ISSN:
1573-4889
Keywords:
Austenitic steels
;
carburization
;
carbon diffusion
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00656570
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