Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Evaluation of Creep Deformation and Rupture Life of 1.3Mn-0.5Mo-0.5Ni Steel by Modified θ Projection Concept
Hideaki KUSHIMATakashi WATANABEKoichi YAGIKouichi MARUYAMA
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1992 Volume 78 Issue 6 Pages 918-925

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Abstract

Creep curves of 1.3Mn-0.5Mo-0.5Ni steel were analyzed using the modified θ projection concept based on the following equation:
ε=ε0+A{1-exp(-αt)}+B{exp(αt)-1}
where ε is the strain, t is the time, and ε0, A, B and α are the parameters determined by curve fitting. The equation could describe the measured creep curves over the whole creep stages up to 90 percent of the rupture life. The modified θ projection concept could successfully predict long term rupture lives obtained independently on the same material.
Heat-to-heat variations in creep properties were discussed on the basis of the creep curve analysis. The parameters ε0, A and α were invariable among all the heats investigated. Only the parameter B related to the weakening process was different among the heats, indicating that the difference in the weakening parameter B was primarily responsible for the heat-to-heat variations.

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© The Iron and Steel Institute of Japan
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