Growth temperatures and the limits of coupled growth in unidirectional solidification of Fe-C eutectic alloys View Full Text


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Article Info

DATE

1980-08

AUTHORS

H. Jones, W. Kurz

ABSTRACT

Growth temperature has been measured as a function of applied growth velocityV for grey (austenite-flake graphite) eutectic, austenite dendrites and white (austenite-cementite) eutectic in Fe-4.28 wt pct C at a temperature gradientG of ∼7 K/mm. Grey eutectic (0.4 to 65 µm/s) required an undercoolingΔTfor growth equal toK1V1/2 withK1 as 3.4 ± 0.1 Ks1/2/µm1/2, giving values ofΔT nearly an order of magnitude larger than predicted for growth at the extremum, as shown previously by Toloui and Hellawell for the related Al-Si eutectic. Austenite dendrites growing together with the grey eutectic atV between 11 and 65 µ m/s exhibited a range of tip temperatures giving rise to average undercoolings of magnitude [GD/V +K2Vn] withD as diffusion coefficient of carbon in the melt andK2 as 0.73 Ksn µm−n withn as 0.46 predicted by Ivantsov’s theory for growth of an austenite needle. White eutectic displaced both grey eutectic and austenite dendrites atV of 100 µm/s. Except for the persistence of grey eutectic rather than white eutectic in the presence of austenite dendrites (11 More... »

PAGES

1265-1273

References to SciGraph publications

  • 1974-09. Complex alloy powders produced by different atomization techniques: relationship between heat flow and structure in JOURNAL OF MATERIALS SCIENCE
  • 1972-01. Thermodynamics and phase diagram of the Fe-C system in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1973-04. The composition of interdendritic eutectic in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1976-06. Dendrite morphology of steady state unidirectionally solidified steel in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1975-08. The coupled zone in grey cast iron in METALLURGICAL AND MATERIALS TRANSACTIONS A
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    http://scigraph.springernature.com/pub.10.1007/bf02653480

    DOI

    http://dx.doi.org/10.1007/bf02653480

    DIMENSIONS

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