polaascent metallurgical microscope 偏振金相显微镜 high temperature metallurgical microscope 高温金相显微镜 inverted metallurgical microscope 试样倒放式金相显微镜 ..
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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。
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