长期服役后12%Cr高温螺栓断裂失效分析  

Analysis on Fracture Failure of 12%Cr High Temperature Bolt during Long-time Service

作　　者：李明超 张号 曾强 冯翌轩 张元 LI Mingchao;ZHANG Hao;ZENG Qiang;FENG Yixuan;ZHANG Yuan(College of Chemical Engineering,China University of Petroleum(East China),Qingdao 266580,China;Shandong Special Equipment Inspection Research Institute Co.,Ltd.,Ji'nan 250101,China;Shandong Branch of Huadian Electric Power Research Institute,Ji'nan 250014,China)

机构地区：[1]中国石油大学(华东)化学工程学院,山东青岛266580 [2]山东省特种设备检验研究院有限公司,山东济南250101 [3]华电电力研究院山东分院,山东济南250014

出　　处：《热加工工艺》2022年第20期162-166,共5页Hot Working Technology

基　　金：山东省质量技术监督局科研项目(2016KY15)。

摘　　要：采用宏观检验、化学成分分析、力学性能测试、显微组织分析、断口形貌及能谱分析等手段,对某电厂3号汽轮机高导法兰12%Cr螺栓断裂进行分析。结果表明,13^(#)断裂螺栓断裂机理以蠕变脆断为主导,腐蚀加速其开裂失效过程。根据高温螺栓断裂原因分析,提出加强对汽轮机各部位高温紧固螺栓金属监督的相关意见。The fracture of 12%Cr bolt of high-conductor flange of No.3 steam turbine in a power plant was analyzed by macroscopic inspection,chemical composition analysis,mechanical property test,microstructure analysis,fracture morphology and energy spectrum analysis.The results show that the fracture mechanism of 13^(#)fracture bolt is dominated by creep brittle fracture,and the corrosion accelerates the crack failure process.According to the analysis of the fracture causes of high temperature bolt,the relevant opinions on strengthening the supervision of high temperature fastening bolts in various parts of steam turbines are proposed.

关 键 词：12%Cr 高温螺栓 蠕变 应力腐蚀 断裂 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG111.91[金属学及工艺—金属材料]