摘要
对汽车某断裂法兰螺栓进行外观检查、断口分析、化学成分分析、金相组织检查及硬度检测等试验,在理化试验的基础上,运用微观断裂理论对螺栓的断裂原因进行综合分析得出结论:淬火时碳势控制不良造成螺栓表面增碳严重,而电镀工艺氢原子的渗入导致装配后的螺栓氢脆断裂。
Appearance inspection, fracture analysis, chemical composition analysis, microstructure examination and hardness testing experiment were completed to a ear fractured flange bolt. On the basis of physical and chemical testing, micro-fracture theory was used to comprehensively analyze fi＇acture reasons of the bolt. It is concluded that poor carbon potential control when the bolt is quenched causes serious reearburation on the surface of the bolt, and plating process hydrogen atoms penetrating leads to the final hydrogen embrittlement fracture.
出处
《汽车零部件》
2016年第1期38-42,共5页
Automobile Parts
关键词
螺栓
疲劳断裂
电镀
氢脆
Bolt
Fatigue fracture
Plating
Hydrogen embrittlement
