电液自由锻锤锤头开裂失效分析

The Fracture Failure Analysis on the Electro-hydraulic Free Forging Hammer

应用金相显微镜、扫描电镜、拉力试验机、冲击试验机、硬度计、光谱测试仪等通过宏观检查、尺寸检查、断口形貌分析、化学成分分析、机械性能试验、非金属夹杂物评级、金相组织分析等方法对某电液自由锻锤锤头开裂现象进行分析。分析结果表明锤头发生开裂的裂纹起始于燕尾槽槽底的R角处,开裂初始部位断口形貌显示有应力集中现象存在,锤头的开裂主要呈脆性断裂特征,裂纹扩展存在休止迹象。

Appling metallographic microscopy , scanning electron microscopy （ SEM ） , tensile testing machine , impact testing machine , hardness tester and spectrometer , it analyzes the reasons of fracture of electro-hydraulic free forging hammer in dimension , fracture morphology , chemical composition , mechanical property , nonmetallic inclusions , and microstructure .The results show that hammer cracks starting at the R corner of bottom of the dovetail slot , and the initial parts of the fracture surface cracking in the presence of stress concentration .The hammer cracks characteristic illustrates the brittle fracture , and there are signs of rest in cracks .