Damage mechanism on superalloy surface of coated gas turbine vanes after long-term service

IF 4.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis Pub Date : 2025-06-11 DOI:10.1016/j.engfailanal.2025.109797

Yang Chen , Zhihao Yao , Hongying Wang , Jianxin Dong , Jialin Peng , Mo Ren , Huanyu Yang , Liuxi Leng

引用次数: 0

Abstract

This study explored the damage mechanisms of coated gas turbine vanes after long-term service. The diffusion processes at the coating/substrate interface led to two significant microstructural degradation. The surface degradation mechanism under service conditions differed from that in isothermal exposure tests. This phenomenon was attributed to the diffusion of Al before the coating spallation, resulting in local high Al content on the alloy surface and the formation of AlN subsequently. Microstructural reconstruction and recrystallization at crack root led to the smaller effective load-bearing area, while coating damage accumulated at trailing edge, accelerating the local failure. It will provide theoretical support for long-term safe service of gas turbine.

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涂层燃气轮机叶片高温合金表面长期使用损伤机理

研究了涂层燃气轮机叶片在长期使用后的损伤机理。涂层/基体界面处的扩散过程导致了两个显著的微观结构降解。使用条件下的表面降解机制与等温暴露试验不同。这是由于涂层剥落前Al的扩散，导致合金表面局部高Al含量，随后形成AlN。裂纹根部的显微组织重构和再结晶导致有效承载面积变小，而涂层损伤在后缘累积，加速了局部破坏。为燃气轮机的长期安全运行提供理论支持。

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 Failure Analysis 工程技术-材料科学：表征与测试

CiteScore

7.70

自引率

20.00%

发文量

956

审稿时长

47 days

期刊介绍： Engineering Failure Analysis publishes research papers describing the analysis of engineering failures and related studies. Papers relating to the structure, properties and behaviour of engineering materials are encouraged, particularly those which also involve the detailed application of materials parameters to problems in engineering structures, components and design. In addition to the area of materials engineering, the interacting fields of mechanical, manufacturing, aeronautical, civil, chemical, corrosion and design engineering are considered relevant. Activity should be directed at analysing engineering failures and carrying out research to help reduce the incidences of failures and to extend the operating horizons of engineering materials. Emphasis is placed on the mechanical properties of materials and their behaviour when influenced by structure, process and environment. Metallic, polymeric, ceramic and natural materials are all included and the application of these materials to real engineering situations should be emphasised. The use of a case-study based approach is also encouraged. Engineering Failure Analysis provides essential reference material and critical feedback into the design process thereby contributing to the prevention of engineering failures in the future. All submissions will be subject to peer review from leading experts in the field.