PHASE CHANGES DURING STEP HARDENING OF HIGH-SPEED STEELS
Keywords:
high-speed steels, heat treatment, stepped hardening, holding, red hardness, dispersion carbide, heating, modes, retained austeniteAbstract
The scientific work shows the effect of temperature and holding time on the percentage of retained austenite, as well as how stepped hardening affects the properties of high-speed steel products. In practice, in many industrial enterprises, the methods of high-step hardening of high-speed steels are carried out at T = 600-675 °C. n this scientific article, specimens with a diameter of 15 and a length of 16 mm made of R6M5K4 high-speed steel were studied. After successive tempering and hardening processes, the phase composition and microstructural components were studied, the hardness was measured by the Rockwell method, and the red hardness was tested with increasing temperatures of 610, 630 and 650 °C with holding times of 4 hours.
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