Accession Number : AD0258142

Title :   INVESTIGATION OF SHELL MOLDING SURFACE DEFECTS

Corporate Author : WATERVLIET ARSENAL N Y

Personal Author(s) : SLAWSKY,M.L. ; HEISER,F.A. ; BRAMFITT,B.L.

Report Date : DEC 1960

Pagination or Media Count : 1

Abstract : The sheel casting surface defect, commonly called the 1020 defect from its incidence in low carbon, low alloy steels, has been shown to be a pinholetype defect. Its occurrence in low carbon, low alloy, steel castings has been investigated and the effects of various factors, molding and metallurgical, have been determined. Based upon the results, techniques have been established to eliminate the occurrence of the defect. It is shown that deoxidation with calcium-silicon-manganese, rather than with aluminum, and control of pouring temperature will effectively control the pinholing. Alternatively, the use of additives which cause a faster solidification rate of the casting is beneficial. The techniques developed are applied to several components. (Author)

Descriptors :   *CASTINGS, *MOLDINGS, *STEEL, ADDITIVES, ALLOYS, CALCITE, CALCIUM, CARBON, CASTING, HARDENING, MANGANESE, OXIDATION, PLASTICS, SILICATES, SILICON, SURFACE PROPERTIES, SURFACES, TEMPERATURE, ZIRCONIUM COMPOUNDS

Distribution Statement : APPROVED FOR PUBLIC RELEASE