Accession Number : AD0700591

Title :   STUDY OF STATIC AND FATIGUE PROPERTIES OF AN AIRCRAFT CASTING (18% Ni MARAGING STEEL),

Corporate Author : MINISTRY OF TECHNOLOGY LONDON (ENGLAND) MATERIALS DIV

Personal Author(s) : Singh,B.

Report Date : 1967

Pagination or Media Count : 53

Abstract : Tests on aircraft wing root end fittings with integrally cast clover leaf test bars made in 18% Ni maraging steel by the ceramic shell moulds process have demonstrated that it is practicable to produce castings with asymmetric casting geometry having tensile strength of 110-115 tonf/sqin with adequate ductility and impact resistance. Both the static mechanical properties and fatigue strength are marginally influenced by the cooling rate during solidification. Whilst the static strength for the steel castings in 18% Ni maraging steel can be increased for 80 tonf/sqin T.S. to 100+ tonf/sqin T.S., the fatigue strength is reduced, following the reduction previously noted with 80 tonf/sqin T.S. steel as compared with 64 tonf/sqin T.S. steel. However, where the maximum fatigue strength is not the predominant criterion, the designer can usefully take advantage of the increase of 20+ tonf/sqin T.S. with adequate ductility. (Author)

Descriptors :   (*MARAGING STEELS, *AIRFRAMES), CASTINGS, FATIGUE(MECHANICS), STATICS, HEAT TREATMENT, CASTING, MECHANICAL PROPERTIES, GREAT BRITAIN

Subject Categories : Aircraft
      Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE