INVESTIGATION OF SOLIDIFICATION OF HIGH STRENGTH STEEL CASTINGS.
Interim summary rept., 9 Dec 61-8 Dec 62.
MASSACHUSETTS INST OF TECH CAMBRIDGE
Pagination or Media Count:
A furnace with related apparatus for fully controlling solidification in small samples of iron-base alloys was completed and installed. Studies were conducted using the equipment to study solidification of an iron-nickel alloy. Emphasis of the work was on effect cooling rate on details of dendrite morphology and on microsegregation in a solute-rich system. At higher cooling rates, there is a tendency for formation of primary plates filling in of interstices between primary and secondary arms during the early stages of solidification. At lower cooling rates, there is a tendency for formation of secondary plates filling in of interstices between secondary and tertiary dendrite arms. Dendrite arm spacing increases linearly with the reciprocal of the square root of the cooling rate. Secondary and tertiary arm spacings are roughly equivalent. Author