Abstract
The metallographic changes taking place in four M grade steels, M3/2, Px30 (a Powdrex SA water atomised powder equivalent to ASP 30), M2, and M42, during sintering at the optimum temperature and oversintering in vacuum and in a nitrogen based industrial atmosphere have been investigated using SEM and EDS techniques. M6C and MC primary carbides were observed after vacuum sintering and MX carbonitrides instead of MC carbides were found in the specimens sintered in the industrial atmosphere. Small amounts of a eutectic carbide rich in Cr and Fe were observed at the optimum sintering temperature. On oversintering in vacuum different types of eutectic carbides were observed MC, needle shape, and M6C but MC type eutectic carbides were not observed on oversintering the samples in the industrial atmosphere. PM/0535
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