The effect of oxygen on fatigue resistance coefficient of high-grade medium-carbon steel manufactured in electric process and desulfurized with argon-refined

The experimental material consisted of semi-finished products of high-grade, medium-carbon constructional steel with: manganese, chromium, nickel, molybdenum and boron. The experimental material consisted of steel products obtained in industry metallurgical process in electric in a 140-ton basic arc furnace and desulfurized with argon-refined. The samples were quenched and austenitized at a temperature of 880oC for 30 minutes. They were then cooled in water and tempered by holding the sections at a temperature of 200, 300, 400, 500 and 600oC for 120 minutes and air-cooled. Fatigue tests were performed with the use of a rotary bending machine at a frequency of 6000 cpm. The results were statistical processed and presented in graphic form. This paper discusses the results of oxygen content in steel on the fatigue strength characteristics of the average number of sample-damaging cycles and the average values of the fatigue resistance coefficient for various heat processing options.