A mathematical model has been developed for studying the diVusion kinetics of carbon during the austenitisation of a ferritic ductile iron. In modelling the diVusion process, the finite diVerence method was used and the diVusion equation was solved using the Crank-Nicolson (implicit) form. T he results obtained were compared with those from the conventional error function estimates. For short diVusion distances, that is, spheroidal graphite irons with a high nodule count, the diVusion times required to attain carbon equilibrium suggested by the finite diVerence and error function methods were similar. For medium to low nodule counts, the times predicted by the error function estimate were less than those suggested by the finite diVerence analysis.MST /4134
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