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這是台製2311的合金鋼. 上圖的裂源磨平後, 可看到許多微縮孔與裂痕. 鍛造製程待加強. 有這些內部缺陷, 模具很難不破裂. 材料有這些內部缺陷, 後面所有製程都是做白工. 2311 alloy steel made by a Taiwan special steel mill. Defect of interdendritic shrinkage pores is the cause of the fracture---crack initiated from defect of the material (aqua arrow). 水藍色箭頭所指為裂源.
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