摘要
某厂生产的40Cr钢轮毂螺栓在车削过程中出现小批量断裂事故。采用断口分析、化学成分分析、金相检验及硬度测试等方法,对轮毂螺栓的断裂原因进行了分析。结果表明:轮毂螺栓在加热炉中发生局部过烧,使得该部位的晶间结合力降低,导致螺栓在车削过程中发生脆性断裂。
A small number of fracture accidents occurred in the turning process of 40Cr steel hub bolts produced by a factory.The fracture causes of the hub bolts were analyzed by means of fracture analysis,chemical composition analysis,metallographic examination and hardness test.The results show that the hub bolts were burned locally in the heating furnace,which reduced the intergranular adhesion of this part,and caused brittle fracture of the bolts in the turning process.
作者
范德国
FAN Deguo(Weifang Special Steel Group Co.,Ltd.,Weifang 261201,China)
出处
《理化检验（物理分册）》
CAS
2020年第10期51-53,57,共4页
Physical Testing and Chemical Analysis(Part A:Physical Testing)
关键词
轮毂螺栓
过烧
断裂
晶间结合力
车削
hub bolt
over burnt
fracture
intergranular adhesion
turning
