An investigation into the mechanisms of nucleation and growth of the graphite phase in eutectic iron-carbon, iron-carbon-silicon and related alloys.

Lakeland, K. D. (1965). An investigation into the mechanisms of nucleation and growth of the graphite phase in eutectic iron-carbon, iron-carbon-silicon and related alloys. PhD Thesis, School of Engineering, The University of Queensland.

       
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Author Lakeland, K. D.
Thesis Title An investigation into the mechanisms of nucleation and growth of the graphite phase in eutectic iron-carbon, iron-carbon-silicon and related alloys.
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 1965
Thesis type PhD Thesis
Supervisor Professor P.T.M. White
Total pages 2 v.
Language eng
Subjects 09 Engineering
Formatted abstract       A study of the metallographic structures of the eutectic systems which form the basis of cast iron, technology has been carried out, using mainly the technique of directional solidification, with the intention of determining the mechanisms of nucleation and growth of the eutectic. This technique has revealed new structures whose appearance has been shown to depend on the impurity levels in the alloys, particularly sulphur, and the solidification parameters, solidification rate (R) and thermal gradient (G). The usual structure of grey cast iron has been shown to be dependent on these variables, and a new cyclic mode of nucleation and growth has been postulated for the "irregular" structure found in commercial iron.

      It is also postulated that the austenite phase has an important influence on the nucleation of the eutectic. Repeated sectioning of directionally solidified samples has shown that the graphite phase in graphite eutectics is interconnected and, un.der ideal conditions, the inter-graphite spacing is governed by laws which have been shown to govern the inter-lamellar spacing of normal lamellar eutectics.

      It is considered that graphitic eutectics are essentially "normal" in behaviour, and the theory of the "Coupled Zone" can be used to explain their solidification, particularly with reference to the "irregular" structures which have previously been considered to be "anomalous".
Keyword Cast-iron -- Metallography.

 
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