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利用光学金相、扫描电镜、电子探针等手段对制氢转化炉Incoloy800H管材服役后的组织损伤特征进行分析,并借助弹塑性有限元法分析了管材服役过程温差应力与管材开裂的关联性。结果表明,Incoloy800H管材在服役过程中发生了晶界氧化、晶间腐蚀及元素偏聚现象,管材内壁附近出现3个区域(氧化区,贫碳化物区,碳化物区),其中贫碳化物区深度可达100μm;服役过程贫碳化物区晶界抗蠕变能力的下降及服役过程中管材内壁周向温差应力的综合影响导致Incoloy800H管材服役过程裂纹的萌生及扩展。
The characteristics of tissue injury of Incoloy800H pipe after service were analyzed by means of optical metallography, scanning electron microscope and electron probe. The relationship between temperature stress and pipe cracking during service of pipe was analyzed by elastoplastic finite element method. The results show that Incoloy800H pipe has grain boundary oxidation, intergranular corrosion and element segregation during service. There are three regions (oxidation zone, lean carbide zone and carbide zone) near the inner wall of the pipe. Incoloy800H Depth of up to 100μm. The combined effect of the decrease of creep resistance in the grain boundary of lean carbide during service and the combined effect of circumferential temperature stress on the inner wall of the pipe during service led to the initiation and propagation of cracks in Incoloy800H pipe during service.