Creep strain modelling of 9-12 Pct Cr steels based on microstructure evolution
2007 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 38, no 9, 2033- p.Article in journal (Refereed) Published
Creep deformation is simulated for 9 pct Cr steels by using the Norton equation with the addition of back stresses from dislocations and precipitates. The composite model is used to represent the heterogeneous dislocation structure found in 9 to 12 pct Cr steels. Dislocation evolution is modeled by taking capturing and annihilation of free dislocations into account. Recovery of immobile dislocations is derived from the ability of dislocation climb. In spite of the fact that the initial dislocation density is high and is reduced during creep, primary creep is successfully modeled for a P92 steel. Subgrain growth is evaluated using a model by Sandström (1977). The long time subgrain size corresponds well to a frequently used empirical relation, with subgrain size inversely proportional to the applied stress.
Place, publisher, year, edition, pages
2007. Vol. 38, no 9, 2033- p.
ferritic steels, stability, behavior
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-7324DOI: 10.1007/s11661-007-9256-9ISI: 000249538900020ScopusID: 2-s2.0-34548606418OAI: oai:DiVA.org:kth-7324DiVA: diva2:12302