Abstract
Biaxial (tension/torsion) creep and creep-fatigue tests were conducted on Hastelloy XR at 950°C in air. Hastelloy XR is a nickel base solution-annealed heat resistant alloy. Thin-walled tubulaf test specimens were employed. As results of the creep tests, the von Mises' flow rule was revealed to be applicable very well. Under the torsion load, sufficient growth of voids was necessary to initiate the fracture and this resulted in longer life time compared with that under the tension load. Only a few number of srnall voids could be observed and very long life times were attained under the compression load. The creep-fatigue tests revealed that superposition of constant torsion load on a cyclic axial load reduced the cycles to failure significantly and the amount of reduction was consistent with the prediction by the linear life fraction rule.
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