Abstract
We study the fatigue life of springs made of manganese steel (0.66% С and 1.02% Mn) after four modes of heat treatment leading to the formation of troostite, martensitic–bainitic, and bainitic–martensitic structures. Springs are studied under the conditions of strain-controlled cyclic loading similar to the operating conditions of products intended for special applications. It is shown that the optimal durability of springs is guaranteed by the mixed structure of lower bainite and martensite obtained after isothermal quenching and special tempering performed by interrupting the process of cooling after quenching in the interval between the points corresponding to the onset and end of the martensitic transformation. The durability of springs is connected with the quantitative parameters of phase composition and dislocation structure and with the micromechanism of fracture of spring steels.
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