Abstract
A creep constitutive equation in Hastelloy XR was developed at 900 and 950°C, following the previous report at 850°C. In the equation, the inelastic strain rate is written in the form of a flow equation of the Norton-Bailey type and the hardening during deformation under various loads is induced by an internal stress which is subdivided into back stress and friction stress. Parameters were determined by the deformation properties for creep under constant stress conditions at each temperature. In order to confirm the validity of these constitutive equations deformation curves and/or strain rate under creep, stress dip, stress relaxation and tensile tests were compared with the calculated results. The results showed good agreement at 900 and 950°C, respectively. Finally the temperature dependence of two internal parameters q0 and λ defined as a function of applied stress was discussed to determine those properties given to Hastelloy XR whose boron content was controlled to improve the creep resistance at high temperatures.
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