Accession Number : AD0437104


Title :   EVALUATION OF 18NI-9CO-5MO (300 KSI) MARAGING STEEL SHEET. PART 1: MECHANICAL PROPERTIES,


Corporate Author : DOUGLAS AIRCRAFT CO INC SANTA MONICA CALIF


Personal Author(s) : Corn,D L


Report Date : 27 Nov 1963


Pagination or Media Count : 64


Abstract : This report covers the first phase of the study of the 18Ni-9Co-5Mo (300 ksi) maraging steels. The mechanical properties, including fracture toughness, are presented to demonstrate its utility for high strength pressure vessels. Uniaxial yield and ultimate strengths are reported for aging heat treatments ranging from 750 F for 312 hours (13 days) to 1050 F for 18 hours. Mechanical properties are also presented for the annealed condition as well as the effect of annealing temperature on aged strengths. The annealing study verified that austenite is stabilized in the 1200 to 1250 F annealing range. Duplex aging cycles were also investigated and were shown to be capable of achieving higher strengths than could be obtained with a single aging heat treatment in the same amount of time. (Author)


Descriptors :   MARAGING STEELS , AUSTENITE , DUCTILITY , TOUGHNESS , QUENCHING , ELASTIC PROPERTIES , DEFORMATION , EXPERIMENTAL DATA


Distribution Statement : APPROVED FOR PUBLIC RELEASE