Accession Number : AD0654769

Title :   SOLIDIFICATION OF IRON BASE ALLOYS AT LARGE DEGREES OF UNDERCOOLING.

Descriptive Note : Interim rept. 1 Oct 65-30 Sep 66,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF METALLURGY

Personal Author(s) : Kattamis ,T. Z. ; Flemings,M. C.

Report Date : 30 SEP 1966

Pagination or Media Count : 80

Abstract : Dendrite morphology and grain size were studied in bulk samples of iron and nickel base alloys undercooled up to 300 C. In the alloys studied, dendrite morphology gradually changes with increasing undercooling from the usual dendritic structure to a structure composed of cylindrical dendrite arms. At a critical undercooling of approximately 170 C in these alloys there is an abrupt transition to a fine grained structure of spherical morphology.

Descriptors :   (*IRON ALLOYS, FREEZING), (*STEEL, FREEZING), (*SUPERCOOLING, IRON ALLOYS), CASTINGS, CRYSTALLIZATION, EUTECTICS, MICROSTRUCTURE, DENDRITIC STRUCTURE, NICKEL ALLOYS, COBALT ALLOYS, TIN ALLOYS

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE