Abstract
Heat treatment methodology is vital to achieve high performance of advanced spring steel. The present study has investigated the microstructure and mechanical properties of the 55SiCrV spring steel processed by a novel online rapid-induction heat treatment. The results showed that rapid heating refines the prior austenite grain size of the 55SiCrV spring steel, and the vanadium mainly exists as the solid solution in the matrix instead of the dispersive precipitation of the V-containing secondary phase under the rapid induction heat treatment condition. An optimal combination of mechanical properties simultaneously with ultrahigh strength and high plasticity was obtained and the properties of the steel are mainly enhanced by the hardenability and tempering resistance of solute V in the material.
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