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[机理] Offsetting Shrinkage in Ductile Iron What Thermal Analysis Shows

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    本帖最后由 Xavier2005 于 2020-5-15 21:17 编辑

    以前从谷歌上下载的好文章
    Offsetting Shrinkage in Ductile Iron
    What Thermal Analysis Shows
    By David Sparkman

    May 30, 2001
    Last Revision February 11th 2006

    Abstract
    The natural shrinkage that occurs during the solidification of Ductile Iron can be
    offset by the expansion caused by the formation of graphite. Though this has
    been known for some time, thermal analysis has some interesting contributions
    to understanding exactly what is going on, and offers some opportunities for
    better control of late graphite expansion in moderate section sizes. Different
    modes of solidification are examined and measured, and the early and late
    graphite content are calculated using thermal analysis. Carbon flotation is seen
    as a fourth form of solidification that is both hypereutectic and hypoeutectic.
    Shrinkage is seen as a lack of late graphite growth needed to offset the natural
    contraction of the Ferrite. Grain boundary shrinkage can be seen as an escape
    mechanism for minor unfulfilled contraction. Stress relief heat treat increases the
    graphite volume thereby collapsing any remaining of the grain boundary
    shrinkage and improving fatigue life and other physical properties.

    Offsetting Shrinkage in Ductile Iron What Thermal Analysis Shows.pdf

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