original fission

After making fracture analysis, chemical analysis and metallographic examination to the broken ped estal, It is concluded that the main reason are the harden layer,original crack and shrinking hole remnant flaw existing on the raw material.

对断裂后的支撑座进行了断口、化学成分、金相组织分析,认为原材料存在淬硬层、原始裂纹及缩孔残余缺陷是导致断裂的主要原因。