Effect of Microstructure on Electrical Conductivity of Nickel-Base Superalloys
| Autor: | Sylvie Castagne, Balasubramanian Nagarajan, Wai Luen Chan, Swaminathan Annamalai, Zheng Fan |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Scanning electron microscope Annealing (metallurgy) Metallurgy Metals and Alloys 02 engineering and technology Conductivity 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Superalloy Mechanics of Materials Electrical resistivity and conductivity 0103 physical sciences Volume fraction Hardening (metallurgy) 0210 nano-technology |
| Popis: | © 2017, The Minerals, Metals & Materials Society and ASM International. Eddy current spectroscopy is one of the promising non-destructive methods for residual stress evaluation along the depth of subsurface-treated nickel-base superalloys, but it is limited by its sensitivity to microstructure. This paper studies the influence of microstructure on the electrical conductivity of two nickel-base alloys, RR1000 and IN100. Different microstructures were attained using heat treatment cycles ranging from solution annealing to aging, with varying aging time and temperature. Eddy current conductivity was measured using conductivity probes of frequencies ranging between 1 and 5 MHz. Qualitative and quantitative characterization of the microstructure was performed using optical and scanning electron microscopes. For the heat treatment conditions between the solution annealing and the peak aging, the electrical conductivity of RR1000 increased by 6.5 pct, which is duly substantiated by the corresponding increase in hardness (12 pct) and the volume fraction of γ′ precipitates (41 pct). A similar conductivity rise of 2.6 pct for IN100 is in agreement with the increased volume fraction of γ′ precipitates (12.5 pct) despite an insignificant hardening between the heat treatment conditions. The observed results with RR1000 and IN100 highlight the sensitivity of electrical conductivity to the minor microstructure variations, especially the volume fraction of γ′ precipitates, within the materials. ispartof: Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science vol:48 issue:8 pages:3745-3757 status: published |
| Databáze: | OpenAIRE |
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