Accession Number : AD0710342

Title :   INVESTIGATION OF SOLIDIFICATION OF HIGH STRENGTH STEEL CASTINGS UNDER SIMULATED PRODUCTION CONDITIONS.

Descriptive Note : Final rept.

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DIV OF SPONSORED RESEARCH

Report Date : 01 JUL 1958

Pagination or Media Count : 59

Abstract : Plate castings of a modified 4330 alloy were cast in a variety of different molding materials to obtain widely varying solidification conditions. Cooling rates during solidification (at test bar locations) were varied from 300F per minute to less than 20F per minute. Thermal gradients during solidification were varied from 350F per inch to less than 70F per inch. Mechanical properties, including tensile and impact properties were measured in various locations in the plates solidified under different thermal conditions. Properties were measured in the quenched and tempered condition. Tensile and yield strengths were essentially constant in all plates, but large variations in elongation and reduction of area properties were obtained depending on solidification conditions. These differences were attributed to differences in (1) microporosity, (2) microsegregation, and (3) inclusion size and distribution. (Author)

Descriptors :   (*STEEL, *CASTINGS), FREEZING, CASTING, MECHANICAL PROPERTIES, GRAIN STRUCTURES(METALLURGY), POROSITY, IMPURITIES, DEFECTS(MATERIALS)

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE