Failure Analysis of Second Row-Nozzles Based on FSX-414 Cobalt Alloy in a Gas Turbine Unit

IF 0.8 4区材料科学 Q3 METALLURGY & METALLURGICAL ENGINEERING Protection of Metals and Physical Chemistry of Surfaces Pub Date : 2023-12-29 DOI:10.1134/S2070205123701150

Ali Hadipour, Mohammad Ghasem Gholami, Masoud Araghchi, Mohsen Mehdizadeh

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Abstract

In this study, the failure analysis of the second row-nozzles of one of the gas turbine units was investigated. The vanes alloy was FSX-414 cobalt base alloy. The visual evaluations indicated that the leading-edge region of about 8 vanes was completely damaged, and needed to be replaced. The microstructural evaluation was studied by optical microscopy (OM) and scanning electron microscopy (SEM). The results showed that the primary carbides such as M₃C₂ and M₇C₃ were dissolved and the secondary carbides with M₂₃C₆ composition were formed continuously and coarsely on the grain boundaries. Also, the crack networks were created in the grain boundaries which were propagated throughout the sample thickness. The X-ray diffraction (XRD) and energy disperse spectroscopy (EDS) analyses indicated that hot oxidation and sulfidation have occurred on the leading-edge surface. It seems that the increasing temperature due to the asymmetry of the combustion line had caused such damage.

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燃气轮机组中基于 FSX-414 钴合金的第二排喷嘴的故障分析

摘要在这项研究中，对一台燃气轮机组第二排喷嘴的失效分析进行了调查。叶片合金为 FSX-414 钴基合金。目测结果表明，约有 8 个叶片的前缘区域完全损坏，需要更换。微观结构评估是通过光学显微镜（OM）和扫描电子显微镜（SEM）进行研究的。结果表明，M3C2 和 M7C3 等一级碳化物被溶解，在晶界上形成了连续而粗大的 M23C6 二级碳化物。此外，在晶界上还形成了裂纹网络，并在整个样品厚度上传播。X 射线衍射 (XRD) 和能量分散光谱 (EDS) 分析表明，前缘表面发生了热氧化和硫化。看来是燃烧线的不对称导致温度升高造成了这种破坏。

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来源期刊

Protection of Metals and Physical Chemistry of Surfaces 工程技术-冶金工程

CiteScore

1.90

自引率

18.20%

发文量

审稿时长

4-8 weeks

期刊介绍： Protection of Metals and Physical Chemistry of Surfaces is an international peer reviewed journal that publishes articles covering all aspects of the physical chemistry of materials and interfaces in various environments. The journal covers all related problems of modern physical chemistry and materials science, including: physicochemical processes at interfaces; adsorption phenomena; complexing from molecular and supramolecular structures at the interfaces to new substances, materials and coatings; nanoscale and nanostructured materials and coatings, composed and dispersed materials; physicochemical problems of corrosion, degradation and protection; investigation methods for surface and interface systems, processes, structures, materials and coatings. No principe restrictions exist related systems, types of processes, methods of control and study. The journal welcomes conceptual, theoretical, experimental, methodological, instrumental, environmental, and all other possible studies.