Abstract
ABSTRACTThe creep deformation behaviour and its effect on the creep life and rupture ductility are investigated for W-Mo-balanced 9Cr steels at 600 °C to 700 °C. The creep life is described as tr = 1.5/[min (dln/d)], where min and dln/d reflect the creep deformation behaviour in the transient and acceleration creep regions, respectively. The creep life is also correlated with the time to minimum creep rate tm as tr = gtm, where g slightly increases with decreasing stress. The logarithm of creep rate linearly increases with strain in the initial stage of acceleration creep region. This is followed by a decrease in dlnd with strain at high stresses, resulting in ductile failure at large strains, while it is followed by an increase in dln/d with strain at low stresses, resulting in rupture at small strains.
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