Abstract
The as-casr microstructure of HK heat resistant steel produced by the investment casting process has been investigated. The pouring temperature and cooling method effects on the austenite grain size and shape, segregation of alloying elements and formation of eutectic carbides have been evaluated herein. Microscopic studies have shown tliat the microstructure of the steel consists of dendritic austenite with carbides in the grain boundaries and dendritic arm spaces. Decreasing the pouring temperature converts large columnar grains to small equiaxed grains and prevents the large eutectic carbides in the grain and dendritic boundaries. Also, increasing the cooling rate can decrease the formation of grain boundary carbides.
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