Abstract
The relationship between workpiece microstructure and tool wear in metal cutting is discussed. It is suggested that minor amounts of oxygen-bearing inclusions, intrinsic to steels, may have major effects on machinability through their ability to promote abrasive wear; recent results are cited to validate this proposal. Using the empirical relationships developed by Khruschov between the relative hardness of the abrading/abraded surfaces and the wear rate, the principles of inclusion chemistry control for enhanced machinability are advanced. A thermodynamic analysis of steel-making reactions is cited to indicate the methodology required for implementation of these concepts. To verify the theory, data from laboratory studies on carbon steels containing modified inclusions are presented.
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