Thermal Analysis of Ductile Iron Samples for Graphite Shape Prediction

  • Monroe R
  • Bates C
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Abstract

Many publications have indicated that the shape of a cooling curve obtained by placing a thermocouple in a solidifying sample of iron is related to the phases formed during solidification. The phases of in terest in clude aus ten ite, graphite and carbides. The shape of the graphite is of particular interest. · This program was undertaken explore the statistical reliability of predicting the gr�phite structure in nodular iron based on cooling curves. Approximately 400 samples of iron were collected from laboratory and production heats to assess the reliability of the predictions. In general, solidification of magnesium-treated irons at eutectic temperatures of about 1150C indicated inadequate magnesium treatment. Eutectic solidification at about 1132C usually reflected nodular graphite growth. Still lower solidification temperatures indicate massive carbide nu­ cleation and growth. The statistical ability to predict the graphite structure from the etuctic maximum temperature was about 80%, assuming a normal distribution

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  • SCOPUS: 2-s2.0-0020282338
  • ISSN: 00658375
  • SGR: 0020282338
  • PUI: 13568748

Authors

  • R. Monroe

  • C.E. Bates

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