Carburized bearing steel is a high quality low carbon or medium carbon alloy steel. After carburizing, the surface has high hardness, wear resistance and high fatigue strength and dimensional stability. At the same time, the core of the bearing material also requires high toughness and certain resistance. Thermal performance for the manufacture of bearings bearing large impact loads, such as rolling mills, heavy vehicles, and locomotive bearings. The author uses low carbon CrNiMo carburized bearing steel as test material, analyzes the nucleation, size and growth state of the crystal during hot compression, derives the deformation activation energy, and establishes the flow stress constitutive equation and thermal processing diagram. The critical static recrystallization time of the compression sample was tested to provide theoretical basis and experimental basis for the hot forming of low carbon CrNiMo carburized bearing steel.
In order to explore the hot compression recrystallization behavior of low carbon CrNiMo carburized bearing steel, the scholars of Kunming University of Science and Technology used the Gleeble 1500D thermal simulator to test the isothermal thermal compression test of the test steel. The deformation temperature was 900~1050 °C and the deformation rate was 0.1, 1, 10s-1, the deformation amount is 10%, 30%, 50%. The dynamic re-crystallization process of material thermal deformation was analyzed by the true stress-true strain curve and grain size change under different deformation conditions. The deformation activation energy and flow stress constitutive equation of the material were linearly regressed, and the material heat was drawn. The process map was processed and the critical time of hot pressing static recrystallization was tested. The results show that high deformation temperature, low strain rate and large deformation are beneficial to the dynamic recrystallization of the material. The test steel is finely recrystallized at a temperature of 1050 ° C, a deformation of 50% and a deformation rate of 1 s-1. The average grain size of the grain is 14.97μm; the deformation activation energy of the low carbon CrNiMo carburized bearing steel is slower than 30%, and the activation energy of 50% deformation is 436.016kJ/mol. The hot working process diagram and test results Consistent; 900 ° C, 1 s-1, 50% deformation, the material reached the dynamic recrystallization thermodynamic conditions, thermal recrystallization, static recrystallization time 5min.
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