K. Kimura et al., EFFECT OF THERMAL AGING ON THE COMPLEX CR EEP DEFORMATION-BEHAVIOR OFCARBON-STEEL AND ITS INHERENT CREEP STRENGTH, Tetsu to hagane, 82(8), 1996, pp. 713-718
Complex creep deformation behaviour which reveals several peaks and lo
cal minima in creep strain rate has been investigated on the carbon st
eel taken from tube for boilers and heat exchangers (JIS STB 410) and
discussed from a view point of ''Inherent Creep Strength''. Complex cr
eep deformation phenomena observed on the un-aged steel has been disap
peared by ageing prior to creep test. Common creep Strain dependence o
f creep strain rate has been observed for both steels with and without
prior ageing, and explained by both an inherent creep strength and an
increase in stress during constant load creep testing. It has been co
ncluded that complex creep deformation behaviour is caused by decrease
in creep strength due to microstructural change and advent of inheren
t creep strength.