Metallurgical Transactions A

, Volume 11, Issue 8, pp 1265–1273 | Cite as

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

  • H. Jones
  • W. Kurz
Transport Phenomena
Received:

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 toK 1 V 1/2 withK 1 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 +K 2 V n ] withD as diffusion coefficient of carbon in the melt andK 2 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 <V < 65 µm/s), these observed growth transitions are consistent with the derived relationships governing growth temperatures on the basis of competitive growth,i.e. that the growth form with the highest growth temperature at a particularV should prevail. The results are then applied to derive the limiting conditions for growth of grey and white eutectics as a function of composition in Fe-C (i.e. their coupled zones). The significance of observed dependences onV of volume fraction and spacing of austenite dendrites is discussed.

Keywords

Austenite Metallurgical Transaction Growth Temperature Cementite Growth Velocity 
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Copyright information

© American society for metals and the metallurgical society of AIME 1980

Authors and Affiliations

  • H. Jones
    • 1
  • W. Kurz
    • 2
  1. 1.University of SheffieldSheffieldEngland
  2. 2.Department of Materials EngineeringSwiss Federal Institute of TechnologyLausanneSwitzerland

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