Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
A Predicting Method of the Creep Rupture Life of Nickel-Base Precipitation Hardened Superalloys from Chemical Composition
Junzo FUJIOKATakuya MIYASHITAHirokazu MURASEYukio NISHIYAMAShozo MATSUDA
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1982 Volume 68 Issue 3 Pages 486-495

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Abstract

The program for estimating the creep rupture life at 900°C from chemical composition has been developed on nickel-base precipitation hardened superalloys.
In this program, the steady state creep rate (εS) and the creep rupture life (tr) have been estimated by Evans-Harrison's and Monkman-Grant's equations, respectively, which have been represented by the following equations.
εS=B'{ (σ-σ0) /σ0.05}3.5 … (1)
log tr+m·log εS=c… (2)
σ, σ0 and σ0.05 are applied stress, friction stress and 0.05% proof stress, respectively. B' is the constant for all alloys. m and c are constants for each alloy. σ0, σ0.05, m and c have been represented as a function of structural factors calculated from chemical composition. Relationship between σ0 and structural factors has been led by the theoretical analysis based on the dislocation theory.
About 80% of the experimental creep rupture lives have fallen within a factor of two of the estimated lives at the various stress levels corresponding to the lives up to 104 h as for twenty eight alloys. Especially, for cast alloys with higher γ' volume fraction, the creep strength has been estimated accurately by this program.

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© The Iron and Steel Institute of Japan
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