The forging factory adopts unconventional heat treatment process, overcomes the internal and external organization transformation of forgings, reduces the thermal stress and tissue stress, so the effect is more obvious, the following methods play an important role in the process of heat treatment, and also save a lot of energy, which is worth advocating and popularizing.
1, Surface quenching (induction heating, flame heating, electrolytic heating quenching, etc.). For example, screw, screw, spindle and other slender parts using surface quenching can not only ensure that the surface has enough hardness, high wear resistance and fatigue strength, at the same time, the interior has good strength and toughness, the overall deformation of the parts small.
2, forging deformation heat treatment.
3. Controllable atmosphere and vacuum heat treatment.
4. Chemical heat treatment of forgings. For the forging of nitriding, soft nitriding, the internal and external tissues of the chemical composition of the difference, at the same time its temperature under the phase change point, so as to avoid the overall quenching deformation significantly increased after the possibility, suitable for deformation requirements of the strict forging.
5. Ultrasonic quenching. Using ultrasonic energy to produce vibration of quenching medium can eliminate the steam film on the surface of quenching forgings, increase the cooling speed, increase the intensity of quenching process, more evenly cooling, avoid the soft spot and soft belt on the forging surface, and reduce the internal stress and deformation obviously.
6. Rapid heating. Refers to the use of improved heating temperature, so that the surface of the forging quickly reached the quenching temperature, and then completed the quenching heat treatment process, for example, the gear in the salt bath furnace to rotate the heating gear or high-frequency heating, and so on, because the heating time is short, the surface of austenite grains did not grow, after quenching the surface of the heat can not be transferred to the interior, so only the surface has an organizational transformation, deformation significantly reduced.