Calculation of the internal stresses and strains in the microstructure of a single crystal nickel-base superalloy during creep

Journal Article · Wed Dec 01 04:00:00 EST 1993 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(93)90220-M· OSTI ID:5875525

Mueller, L; Glatzel, U; Feller-Kniepmeier, M ^[1]

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1. Technische Univ. Berlin (Germany). Inst. fuer Metallforschung

The evolution of internal stresses and strains in the microstructure of a single crystal nickel-base alloy during annealing and during creep in [001] directions has been calculated using a visco-plastic model. Two limiting conditions are considered: an overloading case where the internal stresses reach the critical resolved shear stress of the whole [gamma][prime] volume and an underloading case where the critical resolved shear stress of the [gamma][prime] precipitate is reached only at distinct areas. During creep deformation a triaxial stress state evolves in the microstructures and large pressure gradients are built up. The influences of an initial coherency misfit is shown to be negligible after short times of creep. The calculations allow the prediction of flow patterns in the microstructure, creep-induced lattice parameter changes, type and arrangement of interfacial dislocations and of the dependence of the stationary strain rate on the cube or plate morphology of the [gamma][prime] phase.

• OSTI ID: 5875525
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 41:12; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CREEP
LATTICE PARAMETERS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL BASE ALLOYS
PHASE STUDIES
STRAINS
STRESSES