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A thermodynamically consistent constitutive model for diffusion-assisted plasticity in Ni-based superalloys
Univ Oxford, England.
Univ Oxford, England.
Univ Oxford, England.
Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Konstruktionsmaterial. Linköpings universitet, Tekniska fakulteten.ORCID-id: 0000-0002-8304-0221
Vise andre og tillknytning
2018 (engelsk)Inngår i: International journal of plasticity, ISSN 0749-6419, E-ISSN 1879-2154, Vol. 105, s. 74-98Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

An elasto-viscoplastic thermodynamically consistent constitutive model for diffusion-assisted phase transformations is presented here. The model accounts for the different deformation mechanisms, their time dependence, the crystal rotations produced by microtwin propagation and the chemistry-plasticity coupling occurring at high temperature. It is applied to the study of the chemically assisted microtwinning observed in Ni-based superalloys in the temperature range of 600-800 degrees C. The model parameters are calibrated against multi-directional mechanical data from tensile creep tests of single crystal superalloy MD2. The constitutive model is then implemented into a crystal plasticity finite element code to study the activation of the different deformation mechanisms within single crystal and polycrystalline aggregates. Doing so, a relation between the rotations of the crystal and the creep life of the different crystal orientations is established. The results eventually reveal the critical role of the strong anisotropy of microtwin formation on the asymmetric behavior of the alloy and its relevant role on the mechanical performance.

sted, utgiver, år, opplag, sider
PERGAMON-ELSEVIER SCIENCE LTD , 2018. Vol. 105, s. 74-98
Emneord [en]
Creep; Crystal plasticity; Ni-based superalloys; Phase-transformation
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-148243DOI: 10.1016/j.ijplas.2017.12.007ISI: 000432506500004OAI: oai:DiVA.org:liu-148243DiVA, id: diva2:1213607
Merknad

Funding Agencies|EPSRC [EP/M50659X/1]

Tilgjengelig fra: 2018-06-05 Laget: 2018-06-05 Sist oppdatert: 2018-06-05

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