换热器螺栓断裂分析

Analysis of Fractured Bolt of Plate Thermal Exchanger

采用宏观观察,化学成分分析,扫描电镜断口观察和能谱分析,显微组织检验等方法对断裂的钣式换热器螺栓进行分析。结果表明:钣式换热器螺栓断裂的原因由于原材料的中心区域存在较密集的条带状成分偏析和非金属夹杂物,并在成分偏析和夹杂物条带上存在横向微裂纹,导致在组装拧紧力的作用下,微裂纹迅速扩展致断。

The Macroscopic analysis,chemical composition analysis,SEM,EDAX observation and metallographic examination are conducted to study the fractured bolt of the plate thermal exchanger supplied by a certain factory.High density banded segregations and nonmetal impurities are observed around the central area of the material and many micro cracks exist along the segregations and impurities bands.The micro cracks promote growth to breaking when the bolt is under loading.