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Correlations Between Metallurgical Characterization Studies, Exploratory Mechanical Tests, and Continuum Mechanics Approaches to Constitutive EquationsAustenitic stainless steels, such as types 316 and 304, are widely used as pressure vessel materials in the temperature range of 425 to 650 C. Stainless steel specimens were tested to rupture at two different stress levels sigma and sigma 2 sigma 1 sigma 2) to establish the normal stain-time behavior. A subsequent test was performed in which the specimen was crept at the higher stress (sigma 1) to the beginning of the secondary stage of creep, presumed to be the strain/time conditions at which a steady state microstructure is developed, and then the stress was reduced to the lower level (sigma 2). The associated microstructure, and significance of this microstructure on the creep strain-hardening model for variable uniaxial loads were assesed and found to be consistent with the use of creep-recovery models at high stresses and temperatures and strain-hardening models at low stresses and tempertures.
Document ID
19830026095
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Moteff, J.
(Cincinnati Univ. OH, United States)
Pugh, C. E.
(Cincinnati Univ. OH, United States)
Swindeman, R. W.
(Cincinnati Univ. OH, United States)
Date Acquired
August 11, 2013
Publication Date
March 1, 1983
Publication Information
Publication: NASA. Lewis Research Center Nonlinear Constitutive Relations for High Temp. Appl.
Subject Category
Structural Mechanics
Accession Number
83N34366
Funding Number(s)
CONTRACT_GRANT: W-7405-ENG-26
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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