摘要
针对某火力发电机组进口鼓风机主轴断裂问题,采用宏观断口分析、化学成分分析、金相分析、能谱分析、力学性能和显微硬度检测等手段对其断裂原因进行了分析。结果表明:轴断裂的主要原因是由于异常的二次淬火导致轴颈基体表面形成硬而脆的粗大淬火马氏体和软化的块状铁素体等不良组织,降低了轴颈处的抗疲劳性能,运行过程中在高周交变应力作用下发生疲劳断裂。
In order to find out the fracture reason of the imported blower shaft in a thermal power generating unit, methods of macro-observation, chemical composition analysis, metallographic examination, spectrum analysis, mechanical properties test and microhardness test were used to analyze the failure shaft. The results show that the main reason for the high cycle fatigue fracture of the shaft is due to abnormal secondary quenching, which results in the generation of harmful microstructure such as hardy and brittle quenched martensite and massive soft ferrite along the shaft neck.
出处
《金属热处理》
CAS
CSCD
北大核心
2016年第9期179-181,共3页
Heat Treatment of Metals
关键词
鼓风机轴
疲劳断裂
淬火马氏体
blower shaft
fatigue fracture
quenched martensite
