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Creep strain modelling of particle strengthened material
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0002-8494-3983
2005 (English)In: Proceedings - ECCC Creep Conference: Creep and Fracture in High Temperature Components - Design and Life Assessment Issues, 2005Conference paper, Published paper (Refereed)
Abstract [en]

Creep strain curves for many materials (for example ferritic and austenitic steels, copper alloys) can accurately be described by a combination of one model for primary creep and one model for tertiary creep. The primary creep is represented by the Φ - model, while the tertiary creep follows the Ω -model. dεprim/dt= Φ1ε-Φ2 dεtert/dt= Ω1 exp{Ω2ε} ε is the creep strain, Φ1, Φ2, Ω1 and Ω2 are constants. In the present work a dislocation model has been developed for these two stages of creep deformation and applied to 9 and 12 % CrMoV steels. A modified version of the composite model for substructure is used. The model takes work hardening and recovery of dislocations into account both in the subgrain boundaries and the subgrain interiors. Orowan particle strengthening is used in the subgrain interiors and Zener drag in the subgrain boundaries. Thermodynamic modelling is used to describe subgrain and particle growth. Initiation and growth of creep cavities are also considered.

Place, publisher, year, edition, pages
2005.
Keyword [en]
Grain boundaries, Hardening, Mathematical models, Stainless steel, Strain control, Tertiary recovery, Thermodynamics, Austenitic steels, Composite models, modeling, Subgrain interiors, Creep testing
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-156278Scopus ID: 2-s2.0-33749320681ISBN: 1932078495 (print)ISBN: 9781932078497 (print)OAI: oai:DiVA.org:kth-156278DiVA: diva2:767513
Conference
ECCC Creep Conference: Creep and Fracture in High Temperature Components - Design and Life Assessment Issues, 12 September 2005 through 14 September 2005, London, United Kingdom
Note

QC 20141201

Available from: 2014-12-01 Created: 2014-11-26 Last updated: 2014-12-01Bibliographically approved

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Sandström, Rolf

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