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Mechanisms Associated With Long Time Creep Phenomena. Part II: Evaluation Of Long Time Creep Results.

Report Number: AFML TR 65-181 Part 2
Author: Widmer, R.
Author: Dhosi, J. M.
Author: Grant, N. J.
Corporate Author: New England Materials laboratory, Inc.
Laboratory: Air Force Materials Laboratory
Date of Publication: 1967-03
Pages: 132
Contract: AF 33(615)-2452
Project: 7351 - Metallic Materials
Task: 735106 - Behavior of Metals
AD Number: AD0815679

A creep-rupture investigation was conducted on two (2) high temperature alloys: a nickel-base age hardened alloy, Udimet 500, and a cobalt-base alloy, L-605. Creep-rupture tests were conducted over a range of rupture lives from 1 - 35,000 hours at 1200, 1350, 1500, 1650 at 1800 degrees F. Some long time tests are in progress and lives of approximately 50,000 hours are expected. The microstructure of all broken specimens was examined with various techniques and an attempt was made to correlate specific structural changes with the mechanical properties. Several different parameter techniques were examined to determine their utility in correlating and extrapolating creep and rupture data. The strength and the limitations of parametric extrapolation was extensively discussed with the example of the Manson-Haford parameter for which a computer program was available.

Lockheed Martin Missiles & Fire Control
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