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鑄造與合金參數對延性鑄鐵FCD800-2拉伸性質之影響

The Effect of Casting and Alloying Parameters on the Tensile Property of FCD800-2 Ductile Cast Iron

摘要


本研究主要是探討鑄造參數(球化劑添加量、接種劑添加量、球化處理溫度等)和合金參數(合金元素之種類、添加量)對於澆鑄所得延性鑄鐵FCD800-2鑄件之機械性質(抗拉強度、延性)與金相顯微組織(球化率、球墨數、基地組織)的影響。 實驗研究結果顯示,鑄造參數和合金參數對於延性鑄鐵FCD800-2鑄件的機械性質與金相組織都有明顯的影響。而其中鑄造參數方面以較多的球化劑添加量(1.2%)、較多的接種劑添加量(0.4%)及較高的球化處理溫度(1520℃),可以得到抗拉強度較佳及球化率較高的鑄件。而合金參數方面在分別添加Cu及Cr時,添加較多量的Cu及Cr均可得到高抗拉強度的延性鑄鐵FCD800-2鑄件。 因為較高的球化劑添加量可以提高鑄件的球化率,接種劑可以使球墨的分布均勻,而較高的球化溫度則可提高球化劑及接種劑的烙入率。添加Cu及Cr則是可以改變鑄鐵的基地組織,故可改變鑄件的機械性質及金相組織。

並列摘要


The purposes of this research are to study the effects of casting parameter (addition amount of nodulant, addition amount of inoculant, spheroidizing treatment temperature etc.,) and alloying parameter (the kind and addition amount of alloying elements) on the tensile properties (tensile strength, ductility) and metallographic microstructures (nodularity, nodule count, matrix etc.,) of FCD800-2 ductile cast iron. The experimental results indicate that casting and alloying parameters have significant effects on tensile properties and metallographic microstructure of FCD800-2. In casting parameters, increasing the addition amount of nodulant and inoculant and pouring temperature all can elevate tensile strength and nodularity of FCD800-2. In alloying parameters, higher tensile strength of FCD800-2 is obtained with the higher addition amount of Cu or Cr. The elevation addition amount of nodulant and inoculant can raise casting nodularity and distribute nodular graphite well, respectively. Higher pouring temperature may improve the recovery of nodulant and inoculant. The addition of Cu and Cr might chance the matrix of cast iron then resulting in alterations on tensile properties and matallographic microstructure of castings.

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