EFFECT OF TEMPERING TEMPERATURE ON MICROSTRUCTURE AND PROPERTIES OF HIGH NITROGEN STAINLESS STEEL SKATES

The results show that when the tempering temperature is 180 similar to 550 degrees C, the hardness, tensile strength and yield strength decrease first, then increase and then decrease rapidly. The test steel reduces carbon and increases nitrogen, and there is no coarse eutectic carbide in the structure. When the tempering temperature is 500 degrees C, the matrix structure is tempered sorbite, carbide M23C6 and nitride Cr2N are finely dispersed and evenly distributed on the matrix. Secondary hardening occurs when tempering at 500 degrees C, and the strength and hardness reach the peak, which is related to the dispersion strengthening of carbonitride. The experimental results provide theoretical guidance for high carbon steel in the process of making skates.