Thermodynamic behaviour of nitrogen in the carbon saturated Fe-Mn-Si alloy during casting

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Abstract

The evolution of nitrogen gas formation in cast iron was studied based on the information of the N solubility in the carbon-saturated iron-containing Mn and Si over the wide temperature range. In order to verify the accuracy of the Fe-Mn-Si-C phase diagram, the transition temperatures of the Fe-Mn-2.7 wt%Si-Csat alloys were measured according to the Mn concentration using a differential scanning calorimetry under the purified Ar atmosphere. The recent thermodynamic modelling result of the Fe-Mn-Si-C-N system was used to describe the solubility limit of N in liquid and solid solution in the carbon saturated iron alloys. The cooling and quenching experiments were also carried out to check the effects of temperature and phase transformation on the N solubility limit in the temperature range from 500°C to 900°C.
Original languageEnglish
Pages (from-to)226-232
Number of pages7
JournalInternational Journal of Cast Metals Research
Volume33
Issue number4-5
DOIs
Publication statusE-pub ahead of print - 15 Oct 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • nitrogen
  • defect
  • blowholes
  • grey cast iron
  • transition temperature
  • Fe-Mn-Si-C-N system

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