FIELD: mechanical engineering. SUBSTANCE: surface of part to be hardened is heated by high-speed sliding friction and is cooled by lubricant-and-coolant delivered to zone of treatment. Cooling is effected at rate of 3•104-2,2•105 K/s by feeding the lubricant-and-coolant at angle of 40 to 50 deg at utilization factor of 0.5 to 0.7. EFFECT: increased thickness of white layer. 3 dwg, 1 ex
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