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首页> 外文期刊>Journal of Materials Engineering and Performance >Failure Analysis and Magnetic Evaluation of Tertiary Superheater Tube Used in Gas-Fired Boiler
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Failure Analysis and Magnetic Evaluation of Tertiary Superheater Tube Used in Gas-Fired Boiler

机译：燃气锅炉中三级过热器管的故障分析与磁性评价

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摘要

Failure analysis was carried out on a prematurely failed tertiary superheater tube used in gas-fired boiler. The analysis includes a comparative study of visual examination, chemical composition, hardness and microstructure at failed region, adjacent and far to failure as well as on fresh tube. The chemistry was found matching to the standard specification, whereas the hardness was low in failed tube compared to the fish mouth opening region and the fresh tube. Microscopic examination of failed sample revealed the presence of spheroidal carbides of Cr and Mo predominantly along the grain boundaries. The primary cause of failure is found to be localized heating. Magnetic hysteresis loop (MHL) measurements were carried out to correlate the magnetic parameters with microstructure and mechanical properties to establish a possible non-destructive evaluation (NDE) for health monitoring of the tubes. The coercivity of the MHL showed a very good correlation with microstructure and mechanical properties deterioration enabling a possible NDE technique for the health monitoring of the tubes.
机译：在燃气锅炉中使用过早的叔过热器管上进行了失效分析。该分析包括在发生故障区域的视觉检查，化学成分，硬度和微观结构的比较研究，相邻的和远程发生故障以及新鲜管。与标准规范相匹配的化学成面匹配，而与鱼嘴开口区域和新鲜管相比，硬度在失效的管中较低。失败样品的显微镜检查显示了沿晶界主要存在Cr和Mo的球状碳化物。发现失败的主要原因是局部加热。进行磁滞回路（MHL）测量以将磁性参数与微观结构和机械性能相关联，以建立可能的非破坏性评价（NDE），用于管道的健康监测。 MHL的矫顽力显示出与微观结构和机械性能劣化的非常好的相关性，从而实现了用于管道的健康监测的可能NDE技术。

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