The solidification structure of rapidly quenched commercial high speed tool steels has been studied by means of two-piston splat-quenching and argon-arc plasma-spraying. X-ray studies of the as-quenched structure reveals an increase in austenite retention and almost complete suppression of carbide formation. After tempering, splat-quenched and plasma-sprayed specimens show a hardening peak at higher temperatures and higher hardness than the same steels heat-treated conventionally. X-ray diffraction work reveals that on tempering, austenite transforms to a bcc phase, with the austenite disappearing by 700°C, and no detectable carbide precipitation.
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