Abstract
1. The tempering temperature ensuring maximum resistance to fatigue of quenched 55KhGR spring steel is 520–560°C. 2. High-temperature thermomechanical treatment (50% swaging) increases the resistance to fatigue by not less than 10% and the durability almost 9 times. 3. The optimum temperature of 55KhGR steel after hightemperature thermomechanical treatment is 250–300°C. The effect of high-temperature thermomechanical treatment is eliminated when the tempering temperature is above 400°C. 4. In steel subjected to high-temperature thermomechanical treatment the variation of the fatigue limit with the tempering temperature is different in the quenched steel. 5. High-temperature thermomechanical treatment in which the degree of swaging is low (15–25%) is the most effective in increasing the resistance of the steel to fatigue when the tempering temperature is 250°C.
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