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THE INFLUENCE OF MOLYBDENUM AND VANADIUM ON THE PROPERTIES OF THE NITRIDE COATING OF POWDERY, TUNGSTEN-FREE, FAST-CUTTING STELLS

Annotation

The article studies the influence of molybdenum and vanadium on the most important properties of nitride coating - hardness and heat stability. A molybdenum-content increase of more than 3% leads to an increase in the hardness and heat stability of nitrided steels. A vanadium-content increase of more than 3% raises the hardness and heat stability of nitride coating. However, when the temperature is higher than 620C this distinction is insignificant. The composition of slightly-alloyed, tungsten-free, powdery steel POM2ФР-МП is optimal and economically justified for nitriding. The cutting properties of this steel are 1.3 times as high as those of the most wide-spread cast, fast-cutting steel P6M5 in milling the steel 45 (HB 197 … 207). Nitriding (duration: 1.5 hours, degree of dissociation: 25 - 35 %) results in a 2 - 2.5-time stability increase of steel РОМ2Ф3-МП plates and a 1.5 - 1.8-time stability increase of steel P6M5 plates.

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UDC

УДК 621.785.532

Pages

364-367

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