Abstract
Previous metallographic methods for measuring temperature distributions in cutting tools have been made by Trent and co-authors using optical microscopy. The optical method is limited to M34 high speed steel since other tool steels do not show detectable differences in optical microstructure when heated up to 350°c above the tempering temperature. The present method is based on the use of scanning electron microscopy to observe detail changes in the structure of the tempered martensite of sectioned tools at magnifications of × 16000. Temperature distributions were obtained for M2 and M42 high speed steels after controlled machining of a 0.41% carbon steel. The method has been used to determine the effect of ion plated titanium nitride and chemically deposited niobium carbide layers on lowering tool temperatures.
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