Accession Number : AD0730535

Title :   Embrittlement in Low-Carbon Steels Due to Manganese,

Corporate Author : DEFENCE STANDARDS LABS MARIBYRNONG (AUSTRALIA)

Personal Author(s) : DE Morton,M. E.

Report Date : 18 MAY 1971

Pagination or Media Count : 4

Abstract : The addition of manganese to mild steel increases the toughness by grain refinement and by a change in the pearlite morphology from a lamellar to granular carbide form. In low-carbon steels manganese adsorbs to varying degrees at the cementite-austenite-ferrite interfaces and effectively increases the cementite-ferrite interfacial energy; this prevents spreading of the cementite along grain boundaries and thereby reduces the tendency for the formation of degenerate pearlite and carbide films which are known to crack readily during deformation and initiate unstable fracture in the matrix. The present work shows, however, that the resulting higher particle-matrix interfacial energy can produce its own problems in that cracking at particle-matrix interfaces occurs more readily during deformation and can induce embrittlement when large volume fractions of carbide phase are present. (Author)

Descriptors :   (*STEEL, EMBRITTLEMENT), MANGANESE ALLOYS, CARBON ALLOYS

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE