Accession Number : AD0742657

Title :   Investigation of Solidification of High Strength Steel.

Descriptive Note : Interim rept. 1 Jan-31 Dec 70,

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

Personal Author(s) : Gnanamuthu,D. S. ; Basaran,M. ; Kattamis,T. Z. ; Mehrabian,R. ; Flemings,M. C.

Report Date : JAN 1972

Pagination or Media Count : 86

Abstract : The effects of high temperature homogenization on sulfide inclusions were studied in unidirectionally solidified low alloy steel ingots containing Type II, Type III, and a mixed Type II-III sulfide inclusions. Specimens were taken at various distances from the chill and were heat-treated at 1315C (2400F) in vacuum and homogenized for various times between 20 and 100 hrs. Type II and mixed Type II-III sulfide inclusions coalesced to compact polyhedral shapes during homogenization. These more compact shpaes should be much less deleterious to mechanical properties than the original Type II and II-III inclusions. Microporosity was studied in unidrectionally solidified low alloy steel using X-ray microradiography and optical metallography. (Author)

Descriptors :   (*STEEL, FREEZING), DEFECTS(MATERIALS), CASTINGS, POROSITY, SULFIDES, OXIDES, SCATTERING

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE