Results 261 to 270 of about 99,604 (299)
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Creep of udimet 500 during thermal cycling: I. The minimum creep rate
Metallurgical Transactions A, 1975The effect of rapid temperature cycling on the minimum creep rate of Udimet 500 super-alloy was investigated. It was found that an abrupt temperature decrease during creep is followed by a delay period of zero creep rate. Due to this delay period the creep rate under thermal cycling conditions is lower than the creep rate calculated from the steady ...
I. Weiss, A. Rosen, D. G. Brandon
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Constitutive equations of the minimum creep rate for 9% Cr heat resistant steels
Materials Science and Engineering: A, 2012This study addresses the overestimation of the time-temperature-parameter (TTP) method on the allowable creep strength of 9-12% Cr heat resistant steels. Creep data of 9% Cr heat resistant steels are divided into several data sets according to the creep controlling mechanism.
Y.X. Chen +4 more
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The relationship between minimum creep rate and rupture time in Cr-Mo steels
Journal of Materials Engineering and Performance, 1992The Monkman-Grant equation is widely used to relate the minimum creep rate, emin,and the rupture time, tr, in creep. However, for materials that exhibit large tertiary creep and limited secondary creep, the above equation has not been found to be valid, and a correction in terms of the rupture strain er and the strain at the onset of tertiary stage ...
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Minimum creep rate from primary creep using strain relaxation and recovery test
Scripta Materialia, 2003Abstract Minimum creep rate and ‘irreversible’ viscous strain rate, evaluated by strain relaxation and recovery test, during primary creep in a nickel-based Waspaloy at 732 °C (0.62Tm) are shown to obey the same power-law with a stress exponent of 11 from 450 to 650 MPa. Viscous strain rate exhibits a continuous stress dependency from 315 to 725 MPa.
N.K. Sinha, T. Terada, P. Au
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Development and Application of Minimum Creep Strain Rate Metamodeling
Volume 7A: Structures and Dynamics, 2019Abstract Numerous minimum-creep-strain-rate laws exist, creating a challenge in determining which is best for a given material database. The objective of this study is to validate the applicability of a “metamodel” and its ability to model the minimum creep strain rate (MCR).
Ricardo Vega, Calvin Stewart
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On the minimum creep rate of β-cobalt
Philosophical Magazine, 1964Abstract Flinn and Gilbert (1964) recently re-plotted the graphs of Feltham and Myers (1963), relating the logarithm of the minimum tensile creep rate, e, of β-cobalt and the inverse of the temperature for creep at 720–1020°K. They maintain that on extrapolating the re-plotted graphs in a certain manner below the range of strain rates used in the ...
T. A. Myers, P. Feltham
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Analysis of the minimum creep rates of TiAl alloys
Materials Science and Engineering: A, 2003Abstract The creep rate limiting factors for secondary creep of TiAl alloys has been analyzed based on the experimental data from 40 previous studies. The experimental data can be well predicted using a dislocation glide (DG) equation e min ( DG )=K 0 exp (−Q L /RT) sinh (σ/σ 0 ) or a grain boundary ...
W.J. Zhang, S.C. Deevi
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Modeling the minimum creep rate of discontinuous lamellar- reinforced composites
Metallurgical and Materials Transactions A, 1995An analytical model has been developed to predict the creep rate of discontinuous lamellar-reinforced composites in which both phases plastically deform. The model incorporates effects associated with lamellar orientation relative to the uniaxial stress axis.
Michael F. Bartholomeusz, John A. Wert
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Minimum-creep-rate behavior of polycrystalline vanadium from 0.35 to 0.87 Tm
Acta Metallurgica, 1971Abstract The minimum-creep-rate behavior of polycrystalline vanadium was investigated over the temperature range of 477–1600°C (0.35–0.87 T m ). The uncorrected or apparent activation energy for creep was found to increase linearly with temperature from 56 to 121 kcal/mole over this temperature range as the stress was decreased from 14.7 to 0 ...
K.R Wheeler +3 more
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