Sintering Characteristics of Rapidly Solidified Cast Iron Powder

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  • 急速凝固鋳鉄粉末の焼結特性
  • キュウソク ギョウコ チュウテツフンマツ ノ ショウケツ トクセイ

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Abstract

  The consolidation and sintering behavior and the microscopic structure during or after sintering were investigated for the samples A (Fe-4.29 % C) and B (Fe-3.88 % C-1.86 % Si) of cast iron powder which were atomized by the water. A summary of results is shown below. Sample B with silicon could not obtain a sufficient density compared to sample A because graphite precipitates at grain boundaries prior to sintering reaction. The similar effect was also recognized on the specimens which were sintered using a mixed powder of a metal powder of graphitization element and sample A. The structure after sintering on both the samples was fine pearlite, and the graphite was too fine to be observed by optical microscope. However hardness of the samples were very low (HRB = 20) compared to a practical cast iron. The decomposition rate of carbides in as-received powder is considerably high. Carbides were completely decomposed at 3.6 ks after heating even the sample A without silicon.

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