锅炉技术2026，Vol.57Issue(4)：46-51,6.
超超临界机组S30432受热面失效机理研究
Research on the Failure Mechanism of S30432 Heating Surface in Ultra Supercritical Unit
摘要
Abstract
The failure mechanism of S30432 heating surface was studied by conducting microstructure analysis,scanning electron microscopy and energy spectrum analysis,transmission electron microscopy analysis,room temperature tensile test,room temperature impact test,and high temperature tensile test on S30432 cracked tubes after different service cycles.The results show that failure mode of S30432 overheated tubes all conform to the characteristics of creep cracking,and the precipitation of large block M23C6 phase or σ phase at the grain boundary promotes the formation of creep cracks.Under different service cycles,the types of crystal boundary precipitates in the explosive tubes are different,short cycle overheating mainly precipitates M23 C6 phase,while some M23 C6 phase transforms into harmful σ phase with the extension of service cycle.In the supervision of S30432 heating surface,the focus should be on checking the deterioration of properties such as plasticity,toughness,and high-temperature strength,to reduce the risk of early failure caused by this.关键词
S30432/过热/失效机理/晶界析出相/蠕变失效Key words
S30432/overheating/failure mechanism/grain boundary precipitation phase/creep failure分类
能源科技引用本文复制引用
杨希锐,李世涛,李艳军,邓雷凯,张宁,高立行,马东方,胡锋涛..超超临界机组S30432受热面失效机理研究[J].锅炉技术,2026,57(4):46-51,6.基金项目
华润电力控股有限公司重大科技研发项目(CRP-R&D-LX-2024-004) （CRP-R&D-LX-2024-004）
