Influence of laves phase on creep strength of modified 9Cr-1Mo steel

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DOIResolve DOI: http://doi.org/10.1016/j.msea.2017.08.111
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TypeArticle
Journal titleMaterials Science and Engineering: A
ISSN0921-5093
Volume706
Pages279286
Subjectlaves phase; modified 9cr-1mo steel; creep; deformation-mechanism-based model; heat treatment
AbstractThe influence of Laves phase in the microstructure on the creep strength of a modified 9Cr-1Mo tempered ferritic steel, F91, is investigated in this research. Through additional aging heat treatment up to 5000 h, a pronounced increase of Mo-rich Laves phase is found around Cr-rich carbide M23C6, which is pinned on the prior-austenite grain boundaries and martensitic lath boundaries. This secondary precipitation hardening provided by the Laves phase is rapidly offset by its coarsening into large clusters during long-term thermal exposure and under creep conditions, leading to earlier creep rupture than the pristine material. Uniaxial constant-load creep tests are conducted on both aged and non-aged coupons under the same creep conditions. The creep rupture behavior of both materials is rationalized with the assistance of a deformation-mechanism-based true-stress creep model that was developed in the previous work. The effects of Laves phase on the creep strength of F91 are related to its influence on the well-recognized existing deformation mechanisms: dislocation glide, dislocation climb, and grain boundary sliding.
Publication date
PublisherElsevier
LanguageEnglish
AffiliationAerospace; National Research Council Canada
Peer reviewedYes
NPARC number23002393
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Record identifierc3aac031-0ead-4924-9675-34bb21239058
Record created2017-10-26
Record modified2017-10-26
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