Temperature measurement during solidification of thin wall ductile cast iron. Part 1: Theory and experiment

Karl Martin Pedersen, Niels Skat Tiedje

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    Abstract

    Temperature measurement using thermocouples (TC’s) influence solidification of the casting, especially in thin wall castings. The problems regarding acquisition of detailed cooling curves from thin walled castings is discussed. Experiments were conducted where custom made TC’s were used to acquire cooing curves in thin wall ductile iron castings. The experiments show how TC’s of different design interact with the melt and how TC design and surface quality affect the results of the data acquisition. It is discussed which precautions should be taken to ensure reliable acquisition of cooling curves. Measurement error depending on TC design and cooling conditions is shown. A method is presented that allows acquisition of cooling curves in thin walled ductile iron castings down to thickness of at least 2.8 mm. The obtained cooling curves can be used to compare nucleation and growth during solidification of castings with different plate thicknesses.
    Original languageEnglish
    JournalMeasurement: Journal of the International Measurement Confederation
    Volume41
    Issue number5
    Pages (from-to)551
    ISSN0263-2241
    DOIs
    Publication statusPublished - 2008

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