Abstract
Three types of eutectic carbides, M2C, M6C and MC, were revealed in the as cast microstructure of the AISI M2 type high-speed steel inoculated with different additions to the melt. The thermal stability of these carbides were analysed in the range of austenitising temperature from 1180°C up to 1260°C. It was found that the M6C and MC eutectic carbides were stable up to 1240°C and 1260°C, respectively. The M2C carbide started to decompose at substantially lower austenitising temperature and its thermal stability was shown to depend on both the morphology and the chemical composition, and the origin of the inoculating additions used before casting.
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