Improving the High Temperature Creep and Rupture Resistance of Oxide- Dispersion-Strengthened Alloys
Final rept. Sep 1980-31 Mar 1982
CASE WESTERN RESERVE UNIV CLEVELAND OH
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The deformation annealing response of the ODS Oxide-Dispersion- Strengthened alloy MA 754 was examined in the effort to develop a thermomechanical technique whereby the alloy can be brought to near finish shaped components while at the same time improving the high temperature performance characteristics of the material. Major emphasis placed on 1 characterization of the as-received material in order to establish base - line properties, and 2 the evaluation of various thermomechanical processing schedules combining cold working by rolling and annealing in order to attain the most favorable grain morphology. The as-received alloy was found to be very amenable to cold rolling initial experiments produced reductions on the order of 70. Subsequent strain energy relaxation treatments however, were unsuccessful in stabilizing the improved grain morphology produced by cold rolling. Utilization of a revised cold rolling plus anneal schedule one involving step-wise cold working and annealing was found to permit reductions on the order of at least 40 while still maintaining a stable large grained structure.
- Metallurgy and Metallography
- Fabrication Metallurgy