Modeling Creep Strength of Welded 9 to 12 Pct Cr Steels
2010 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 41A, no 13, 3340-3347 p.Article in journal (Refereed) Published
The influence of weld simulated heat treatments of 9-12% steels is evaluated by a fundamental model for creep. The heat affected microstructure is predicted by considering particle coarsening, particle dissolution, and subgrain coarsening. Particle coarsening is predicted for a multi-component system, showing significant M23C6 coarsening in the BCC matrix. Dissolution simulations of MX and M23C6 are performed by considering a size distribution of particles, indicating that the smallest particles can be dissolved already at relatively low welding temperatures. Recovery in dislocation networks will take place due to the coarser particles. Creep rate modelling is performed based on the heat affected microstructure, showing strength reduction of weld simulated material by 12% at 850ºC and 26% at 900ºC. The main cause of this degradation is believed to be the loss of the smallest carbonitrides.
Place, publisher, year, edition, pages
2010. Vol. 41A, no 13, 3340-3347 p.
Carbonitrides, Cr steel, Creep rates, Creep strengths, Dislocation networks, Distribution of particles, Fundamental models, matrix, Multi-component systems, Particle coarsening, Particle dissolution, Simulated materials, Strength reduction, Subgrain-coarsening, Welding temperatures, Carbon nitride, Chromium, Computer simulation, Creep, Dissolution, Welding, Welds
IdentifiersURN: urn:nbn:se:kth:diva-12234DOI: 10.1007/s11661-010-0449-2ISI: 000283943900010ScopusID: 2-s2.0-78049442090OAI: oai:DiVA.org:kth-12234DiVA: diva2:306594
QC 2010616. Updated from submitted to published, 201203152010-03-302010-03-302012-03-15Bibliographically approved