Effect of Casting Conditions on the Unidirectional Solidification of Superalloys

19850973
Journal: Fifth World Confrence on Investment Casting, Paper No. 8, Florence, Italy, 1980.
Author: Northwood, J.E.; Winstone, M.R.; Homewood, T.

Report pertains to superalloys IN713LC and Mar M246 (both high nickel alloys) and covers effects of solidification conditions on their creep rupture properties. Solidification conditions, such as the temperature gradient and cooling rate, can produce various structures. In general, the finer the dendritic structure the stronger the alloy. Paper discusses tests in which several different casting techniques wre used to develop a range of microstructures and dendrite morphologies. It is shown that the creep rupture properties are degraded when the secondary dendrites are branched due to poor temperature gradient or too high a solidification growth rate.