NASA Technical Reports Server (NTRS) 19720024270: Time-dependent edge notch sensitivity of Inconel 718 sheet in the temperature range 900 to 1400 F (482 to 760 C)

by: NASA Technical Reports Server (NTRS)

Publication date: 1972-04-01

Topics: NASA Technical Reports Server (NTRS), HIGH TEMPERATURE RESEARCH, INCONEL (TRADEMARK), NOTCH SENSITIVITY, TIME DEPENDENCE, CREEP RUPTURE STRENGTH, HEAT TREATMENT, TENSILE TESTS, Wilson, D. J.,

Collection: NASA_NTRS_Archive; additional_collections

Language: English

Time-dependent notch sensitivity of Inconel 718 sheet occurred at 900 to 1200 F when notched specimens were loaded below the yield strength, and tests on smooth specimens showed that small amounts of creep consumed large fractions of creep-rupture life. The severity of the notch sensitivity decreased with decreasing solution treatment temperature and increasing time and/or temperature of the aging treatment. Elimination of the notch sensitivity was correlated with a change in the dislocation mechanism from shearing to by-passing precipitate particles.