Creep Behavior of the Inconel 718 Superalloy

Tarcila Sugahara; Karina Martinolli; Danieli A.P. Reis; Carlos de Moura Neto; Antônio Augusto Couto; F. Piorino Neto; M.J.R. Barboza

doi:10.4028/www.scientific.net/DDF.326-328.509

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Characteristics and Wear Performance of Nitrided Ti6Al4V
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Fluoride Influence on the Properties of Oxide Layer Produced by Plasma Electrolytic Oxidation
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Modifying the Sorption Capacity of Biopolymers by the Mechanochemical Activation
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Creep Behavior of the Inconel 718 Superalloy
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Determination of Creep Parameters of Ti-6Al-4V with Bimodal and Equiaxed Microstructure
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The Analysis of Heat Transfer and Thermal Stresses in Thermal Barrier Coatings under Exploitation
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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vols. 326-328Creep Behavior of the Inconel 718 Superalloy

Creep Behavior of the Inconel 718 Superalloy

Abstract:

A superalloy is an alloy developed for elevated temperature service, where relatively severe mechanical stressing is encountered, and where high surface stability is frequently required. High temperature deformation of Ni-base superalloys is very important since the blades and discs of aero engine turbine, because need to work at elevated temperature for an expected long period. The nickel-base alloy Inconel 718 has being investigated because it is one of the most widely used superalloys. The objective of this work was to evaluate the creep behavior of the Inconel 718 focusing on the determination of the experimental parameters related to the primary and secondary creep states. Constant load creep tests were conducted with at 650, 675 and 700°C and the range of stress was from 625 to 814 MPa to according to ASTM E139 standard. The relation between primary creep time and steady-state creep rate, obeyed the equation for both atmospherics conditions at 650, 675 and 700°C. The microstructural characterization employing the technique of scanning electron microscopy has been a valuable tool for understanding the mechanisms of creep.