The effect of Heat and Chemical-Heat Treatment on the Tribological Properties of Hard Alloys T14K8 and T15K6

Abstract

Carbonitriding in a bath (medium composition: potassium cyanate KCNO - 85 - 90% K2CO3 potassium - 10 to 15%) is carried out at a temperature of 560°C during 30 min with subsequent cooling in air. Heat treatment procedure included: preheating to a temperature of 100 - 150°C (3 min), heating in a salt bath at 850°C (3 min), and final heating at a temperature of 1150°C (3 min). The dependence of hardness, diamond abrasive wear, and wear resistance ofT14K8 and T15K6 on conditions of heat and chemical-heat treatment is studied. The hardness of the samples is measured using a TH 301 device. Tensile strength of the alloy before and after heat treatment in the salt melt and carbonitriding is determined on a tensile electromechanical machine TS 5047-50. Determination of the abrasive wear (then used for assessing the effect of treatment on the wear rate and friction coefficient) is carried out using a diamond cup wheel 150 x 20 x 5 7/5 ACM V2-01 (GOST 16172-90). The microstructure is studied using a multivision set μVizo-MET-221 and Jeol-6000 electron microscope (NeoScope). The phase composition is determined using a MD-10microdiffrantometer.