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Technical Briefs

Temperature Dependent Elastic Constants of Directionally Solidified Superalloys

[+] Author and Article Information
Chen-Ming Kuo

Department of Mechanical and Automation Engineering,  I-Shou University, Kaohsiung 84001, Taiwancmkuo@isu.edu.tw

J. Eng. Mater. Technol 134(2), 024501 (Mar 27, 2012) (4 pages) doi:10.1115/1.4006228 History: Received December 26, 2011; Revised February 21, 2012; Published March 27, 2012; Online March 27, 2012

Directionally solidified superalloys have been extensively used as turbine blade materials to improve creep-rupture and thermal fatigue performances. Turbine blades are subjected to fluctuant temperature changes. Precise knowledge of material behavior at various temperatures is essential in design and service life evaluation of turbine blades. In this study, coaxial model is extended to consider temperature dependent engineering elastic constants. Although no existing theory predicts the temperature dependence engineering elastic constants over large range of temperature, these constants could be estimated based upon very limited experimental data of direction solidification specimens and other temperature dependent materials data. Excellent agreement is observed between estimations and experimental data of 45 deg and 90 deg off directionally solidified direction specimens.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

A DS superalloy plate, where x′–y′–z′ refers to the physical coordinate, XYZ is the off-axis coordinate rotated an angle θ in the x′–y′ plane

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Figure 2

An individual grain in the coaxial model with material coordinate x-y-z, where x-axis is the solidification direction. The physical coordinate x′-y′-z′ is rotated an angle ϕ in the y-z plane.

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Figure 3

Temperature dependent Young’s modulus in the DS direction

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Figure 4

Temperature dependent Young’s modulus in the 45 deg off DS direction

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Figure 5

Temperature dependent Young’s modulus in the 90 deg off DS direction

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Figure 6

Temperature dependent Poisson’s ratios of nickel-based DS superalloys

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