Work-Hardening Behavior of the Ni-Fe Based Superalloy IN718

Flow behavior of many metals and alloys in the region of uniform plastic strain is normally expressed by the simple power law relationship (σ = Kε p n ). However, deviations have been observed from such behavior in several fcc metallic materials with low stacking fault energy. The age-hardenable nic...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2008, Vol.39 (1), p.65-78
Main Authors: Praveen, K.V.U., Sastry, G.V.S., Singh, Vakil
Format: Article
Language:English
Subjects:
Alloys
Applied sciences
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion resistance
Deformation
Electric resistance
Exact sciences and technology
Gas turbine engines
Grain boundaries
Materials Science
Metallic Materials
Metallurgy
Metals. Metallurgy
Nanotechnology
Residual stress
Strain hardening
Stress-strain curves
Structural Materials
Surfaces and Interfaces
Thin Films
Transmission electron microscopy
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Summary:Flow behavior of many metals and alloys in the region of uniform plastic strain is normally expressed by the simple power law relationship (σ = Kε p n ). However, deviations have been observed from such behavior in several fcc metallic materials with low stacking fault energy. The age-hardenable nickel-iron base superalloy IN718 is also observed not to obey the simple power law relationship either in the solution treated as well as in the different age-hardened conditions. Various flow relationships were used to obtain the best fit for the experimental data, and different relationships were identified for the different heat-treated conditions. Detailed transmission electron microscopy (TEM) examination of the tensile-tested samples, interrupted after different amounts of strain, revealed inhomogeneous deformation by planar slip in all the heat-treated conditions. Cold rolling, however, was found effective in eliminating the unusual plastic flow behavior, observed in the as-heat-treated conditions.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-007-9375-3