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經 高溫退火, 故波來鉄有球粒化現象. 紅色為碳化物. Was annealed at 900C, therefore its pearlite are partially spheroidized. Carbide particles are tinted.
玻璃模(面)需有D type 石墨, 熱龜裂才不會太早發生.
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經 高溫退火, 故波來鉄有球粒化現象. 紅色為碳化物. Was annealed at 900C, therefore its pearlite are partially spheroidized. Carbide particles are tinted.
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