MECHANISMS ASSOCIATED WITH LONG TIME CREEP PHENOMENA. PART I. PRESENTATION OF CREEP DATA AND STRUCTURAL ANALYSIS
Final rept. Mar 1961-Jul 1964
NEW ENGLAND MATERIALS LAB INC MEDFORD MA
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A creep-tupture 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 to 20,000 hours at 1200, 1350, 1500, 1650, and 1800 F. Additional long time test with expected lives up to 50,000 hours were initiated and are still in progress. The test data were supplemented by extensive examination of structural changes during testing as well as the nature of crack initiation and propagation as a function of stress, temperature, and time. Additional groups of tests at particular stresses and temperatures were run to establish the reproducibility of data. The intent was to characterize thoroughly the materials, their structures, and the nature of deformation and fracture processes in order to evaluate the applicability of extrapolation procedures.
- Properties of Metals and Alloys