Creep Strain and Creep-Life Prediction for Alloy 718 Using the Omega Method

The creep behavior of Alloy 718 was investigated in relation to the MPCs omega (Ω) method. Tb evaluate the creep model and determine material parameters. constant load creep tests were performed at different initial stresses in a temperature range between 550℃ and 700℃. The imaginary initial strain...

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Bibliographic Details
Published inMetals and materials international Vol. 9; no. 6; pp. 555 - 560
Main Authors Jong Taek Yeom, Jong Yup Kim, Young Sang Na, Nho Kwang Park
Format Journal Article
LanguageKorean
Published 대한금속재료학회 01.12.2003
Subjects
alloy 718
creep
hyperbolic-sine formation
omega method
γ″ coarsening
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Summary:The creep behavior of Alloy 718 was investigated in relation to the MPCs omega (Ω) method. Tb evaluate the creep model and determine material parameters. constant load creep tests were performed at different initial stresses in a temperature range between 550℃ and 700℃. The imaginary initial strain rate (ε0) and omega (Ω), considered to be important variables in the model, were expressed as a function of initial stress and temperature. For these variables, power-law and hyperbolic sine-law equations were used as constitutive equations for the creep of Alloy 718. To consider the effect of γ″ coarsening leading to a radical drop of tensile strength and creep strength at temperatures above 650℃, different material constants at the temperatures above 650℃ were applied. The reliability of the models was investigated in relation to the creep curve and creep life.
Bibliography:The Korean Institute of Metals and Materials
ISSN:1598-9623
2005-4149