Abstract
The microstructure, growth morphology and crystallographic characteristic of the primary (Fe, Cr)7C3 carbide in hypereutectic Fe-Cr-C alloy are investigated. The primary (Fe, Cr)7C3 carbide is irregular polygonal shape with several hollows in the center and gaps on the edge. In the initial growth stage, the crystallographic orientations of neighboring (Fe, Cr)7C3 carbides are the same and some protrusions are emerged. The primary (Fe, Cr)7C3 carbide consists of several parts, which are divided by the low-angle boundaries. Analysis suggests that the primary (Fe, Cr)7C3 carbide exhibits agglomeration phenomenon which results in the low-angle boundary, as well as the hollows and gaps.
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