The electromagnet coil former was analyzed by means of metallurgical microscope.The results shows that cracks results from excessive high temperature while casting and material embrittlement.

• 用金相显微镜对衔铁线圈骨架的裂纹进行分析。结果表明,由于锻造加热温度偏高,材料脆化导致裂纹形成。