Application of Koistinen and Marburger’s athermal equation for volume fraction of martensite to diffusional transformations obtained on continuous cooling 0·13%C high strength low alloy steel

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Abstract
Koistinen and Marburger?s (KM) equation for the variation of volume fraction of athermal martensite y with temperature Tbelow the Ms has been applied to continuous cooling diffusional data. The data consisted of dilatometer curves obtained on continuous cooling of a 0?13%C high strength low alloy steel. The KM equation takes the form, ln(1 - y) = ?(Ms - T ). Plots of -ln (1 - y) against temperature for what are thought to be grain boundary ferrite, intragranular ferrite, proeutectoid ferrite, and pearlite give a series of straight lines of increasing slope ?. Intersections of these lines give the temperature of transformation points in good agreement with those on the dilatometry curves. Values of ? obtained for each transformation are compared with those previously obtained for martensite in plain carbon and alloy steels and ferrite in Fe?9%Ni.Koistinen and Marburger?s (KM) equation for the variation of volume fraction of athermal martensite y with temperature Tbelow the Ms has been applied to continuous cooling diffusional data. The data consisted of dilatometer curves obtained on continuous cooling of a 0?13%C high strength low alloy steel. The KM equation takes the form, ln(1 - y) = ?(Ms - T ). Plots of -ln (1 - y) against temperature for what are thought to be grain boundary ferrite, intragranular ferrite, proeutectoid ferrite, and pearlite give a series of straight lines of increasing slope ?. Intersections of these lines give the temperature of transformation points in good agreement with those on the dilatometry curves. Values of ? obtained for each transformation are compared with those previously obtained for martensite in plain carbon and alloy steels and ferrite in Fe?9%Ni.Peer reviewe
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