Microstructure and micro-texture evolution during large strain deformation of Inconel alloy IN718

The hot deformation behaviour of Inconel alloy IN718 was studied in the temperature range of 950–1100°C and at strain rates of 0.01 and 1s−1 with a view to understand the microstructural evolution as a function of strain rate and temperature. For this purpose, a single hit, hot isothermal plane stra...

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Bibliographic Details
Published in:Materials characterization 2015-12, Vol.110, p.236-241
Main Authors: Nayan, Niraj, Gurao, N.P., Narayana Murty, S.V.S., Jha, Abhay K., Pant, Bhanu, George, Koshy M.
Format: Article
Language:English
Subjects:
BACKSCATTERING
DEFORMATION
DIAGRAMS
Electron back scatter diffraction
ELECTRON DIFFRACTION
ELECTRON TEMPERATURE
Evolution
INCONEL ALLOYS
MATERIALS SCIENCE
MICROSTRUCTURE
Nickel base alloys
RECRYSTALLIZATION
ROLLING
Strain
STRAIN RATE
STRAINS
Superalloys
TEXTURE
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Summary:The hot deformation behaviour of Inconel alloy IN718 was studied in the temperature range of 950–1100°C and at strain rates of 0.01 and 1s−1 with a view to understand the microstructural evolution as a function of strain rate and temperature. For this purpose, a single hit, hot isothermal plane strain compression (PSC) technique was used. The flow curves obtained during PSC exhibited weak flow softening at higher temperatures. Electron backscattered diffraction analysis (EBSD) of the PSC tested samples at the location of maximum strain revealed dynamic recrystallisation occurring at higher temperatures. Based on detailed microstructure and microtexture analyses, it was concluded that single step, large strain deformation has a distinct advantage in the thermo-mechanical processing of Inconel alloy IN718. •Plane strain compression (PSC) on IN718 was conducted.•Evolution of microstructure during large strain deformation was studied.•Flow curves exhibited weak softening at higher temperatures and dipping of the flow curve at a strain rate of 1s−1.•Optimization of microstructure and process parameter for hot rolling possible by plane strain compression testing•Dynamic recrystallisation occurs in specimens deformed at higher temperatures and lower strain rates.
ISSN:1044-5803
1873-4189
DOI:10.1016/j.matchar.2015.10.027