穿缸螺栓断裂分析  

FRACTURE ANALYSIS ON FASTENING BOLTS IN SEGMENTAL PUMP

作　　者：曾振鹏[1] 曹力军[1] 张惠娟[1] 戴嘉维[1] 糜恺 

机构地区：[1]上海交通大学高温材料及高温测试教育部重点实验室,上海200030 [2]上海电力修造厂有限公司,上海200011

出　　处：《理化检验（物理分册）》2003年第10期532-534,共3页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：一根用来紧固节段式水泵的穿缸螺栓仅服役3个月便产生断裂。采用断口分析、金相检验和硬度测定等方法,对断裂螺栓进行了分析。分析结果表明,断口宏观上有明显的贝纹线花样,微观形态主要为疲劳辉纹,因此螺栓的断裂是疲劳断裂。材料棒中存在严重的中心碳偏析致使材料强度不均匀,造成材料强度偏低。碳偏析及材料强度不足是引起断裂的主要原因。The fracture reasons of fastening bolts are analyzed using fractography, metallographic analysis and hardness testing in this paper. It is shown that the fracture surface characterized with cowrie pattern lines and the microstructure being fatigue striation, which indicated the fracture of the bolt is brittle. Metallographic analysis shows that the central carbon segregation was existed heavily in the raw material. It is also found that the strength of the material is lower than standard. Therefore, such fatigue fracture mainly due to the existing of central carbon segregation.

关 键 词：穿缸螺栓 疲劳断裂 碳偏析 失效分析 断口分析 金相检验 硬度测定 紧固节段式水泵 

分 类 号：TH3[机械工程—机械制造及自动化] TG142.41[一般工业技术—材料科学与工程]