Accession Number : AD0631545

Title :   THE EFFECTS OF THREE AQUEOUS ENVIRONMENTS ON HIGH STRESS LOW-CYCLE FATIGUE OF 18% NICKEL MARAGING STEELS.

Descriptive Note : Memorandum rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Beachem,C. D. ; Lupton,T. C.

Report Date : FEB 1966

Pagination or Media Count : 33

Abstract : Base plate and weld specimens of 200 ksi and 250 ksi (nominal yield) grades of 18% Ni maraging steels were tested as side-grooved plane-strain cantilever beam specimens in distilled water, water 'inhibited' with NaCrO4, and 3-1/2% NaCl solution, to determine the susceptibilities of these steels to both corrosion fatigue and sustained load crack growth. Stress intensities below which negligible crack growth occurred during twenty cycles were found to be about 95% of K sub Ic for 250 grade base plate in distilled water, 73% of K sub Ic for 250 grade tested in either the salt water or the sodium chromate solution, 88% of K sub Ic for the 200 ksi grade base plate in all three environments, and essentially 100% of K sub Ic for the 200 ksi weld metal in all three environments. Crack extension was found to be negligible in twenty cycles at a K sub I of 65 ksi square root inches in the 250 ksi grade welds in all environments. (Author)

Descriptors :   (*MARAGING STEELS, *FATIGUE(MECHANICS)), (*NICKEL ALLOYS, MARAGING STEELS), SODIUM COMPOUNDS, CHLORIDES, CHROMATES, STRESS CORROSION

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE