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Possible effect of Co on coarsening of M23C6 carbide and Orowan stress in a 9% Cr steel
KTH, Superseded Departments, Metallurgy.
2001 (English)In: ISIJ International, ISSN 0915-1559, Vol. 41, no 4, 356-360 p.Article in journal (Refereed) Published
Abstract [en]

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 degreesC decreases with 30 % with a Co addition of 10 mass %. This raises the Orowan stress with 30 %. Moreover, ii is assumed that slower particle coarsening also leads to a retarded coarsening of the martensite lath structure.

Place, publisher, year, edition, pages
2001. Vol. 41, no 4, 356-360 p.
Keyword [en]
DICTRA, coarsening, Ostwald ripening, chromium steel, precipitate hardening, alloys
URN: urn:nbn:se:kth:diva-20544ISI: 000168226500007OAI: diva2:339240
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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