ハステロイXRの900℃での定常および非定常多軸応力クリープ

概要

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Creep of Hastelloy XR in steady and nonsteady multiaxial stress states was investigated experimentally by use of thin-walled tubular specimens at 900℃ in air. The following stress conditions were applied to the specimens; (I) four kinds of combined constant tension-torsion, and (II) three kinds of constant tension superposed to cyclically reversed torsion. It was observed that, while only secondary creep prevails under steady stress conditions because of the very high test temperature, cyclically reversed torsion induces marked increase of creep strain rate (i.e., cyclic softening). However, this cyclic softening phenomenon was found to become less noticeable with increase of superposed constant tension. Moreover, the validity of Mises' flow rule was ascertained except just after nonproportional changes of stress state.
一般社団法人日本機械学会の論文
1987-07-25