Accession Number : AD0715940

Title :   Behavior of Silica Inclusions During Solidification of an Iron Base Alloy.

Descriptive Note : Final rept. Jan 69-Jan 70,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF METALLURGY AND MATERIALS SCIENCE

Personal Author(s) : Myers,M. ; Flemings,M. C.

Report Date : SEP 1970

Pagination or Media Count : 185

Abstract : Results are presented of an experimental program designed to study the behavior of inclusions during dendrite growth and the nature of the interactions between the inclusions and the dendrites. The base alloy employed was Fe-50% Cu, chosen because of its very wide freezing range (336C). One series of experiments involved 'isothermal' holding of a previously solidified alloy at a temperature within the liquid plus solid region. The alloy contained approximately .25 volume percent silica inclusions. A series of continuous cooling (continuous solidification) experiments were conducted at cooling rates from 19C/sec to .3C sec. Decreasing cooling rate (increasing local solidification time) altered inclusions in qualitatively the same way as did increased isothermal holding time.

Descriptors :   (*IRON ALLOYS, IMPURITIES), (*SILICON DIOXIDE, IRON ALLOYS), FREEZING, CASTINGS, DENDRITIC STRUCTURE, MATHEMATICAL MODELS, INTERACTIONS

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE