Analysis of long-term creep curves by constitutive equations

摘要: Abstract Long-term creep curves up to the secondary stage (time >105 h) for carbon steel, 1.25Cr–0.5Mo–Si 2.25Cr–1Mo and SUS316 steel were analyzed by means of constitutive equations. A power-law equation well fitted actual long-term all steels, whereas exponential-law equation, logarithmic-law Blackburn's could not represent beginning primary during testing. All equations reproduced short-term steels. For parameters obtained from data analysis at higher stresses extrapolated lower predict curve. However, none predicted agreed with curves, although prediction was better than those other