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APPLICABILITY OF CREEP CONSTITUTIVE EQUATIONS TO CREEP CURVES UNDER CONSTANT LOAD

Y.Kurata and H.Utsumi (Japan Atomic Energy Research Institute , Tokai-mura , Naka-gun , Ibaraki-ken , 319-1195 , Japan)(Tohoku University , Sendai , 980-8579 , Japan)

金属学报(英文版)

Applicability of the following creep constitutive equations was investigated for normal type creep curves of Ni-18.5Cr alloy and tertiary creep dominant curves of Ni-18.5Cr16W alloy under constant load: the θ projection method describing a creep curse by a sum of two exponential terms, modified θ method describing a primary creep stage by an exponential term and a tertiary creep stage by a logarithmic term, modified Ω method describing a creep curve by a sum of two logarithmic term, 2θ method with only a tertiary creep component and Ω method. The θ, modified θ and modified Ω methods can describe normal type and tertiary creep dominant curves. Tertiary creep dominant curves of Ni-18.5Cr-16W alloy at 900℃ are also described using 2θ and Ω methods. Applicability of the modified θ and modified Ω methods is superior for constant load creep curves because they can predict creep curves up to rupture and rupture life accurately and conservatively.

关键词: creep equation , null , null , null , null