leometwu的部落格

Aged.  Carbide  phases (both primary and secondary) tinted purple, blue, green. Matrix of Austenite(沃斯田鉄) white to yellow.

   500x
  200x

1. Be sure to test the iron melt before inoculation treatment. If you sample the inoculated iron melt of  high CE value, you probably will not get a flat curve on the TE area.  TE is used to calculate Si% and Si% is only correct if TE curve is flat.  FC is calculated from CE, which, in turns, is calculated from TL, the first thermal arrest on the cooling curve. FC (CE) is always correct even if you get a wrong TE curve, that is to say that FC is dependent on TL only and is independent of TE.

高溫退火過. 所以波來鉄有球粒化現象. Had been annealed at high temp, therefore you see spheroidization of  Pearlite. Large carbide are tinted pink, mostly. Ti was added to promote D-type graphite. You can see many cubic particles of TiN.

Matrix is fully pearlitic. Steadite tinted pink.

鵝黃色部位為史帝田鉄. 此組織之尖角不利於玻璃模熱疲勞壽命. 降低磷含量就可減少 史帝田鉄 的數量.  高溫退火多少也可將尖銳角變圓鈍一點. Metallographic micrographes for a glass mold.
Ti is usually added to promote formation of finely dispersed D-type graphite flakes distribution which provide the glass mold with a longer thermal fatigue life. 

素材就有網狀碳化物者, 淬後常會有些許遺傳下來. 造成韌性的劣化.  模具短命, 理所當然.

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.

D-型石墨