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淬火目的就是要獲得Martensite, 出現非Martensite組織(F,P,B 統稱非M)後, 硬度/強度就急遽下降.

end quench  

S45C 0  S45C 1  S45C 2  S45C a  

above: 100%Martensite;  below: M (matrix) + Bainite (red arrows)

S45C b  S45C c  

Below: yellow arrows: fine Pearlite; red arrow: Bainite. White lines: Ferrite.

S45C d  

 

Below: Both yellow and red arrows are Pearlite. Color difference is caused by different grain orientations.

S45C e  S45C f  

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