Accession Number:

AD0271571

Title:

EFFECT OF CREEP-EXPOSURE ON MECHANICAL PROPERTIES OF RENE 41. PART II: STRUCTURAL STUDIES, SURFACE EFFECTS, AND RE-HEAT TREATMENT

Descriptive Note:

Rept. for 1 Apr 60-31 May 61 on Materials Application,

Corporate Author:

MICHIGAN UNIV ANN ARBOR

Personal Author(s):

Report Date:

1961-11-01

Pagination or Media Count:

1.0

Abstract:

Investigation of the influence of creep-exposure on the mechanical properties of Rene 41 at room temperature was continued. The results showed that thermally-induced structural changes reduced the strength and ductility for exposures at temperatures from 1400 to 1800 F. Reduced yield strength was due mainly to a decrease in the measured volume fraction of gamma prime precipitate and secondarily to an increase in the gamma prime particle size. For the conditions studied, gamma prime was sufficiently stable up to 1400 F so that yield strength was not affected. Ductility was reduced by thermally-induced carbide precipitation in the grain boundaries in the temperature range from 1400 to 1800 F. Ductility reached a minimum after about 100 hr at 1700 to 1800 F and was not further decreased by creep. Creep had little effect on the gamma prime reactions. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE