix phase during creep, and subsequently incorporated into the constitutive model. The creep fracture life prediction model is established based on the Norton equation derived from crystal viscoplasticity theory, which characterizes anisotropy and incorporates the definition of equivalent damage to reflect the evolution of microstructure. The model provides a quantitative creep fracture analysis of service conditions by quantifying the microstructure evolution.

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镍基单晶高温合金蠕变失效机理分析及断裂寿命预测的晶体粘塑性模型

单晶（SX）涡轮叶片在使用过程中的性能受到漂流的影响很大，漂流增加了位错的平均自由程，从而加速了蠕变速率。采用扫描电镜（SEM）、透射电镜（TEM）和图像处理软件分析了第二代镍基SX高温合金在980℃和不同载荷下的蠕变响应。显微组织演化参数通过量化蠕变过程中基体相的宽度来定量确定流变条件，并将其纳入本构模型。基于晶体粘塑性理论推导出的Norton方程，建立了表征各向异性的蠕变断裂寿命预测模型，并引入了等效损伤的定义来反映微观组织的演变。该模型通过量化微观组织演变，提供了使用条件下蠕变断裂的定量分析。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Engineering Fracture Mechanics 物理-力学

CiteScore

8.70

自引率

13.00%

发文量

606

审稿时长

74 days

期刊介绍： EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.