Development of microstructure in isothermally forged Nimonic alloy AP1

Autor:	J. W. Brooks, Paul Blackwell, P. S. Bate
Rok vydání:	1998
Předmět:	Materials science Mechanical Engineering Metallurgy technology industry and agriculture Nimonic Condensed Matter Physics Microstructure Forging Isothermal process Mechanics of Materials Ultimate tensile strength Volume fraction General Materials Science Deformation (engineering) Tensile testing
Zdroj:	Materials Science and Technology. 14:1181-1188
ISSN:	1743-2847 0267-0836
DOI:	10.1179/mst.1998.14.11.1181
Popis:	The development of microstructure in the nickel alloy Nimonic AP1 owing to isothermal forging and subsequent heat treatment has been investigated. The microstructure initially consisted of coarse grains, which corresponded to the prior powder particles; these were surrounded by a coarse dispersion of γ′. On deformation, the volume fraction of material with a coarse γ′ dispersion increased, and this was associated with localised grain refinement following heat treatment. High volume fractions of this structural type gave some increase in tensile strength but reduced stress rupture life and increased fatigue crack growth rates. High temperature compression tests were used to develop a constitutive equation for the material which was then applied, via a finite element model, to simulate the isothermal forging process. The relationships between deformation and structural development, the modelling, and the mechanical properties are discussed. The approach is potentially useful for the design of forgin...
Databáze:	OpenAIRE
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