Accession Number : AD0664944

Title :   DSSP PROGRAM ON HIGH-STRENGTH MATERIALS EVALUATION OF 350 KSI, 18% NICKEL MARAGING STEEL.

Descriptive Note : Memorandum rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Stonesifer,F. R. ; Smith,H. L.

Report Date : DEC 1967

Pagination or Media Count : 14

Abstract : The report describes the study of one material for possible use in the pressure hull of a deep submergence vehicle operating at depths up to 20,000 feet. A pressure hull operating at these depths with a satisfactory weight/displacement ratio requires one to look at materials which might otherwise be classified as too brittle to consider for structural purposes. The material was a 350 ksi, 18% nickel-cobalt-molybdenum maraging steel. Since fracture strength in general decreases with increasing yield strength one would expect somewhat low critical stress-intensity parameter or K sub Ic values at this strength level. However, laboratory heats were giving higher than usual elongations of the order of 10%. It was felt worthwhile to investigate the fracture toughness characteristics of both base plate and welds. (Author)

Descriptors :   (*MARAGING STEELS, *SUBMARINE HULLS), DEEP SUBMERGENCE, COBALT ALLOYS, MOLYBDENUM ALLOYS, FRACTURE(MECHANICS), TOUGHNESS, METAL PLATES, WELDS

Subject Categories : Metallurgy and Metallography
      Submarine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE