Fatigue Assessment of Inclined Film Cooling Holes in Nickel-Based Single-Crystal Superalloy

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS

ACS Applied Bio Materials Pub Date : 2024-07-14 DOI:10.2514/1.j064178

Huanbo Weng, Cheng Luo, H. Yuan, Yuanxing Gu

引用次数: 0

Abstract

Fatigue tests of nickel-based single-crystal superalloys with inclined film cooling holes (FCHs) at 1000°C were conducted to investigate the effects of crystal orientation and to quantify the fatigue performance of the high-temperature structures. Fractographic analysis and computations of stress concentrations revealed competitive failure mechanisms between mode I crack nucleation and fatigue crack growth in crystallographic plastic slip systems, whereas crack nucleation around inclined FCHs can be characterized by the known fatigue criteria derived for smooth specimens. A life prediction model based on the crystal slip mechanism and the theory of critical distance was introduced to predict the fatigue life of FCH structures and provided reasonable accuracy for different FCH specimens.

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镍基单晶超级合金斜膜冷却孔的疲劳评估

为了研究晶体取向的影响并量化高温结构的疲劳性能，我们在 1000°C 下对带有倾斜薄膜冷却孔 (FCH) 的镍基单晶超合金进行了疲劳试验。应力集中的断面分析和计算揭示了晶体塑性滑移系统中模式 I 裂纹成核和疲劳裂纹增长之间的竞争性失效机制，而倾斜 FCH 周围的裂纹成核可通过针对光滑试样得出的已知疲劳标准来表征。基于晶体滑移机制和临界距离理论的寿命预测模型被引入到 FCH 结构的疲劳寿命预测中，并为不同的 FCH 试样提供了合理的精度。

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

ACS Applied Bio Materials Chemistry-Chemistry (all)

CiteScore

9.40

自引率

2.10%

发文量

464

期刊介绍： ACS Applied Bio Materials is an interdisciplinary journal publishing original research covering all aspects of biomaterials and biointerfaces including and beyond the traditional biosensing, biomedical and therapeutic applications. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important bio applications. The journal is specifically interested in work that addresses the relationship between structure and function and assesses the stability and degradation of materials under relevant environmental and biological conditions.