Carburization kinetics of heat-resistant steels |
| |
Authors: | G. M. Smith D. J. Young D. L. Trimm |
| |
Affiliation: | (1) Botany Works, I.C.I. Australia Operations Pty. Ltd, 2036 Matraville, N.S.W., Australia;(2) School of Chemical Engineering and Industrial Chemistry, The University of New South Wales, P.O. Box 1, 2033 Kensington, N.S.W., Australia |
| |
Abstract: | A series of 21 commercial austenitic heat-resistant alloys was carburized in H2-C3H6 atmospheres which were reducing to Cr2O3 and SiO2 and which provided a carbon activity of one. Reactions were carried out at 900 T 1100°C and the resulting depth of carburization was measured metallographically. All alloys showed parabolic carburization kinetics after an initial brief period, at low temperatures, of more rapid reaction. The apparent activation energies for carburization are discussed in terms of carbon solubilities and diffusion coefficients. It is concluded that Wagner's theory of internal oxidation is quantitatively applicable to simple alloys but not to alloys which contain additions of reactive elements. The effectiveness of additions of niobium, aluminum, titanium, and silicon is demonstrated and is discussed in the context of Wagner's theory. |
| |
Keywords: | Austenitic steels carburization carbon diffusion |
本文献已被 SpringerLink 等数据库收录! |
|