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The Dissolution of titanium in liquid steel

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Abstract

The dissolution kinetics of solid cylinders of titanium in liquid steel has been studied. Two separate dissolution periods were identified: asteel shell period anda free dissolution period. During thesteel shell period a customary shell of frozen steel encased the cylinder following its initial immersion. Premature internal dissolution then began as a result of liquid eutectic forming at the inner steel shell boundary.This phenomenon triggered an exothermic dissolution of the inner surface of the steel shell. The net result was to shorten considerably shell melting times. In the second,or free dissolution period it was found that the surface temperature of the exposed titanium cylinder rose above the bath temperature as a result of continued exothermic dissolution phenomena. This caused the dissolution process to become self-accelerating. A simplified mathematical model of the process has been developed to describe the complex coupled heat and mass transfer phenomena involved.

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Abbreviations

αFe :

thermal diffusivity of iron

αTi :

thermal diffusivity of titanium

CTi :

concentration of titanium in titanium core

CFe/Ti :

concentration of titanium in the reaction zone

F NDF :

net downward force

F G :

gravitational force

F B :

buoyancy force

g :

gravitational constant

h :

convective mass transfer coefficient from steel bath

k Fe :

thermal conductivity of iron

k Ti :

thermal conductivity of titanium

K Ti :

mass transfer coefficient for titanium

LFe :

latent heat of iron

N′’Ti :

molar flux of titanium

Q′’GEN :

rate of heat generation per unit surface at the inner steel shell boundary

Q Ti :

heat released per mole of titanium reacting with iron

q′’ conv :

convective heat flux from steel bath

Q′’’ :

heat generation per unit volume and per unit time

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Authors and Affiliations

  1. Department of Metallurgical Engineering, McGill University, 3450 University Street, H3A 2A7, Montreal, Quebec, Canada

    Stavros A. Argyropoulos (Assistant Professor)

  2. sabbatical at University of Surrey, England

    Roderick I. L. Guthrie (Professor)

Authors
  1. Stavros A. Argyropoulos
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  2. Roderick I. L. Guthrie
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Argyropoulos, S.A., Guthrie, R.I.L. The Dissolution of titanium in liquid steel. Metall Trans B 15, 47–58 (1984). https://doi.org/10.1007/BF02661062

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