ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Possible Effect of Co on Coarsening of M23C6 Carbide and Orowan Stress in a 9% Cr Steel
Åsa GustafsonJohn Ågren
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2001 Volume 41 Issue 4 Pages 356-360

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Abstract

It has long been known that a cobalt addition increases the resistance to tempering in steels. This may be due to the fact that Co raises the Curie-temperature which retards diffusion. In the present work the effect of Co on coarsening of M23C6 in the 9 % Cr steel P92 is studied by computer simulations. The results show that a final average radius of the carbides after 30 000 h at 600°C decreases with 30% with a Co addition of 10 mass%. This raises the Orowan stress with 30%. Moreover, it is assumed that slower particle coarsening also leads to a retarded coarsening of the martensite lath structure.

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© The Iron and Steel Institute of Japan
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