The effect of nitrogen on the coarsening rate of precipitate phases in iron-based alloys with chromium and vanadium: experimental and theoretical investigations
2013 (English)In: International Journal of Materials Research - Zeitschrift für Metallkunde, ISSN 1862-5282, Vol. 105, no 5, 442-451 p.Article in journal (Refereed) Published
A comparison of the coarsening of nitrogen-rich vanadium precipitates and the coarsening ofcarbon-rich vanadium precipitates is presented. The precipitate phases are studied experimentally,via fabrication of model alloys, and theoretically, via simulations utilizing the DICTRA software.The experimental investigations indicate that the nitrogen-rich precipitates exhibit a slowercoarsening behaviour than the carbon-rich precipitates. Analysis using thermodynamic andkinetic modelling shows that this can be explained by the higher thermodynamic stability of thenitrogen-rich precipitate compared to the carbon-rich precipitate. The calculated coarsening ratesare compared with the measured rates, and found to be in satisfactory agreement using reasonablevalues for the interfacial energies. The investigations are motivated by the ne precipitate sizedistribution of nitrides and carbonitrides characteristic for high nitrogen alloyed tool steels producedby means of powder metallurgy.
Place, publisher, year, edition, pages
2013. Vol. 105, no 5, 442-451 p.
Tool steels, Powder metallurgy, Nitrogen, HIP, Coarsening, DICTRA
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-103319DOI: 10.3139/146.110885ISI: 000320346600003OAI: oai:DiVA.org:kth-103319DiVA: diva2:559704
QC 20121010. Updated from accepted to published 20131212. 2012-10-102012-10-102013-12-02Bibliographically approved