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AISI 4140感應加熱. 故意高溫淬火, 故晶粒非常粗大. Intentionally over-heated with induction heating to obtain coarse grains.
下:近外表處. 表層稍熔解後又凝固(re-cast layer).
re-cast layer looks like hypo-eutectic white cast iron, the martensite plates beneath it look somewhat lenticular------ carbon absorption of the melted outer layer during oil-quenching ? It seems so to me.
感應加熱 故意高溫淬火
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