气闸门顶轴断裂原因  

Fracture reason of gas apical axis

作　　者：程健 方可伟[1,2] 罗坤杰 张度宝[1] 费克勋 CHENG Jian;FANG Kewei;LUO Kunjie;ZHANG Dubao;FEI Kexun(Suzhou Nuclear Power Research Institute Co.,Ltd.,Suzhou 215004,China;National Engineering Research Center for Nuclear Power Plant Safety&Reliability,Suzhou 215004,China)

机构地区：[1]苏州热工研究院有限公司,苏州215004 [2]国家核电厂安全及可靠性工程技术研究中心,苏州215004

出　　处：《理化检验（物理分册）》2023年第12期44-46,50,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：某核电厂气闸门顶轴发生断裂,采用宏观观察、化学成分分析、硬度测试、金相检验和断口分析等方法分析其断裂原因,结果表明:材料中存在缺陷和网状铁素体,先共析铁素体使材料的强度与冲击韧性降低,在受到切向应力的工况下,材料发生脆性断裂。The gas apical axis of a nuclear power plant fractured.The fracture reasons were analyzed by means of macroscopic observation,chemical composition analysis,hardness test,metallographic examination and fracture surface analysis.The results show that there were defects and reticular ferrite in the material.The strength and impact toughness of the material were reduced by the proeutectoid ferrite,and the brittle fracture of the material occurred under the condition of tangential stress.

关 键 词：顶轴 网状铁素体 脆性断裂 缺陷 

分 类 号：TB31[一般工业技术—材料科学与工程] TG115.2[金属学及工艺—物理冶金]