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  • 1970-1974  (1)
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    The development and evaluation of a cobalt base oxidation resistant dispersion strengthened alloy (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The Co-18Cr-20Ni-4 Vol % ThO2 powders were prepared by a flash drying selective reduction process starting with an aqueous solution of metal salts and colloidal thoria. Powders were consolidated and extruded into rods with a minimum density of 99% of theoretical. Swaging and annealing studies were conducted to determine the conditions that would lead to a product with high stress-rupture strength. The best process yielded a stress-rupture life of 7.2 hours at 10 KSI (69 MN sq m and 2000 F (1094 C). The alloy recrystallized to a duplex (coarse-fine) structure and thus did not exhibit the desired strength of 3000 hours at 15 KSI (103.5MN/sq m and 2000 F (1094 C).
    Keywords: MATERIALS, NONMETALLIC
    Type: NASA-CR-72900
    Format: application/pdf
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