SEDL / STP / STP128-EB / STP41689S

Recovery and Creep in an Alloy Steel

Lequear, H. A.
General Electric Research Laboratory, Schenectady, N.Y.

Lubahn, J. D.
General Electric Research Laboratory, Schenectady, N.Y.

Pages: 21    Published: Jan 1953

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Abstract

By interrupting a creep test and observing that the creep rate is higher afterward than before by amounts increasing with the duration of the interruption, it is possible to establish that recovery (reduction of the amount of strain hardening) has occurred. Recovery occurs in quenched-and-tempered chromium-molybdenum-vanadium steel at 1000F, but not at 800F.

When recovery occurs, the plastic creep rate becomes constant—sooner for smaller stresses, and apparently immediately for a sufficiently small stress. When recovery does not occur, the plastic creep rate decreases continuously. Recovery does not cause the creep, however, for pronounced creep occurs at temperatures where no recovery occurs.