Accession Number : AD0709904

Title :   FRACTURE PROPERTIES OF THE NEW DUAL STRENGTHENED 10% NICKEL STEEL IN TWO-INCH PLATE.

Descriptive Note : Memorandum rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Stonesifer,Fred R. ; Smith,Herschel L.

Report Date : JUL 1970

Pagination or Media Count : 16

Abstract : The new dual strengthened 10%Ni alloy appears particularly well suited for construction of large pressure vessels. An attractive combination of strength, toughness, and resistance to corrosion; as reported by other investigators, is derived through a heat treatment which combines the advantages of conventional low-carbon martensite with those of the maraging mechanism. A two-inch thick plate of this new alloy was welded by the standard TIG process and evaluated in relation to its fracture toughness properties. When properly austenitized and aged, this material shows excellent toughness at the 180,000 psi yield strength level. Overaging increases the toughness but depresses the yield strength. A critical crack depth of about one inch is calculated for the base plate under severe conditions. Present inspection techniques should have no problem detecting a crack of such magnitude. (Author)

Descriptors :   (*STEEL, FRACTURE(MECHANICS)), NICKEL ALLOYS, METAL PLATES, PRESSURE VESSELS, MELTING, VACUUM APPARATUS

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE