Abstract
A stress-strain response of 21/4 Cr-1 Mo steel at 550°C was investigated, based on the creep-fatigue test results obtained by the authors, as shown in the previous report The following observations were made. The stress-strain response of this material is not affected by a test environment but by loading conditions. Internal stresses were determined from an analysis of unloading curves. The internal stress consists of a back stress and a drag stress. A drag stress corresponds to the radius of an elastic core. The overstress was also determined phenomenologically. The value of the overstress of this material does not depend either on the inelastic strain rate or the strain range thus far as investigated. Back stress softens as the material softens, but the overstress and drag stress are almost constant until failue. The above observations are compared with those for 304 steel.
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