Abstract
1. Ultrasonic treatment of Kh16N11M3 steel leads to strengthening of it, as revealed in an increase in microhardness. There is an optimum emission time at which the microhardness is a maximum. 2. A time of emission exceeding the optimum leads to a drop in microhardness. This fact and also structural investigations made make it possible to assume that long ultrasonic emission causes loss of strength similarly to the effect of dynamic recovery. 3. Combined ultrasonic and cyclic heat treatments (ultrasonic + cyclic heat, cyclic heat + ultrasonic) increase the yield point of Kh16N11M3 steel but decrease its tensile strength. 4. Combined ultrasonic and cyclic heat treatments may be useful for obtaining specified service properties of austenitic steels.
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