K. Kimura et al., INHERENT CREEP STRENGTH AND LONG-TERM CREEP STRENGTH PROPERTIES OF FERRITIC STEELS, Materials science & engineering. A, Structural materials: properties, microstructure and processing, 234, 1997, pp. 1079-1082
Inherent creep strength is defined as a constant creep strength indepe
ndent of time and microstructure. Sigmoidal inflection of a relation b
etween stress and time to rupture is explainable in terms of a loss of
creep strength followed by the advent of inherent creep strength. Alt
hough a large variation of short term creep rupture strength is observ
ed, inherent creep strength is evaluated to be almost the same for sev
eral low alloy Cr-Mo steels. Creep rupture strength of the 12Cr-1Mo-1W
-0.3V steel is higher than the other steels investigated in the short
term region, however, it decreases with decrease in stress abruptly an
d it is almost the same as common inherent creep strength for low allo
y Cr-Mo steels. On the other hand, creep rupture strength of the modif
ied 9Cr-1Mo steel is higher than the other steels even at low stresses
. (C) 1997 Elsevier Science S.A.