锅炉高温受热面蒸汽氧化皮微观结构和剥落敏感性研究

Study on Steam Oxide Microstructure Morphology and Exfoliation Sensitivity of High-Temperature Heating Surface of Boilers

氧化皮的微观结构包含了平面晶粒形貌和剖面分层结构等多维信息。氧化皮剥落敏感性与微观结构有着密不可分的联系。通过对多种材料、运行工况(运行时间、温度和方式)和化学工况下氧化皮微区结构进行对比分析,氧化皮的平面晶粒形貌特征可以提炼出晶粒类型和大小、柱状和切面特性等特征描述晶粒的镶嵌性能,剖面分层结构特征可以通过厚度、分层程度、空洞含量等加以表征。两个维度信息的结合,可以综合判断氧化皮状态、生长阶段和剥落敏感性,为预测、预防氧化皮危害提供决策依据。

The microstructure of the oxide scale contains a wealth of information about plane grain morphology and section structure. Research suggests that the extoliation sensitivity is closely related to the microstructure of the oxide scale. Through the comparison between the oxide scale microstructures of various materials under different operating conditions （i. e. operation duration, temperature and mode） and chemical conditions, the embeddedness property of grain can be extracted fi＇om the grain type and size, column shall and lancet of the planar grain morphology. The profile layer structure characteristics can be characterized by its thickness, delamination and void content. the combination of the two dimensional information can be integrated together to comprehensively determine the growth stage and exfoliation sensitivity, so as to provide decision-making basis for predicting and preventing the damage of the oxide.