Accession Number : AD0479133


Title :   ROLE OF COBALT IN THE STRENGTHENING MECHANISMS IN THE AFC-77 STEEL.


Descriptive Note : Summary rept. 1 Feb 64-1 Feb 65,


Corporate Author : CENTRE NATIONAL DE RECHERCHES METALLURGIQUES LIEGE (BELGIUM)


Personal Author(s) : Diderrich ,E. ; Drapier ,J. M. ; Coutsouradis ,D. ; Habraken,L.


Report Date : DEC 1965


Pagination or Media Count : 39


Abstract : The hardening behavior of 13% Cr steels with Mo and Co additions is investigated in the temperature range of 400-700 C, by hardness measurements, transmission electron microscopy and electron diffraction, X-ray diffraction, and electron microprobe analysis. The effect of Co and Mo on the hardness after aging is shown. Under conditions approaching equilibrium, the presence of a Sigma type phase is demonstrated, preceded by a fine spherical precipitate uniformly dispersed in the matrix. It is assumed that cobalt is in relation with this precipitation. (Author)


Descriptors :   (*STAINLESS STEEL, HARDENING), (*COBALT, DISPERSION HARDENING), CARBIDES, INTERMETALLIC COMPOUNDS, CHROMIUM ALLOYS, MOLYBDENUM ALLOYS, MARTENSITE, QUENCHING, HARDNESS, DILATOMETERS, MEASUREMENT, MARAGING STEELS, NICKEL ALLOYS, IRON ALLOYS, ELECTRON MICROSCOPY, ELECTRON DIFFRACTION, FOILS(MATERIALS), X RAY DIFFRACTION, CHEMICAL PRECIPITATION, PROBES, MICROANALYSIS, METALLOGRAPHY, SILVER ALLOYS, ALUMINUM ALLOYS, MAGNESIUM ALLOYS, AGING(MATERIALS)


Subject Categories : PROPERTIES OF METALS AND ALLOYS


Distribution Statement : APPROVED FOR PUBLIC RELEASE