论文标题
高温服务对离心机铸造HP40改革器管的复杂壁壁微观结构的影响
Effect of high temperature service on the complex through-wall microstructure of centrifugally cast HP40 reformer tube
论文作者
论文摘要
离心铸造的改革管用于石化植物中，用于氢生产。由于氢产生的条件，改革仪管暴露于高温，这会在微观结构内造成蠕变损伤。在这项研究中，通过从MM到UM的一系列长度尺度进行的微观结构表征比较了来自同一蒸汽改革仪单元的两种不同的HP40合金改革仪。通过EBSD（电子反向散射衍射），EDS（能量分散X射线光谱）和PCA（主成分分析）进行的分析表明，两个试管具有相似的显微结构成分，并且在晶粒范围内存在奥氏体基质和M23C6，G相，G相，G相和M6C碳纤维。即使两个试管都具有类似的微结构，一个试管在蒸汽改革仪内部内部的定位引起的一个管子呈现出一个微小裂纹的区域，这可能表明该管子比另一个裂口累积了蠕变损伤。
Centrifugally cast reformer tubes are used in petrochemical plants for hydrogen production. Due to the conditions of hydrogen production, reformer tubes are exposed to high temperature which causes creep damage inside the microstructure. In this study, two different ex-service HP40 alloy reformer tubes which come from the same steam reformer unit have been compared by microstructural characterisation performed at a range of length scales from mm to um. Analyses performed by EBSD (Electron Backscatter Diffraction), EDS (Energy Dispersive X-ray Spectroscopy) and PCA (Principal Component Analysis) show that both tubes have similar microstructural constituents, with the presence of an austenitic matrix and M23C6, G phase and M6C carbides at the grain boundaries. Even if both tubes have a similar microstructure, one tube due to it localisation inside the steam reformer unit presents a region with more micro cracks which may indicate that this tube have accumulated more creep damage than the other one.
