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

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Abstract

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 n p ). 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.

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Notes

  1. IN718 is a trademark of INCO Alloys International, Huntington, WV.

  2. JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.

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Author notes

  1. K.V.U. Praveen (Senior Engineer, R&D)

    Present address: RAPSRI Engineering Industries Ltd, Bangalore, 560 061, India

Authors and Affiliations

  1. Department of Metallurgical Engineering, Institute of Technology, Banaras Hindu University, Varanasi, 221 005, India

    K.V.U. Praveen (Senior Engineer, R&D), G.V.S. Sastry (Professor) & Vakil Singh (Professor)

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  1. K.V.U. Praveen
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  2. G.V.S. Sastry
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  3. Vakil Singh
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Correspondence to K.V.U. Praveen.

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Manuscript submitted October 7, 2006.

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Praveen, K., Sastry, G. & Singh, V. Work-Hardening Behavior of the Ni-Fe Based Superalloy IN718. Metall Mater Trans A 39, 65–78 (2008). https://doi.org/10.1007/s11661-007-9375-3

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