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Influence of W in solid solution on the creep rate of nickel
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
2019 (English)In: PROCEEDINGS OF THE ASME PRESSURE VESSELS AND PIPING CONFERENCE, 2018, / [ed] Qian, H; Brongers, M; Uddin, M, AMER SOC MECHANICAL ENGINEERS , 2019Conference paper, Published paper (Refereed)
Abstract [en]

Ni and Ni-W binary alloys are basis for nickel based superalloys. For most nickel based superalloys, strengthening mechanisms include both solid solution hardening and precipitation hardening. W is a vital element to create solid solution hardening and to improve the creep strength. In spite of its wide usage to strengthening of high temperature alloys, the mechanisms for solid solution hardening are not fully quantified. From the assumption that it is due to the attraction of solute atoms to dislocations and formation of Cottrell atmosphere to slow down the motion of dislocations, a fundamental model has been formulated previously. In the present paper, the model is expanded by taking the stacking fault energy and strain induced vacancies into account. Important parameters in the model are the variation of the lattice constant and the shear modulus with alloying content. Models for these variations have been formulated as a function of solute content. Another important parameter is the maximum interaction energy between the dislocations and the solutes. The model can satisfactorily predict both the large difference in creep rate between pure Ni and Ni-W alloys and the comparatively smaller differences between the three investigated Ni-2W, Ni-4W and Ni-6W alloys.

Place, publisher, year, edition, pages
AMER SOC MECHANICAL ENGINEERS , 2019.
Keywords [en]
LATTICE-PARAMETERS; BEHAVIOR; MODELS
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-248107ISI: 000460998900048Scopus ID: 2-s2.0-85056875021OAI: oai:DiVA.org:kth-248107DiVA, id: diva2:1307734
Conference
ASME 2018 Pressure Vessels and Piping Conference, PVP 2018; Prague; Czech Republic; 15 July 2018 through 20 July 2018
Note

QC 20190429

Available from: 2019-04-29 Created: 2019-04-29 Last updated: 2019-04-29Bibliographically approved

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Sandström, Rolf

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