Accession Number : AD0437596


Title :   GUIDING PRINCIPLES FOR LOWERING THE DUCTILE-TOBRITTLE TRANSITION TEMPERATURE IN THE BODYCENTERED-CUBIC METALS,


Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF


Personal Author(s) : Conrad,Hans


Report Date : 10 Dec 1963


Pagination or Media Count : 30


Abstract : Yielding, flow, and fracture of body-centeredcubic (b.c.c.) metals are briefly reviewed to ascertain the guiding principles for lowering the ductile-to-brittle transition temperature, T sub c. It is concluded that the major methods for lowering T sub c in polycrystals are: (1) ultra-high purification, (2) use of scavengers to remove interstitials, (3) prestraining, (4) decreasing the grain size, and (5) introducing a dispersion of hard second-phase particles. Experimental and theoretical support exists for each of these methods. The roles of twinning and alloying have not as yet been resolved. (Author)


Descriptors :   TRANSITION TEMPERATURE , DUCTILITY , BRITTLENESS , TRANSITION METALS , CRYSTAL DEFECTS , TUNGSTEN , STEEL , GRAIN STRUCTURES(METALLURGY) , MOLYBDENUM , IRON , DEFORMATION , HIGH TEMPERATURE , SCIENTIFIC RESEARCH , ELECTRON MICROSCOPY


Distribution Statement : APPROVED FOR PUBLIC RELEASE