3. Unit 2: Speeds, Feeds, and Tapping - tool speed
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MAZUR, J. Structure of Tempered Martensite. Nature 164, 230–231 (1949). https://doi.org/10.1038/164230a0
INVESTIGATIONS are being carried out on tempered martensite in samples which have been previously subjected to very low temperature treatment. Two plain carbon steels were chosen containing 0·89 per cent and 1·2 per cent carbon respectively.

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