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表面過熱的異常組織: Austenite 吸入了過量的C/合金, 產生微熔現象(Incipient melting), 微熔區下方則為頑強の殘A區. 稱其頑強, 因為經回火540CX2HrX3次, 仍殘留很多.

M2 high speed steel

M2 high speed steel

M2 high speed steel

M2 high speed steel

黑色針狀物為高碳麻田散鉄, 其黃色背景則為碳/合金%過飽和的沃斯田鐵. 

M2 high speed steel

M2 high speed steel

M2 high speed steel

M2 high speed steel

M2 high speed steel

M2 high speed steel

M2 high speed steel

M2 high speed steel

M2 high speed steel

M2 high speed steel

M2 high speed steel

M2 high speed steel

M2 high speed steel

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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    金相 carbide Martensite Retained Austenite Martensite; Austenite
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