The P-N curve of the induction hardening diagram MoAL; the curve is in actual production; we found that under the condition of ensuring the depth of a certain hardened layer, the hardness of the surface layer and the favorable residual compressive stress, the contribution of the distribution to the fatigue strength is much greater than The effect of the increase in core hardness on the fatigue strength of the gear. The bending fatigue curve of 50CrMoA is a powerful proof. The test gear hardened layer is 24mm deep, the core hardness is HB280-290, and the surface hardness is HRC56. Compared with the 42CrMo steel gear with two core hardnesses, the bending fatigue strength is slightly higher, and it is greatly improved after shot peening.
The fatigue strength of the tooth surface is proportional to the square of the gear hardness. Therefore, under the premise of ensuring the plasticity and toughness of the gear, proper selection and development of some steels with high carbon content will undoubtedly improve the bearing of large heavy-duty intermediate frequency hardened gears. The ability has a beneficial impact. Low hardenability steels have been widely used in the manufacture of large heavy duty gears in recent years.
The low carbon steel has a carbon content of 7. The surface hardness after quenching can reach HRC65, and the hardness gradient is stable, the price is low, no quenching and tempering is required, and the deformation is small. Compared with carburizing, the energy is saved by 50 or more. A factory uses 60DTi instead of the original 42CrMo. Quenched and tempered steel or 20CrMnMo carburized steel, gear with modulus 712, achieved satisfactory results and achieved significant economic benefits. However, its hardenability is often difficult to control, and the range of chemical composition fluctuations is wide, which cannot guarantee the quality stability in mass production.
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