MECHANISMS ASSOCIATED WITH LONG TIME CREEP PHENOMENA. PART II: EVALUATION OF LONG TIME CREEP RESULTS
Annual summary rept. Jul 1964-Jul 1966,
NEW ENGLAND MATERIALS LAB INC MEDFORD MA
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A creep-rupture investigation was conducted on two 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 and 1800F. 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.
- Properties of Metals and Alloys