Modified austenitic heat treatment, steel with low stability in the range of 450-550 ° C, ie carbon steel and low alloy steel, to achieve good austenite deformation treatment, to use modified austenite deformation heat treatment, which The treatment process, because the plastic processing temperature range is close to the conventional quenching austenitizing temperature (about 70 ° C), is in the high temperature metastable austenite region, so it can overcome the deficiencies of _L and achieve the purpose of strengthening and toughening. However, the dynamic recovery and recrystallization during processing, as well as static recrystallization occurring in the temperature range between plastic deformation and quenching, reduce the above-mentioned excellent effects. Adapted to steel grade modified austenitizing deformation heat treatment, from hardenable carbon steel (S45C or higher carbon steel) to Ni-Cr, C: one M, Ni-C:-M. , spring steel, carbon steel may be applicable.
The martensitic transformation strengthening can be explained by the applicability and effect of the modified austenite heat treatment by spring steel. For the spring steel of the Cr-Cr system and the Cr-V system, the press-fit rate of so% to 50% in the range of 860-750 °C is quenched after plastic working, and the suitability of the modified austenite heat treatment is provided. The hardness of the quenched structure is about 2 to 3 HRC higher than that of the conventionally treated martensite, and the degree of the willow 50 can be increased corresponding to the Vickers hardness. The tempering hardness and tensile properties are the same tempering conditions in the range of 10 to 60 ° C. The modified austenite heat treatment heats the properties of the martensite to increase the hardness, and remains higher than the ordinary quenched and tempered workpiece HRCZ-3. After heat treatment of foreign metals, the temper softening resistance of steel is improved, and the yield strength and tensile strength are increased. The former increases by about 20%. The increase in yield ratio can increase the range of elastic deformation of the capital and is beneficial to the material utilization of spring steel. On the downside, the modified austenite heat treatment is used to slightly reduce the ductility. However, considering the mutual relationship between yield strength and ductility, the modified austenitic heat treatment is still superior to conventional quenching parts.
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