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Title: Creep properties at ambient temperature of some high strength steels.
Authors: Pollock, JTA
Barton, SG
Issue Date: Mar-1979
Publisher: Australian Nuclear Science and Technology Organisation
Abstract: Ambient temperature stress relaxation and creep data are reported at various stress levels for two grades of MAR300 steel, a MAR350 steel and a type 301 stainless steel. Analysis has shown that there is a linear relationship between the logarithm of time and relaxed stress, or creep strain. On the basis of this linear relationship, two parameters are calculated that are characteristic of the relaxation and creep behaviour at a given stress level. Using a conjugate relationship suggested by Felthat [1961 - Phil. Mat., 6:259; J. Inst. Met., 89:201], these characteristic parameters are compared to allow an assessment to be made of the possibility of deriving constant load creep characteristics from short-term stress relaxation data. Because of the difficulties in measuring some of the factors in this relationship, a large error band is associated with the derivation at stresses where the work hardening rate is very high. Nevertheless, in this difficult stress range, a working relationship is demonstrated which is sufficient to warrant the application of the approach if design information is required. At stresses in the range 1000-1500 N mm-2, creep increments per year of about 10-4 mm mm-1 were calculated from the experimental data for the maraging steels. In terms of creep increment per year, the type 301 stainless steel is roughly an order of magnitude inferior to the maraging steels over the same range of stress. At higher stresses in the range 1600-2150 N mm-2, which is beyond the applicability of the MAR300 steels or the type 301 stainless steel, an unchanged yearly creep increment of ~10-4 mm mm-1 was obtained with the MAR350 steel.
ISBN: 0642596654
Appears in Collections:Scientific and Technical Reports

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