Abstract
Gradient solidification and differential thermal analysis (DTA) experiments were used to study the process of solidification and the solidification microstructure of 11 alloys comprising the composition range of customary commercial high-speed steels (with the exception of cobalt-alloyed grades). Also included are a number of experimental high-speed steels alloyed with niobium. The results include the effects of alloy composition and cooling rate on the width of the solidification interval and on the sequence of the solidification reactions; the types of eutectics formed (austenite with M6C, M2C, or MC) and their volume fractions; the chemical compositions of the ledeburitic and primary carbides; and the relation between the chemistry of the carbides and that of the melt. Special attention is given to the formation and composition of heterogeneously nucleated primary MC particles and to the chemistry and stability of eutectic M2C, which is important as a precursor to MC and M6C in the microstructure of finished (hot-worked and heat-treated) material.
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Fischmeister, H.F., Riedl, R. & Karagöz, S. Solidification of high-speed tool steels. Metall Trans A 20, 2133–2148 (1989). https://doi.org/10.1007/BF02650299
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DOI: https://doi.org/10.1007/BF02650299