The forging factory adopts unconventional heat treatment technology, overcomes the internal and external microstructure transition, reduces the thermal stress and the organization stress, so the effect is obvious, the following methods play an important role in the process of heat treatment, and also save a lot of energy, it is worth advocating and popularizing. 1, surface hardening (induction heating, flame heating, electrolytic heating quenching, etc.).
For example, screw, screw, spindle and other slender parts using surface hardening can not only ensure that the surface has enough hardness, high wear resistance and fatigue strength, at the same time with good strength and toughness, parts of the overall deformation of small.
2, forging deformation heat treatment.
3. Controllable atmosphere and vacuum heat treatment. 4, forging plant chemical heat treatment.
For the forging of nitriding, soft nitriding, the internal and external tissues of the chemical composition of the difference, at the same time the temperature is below the phase change point, so as to avoid the whole quenching after the deformation of the possibility of a significant increase, applicable to the deformation of the strict requirements of forgings. 5. Ultrasonic quenching.
The use of ultrasonic energy to make the quenching medium vibration, can eliminate the quenching of the surface of the steam membrane, so that the cooling speed increase, so that the quenching process increased intensity, cooling more evenly, can avoid the forging surface to produce soft points, soft zone, the internal stress and deformation is significantly reduced. 6. Fast heating. is used to increase the temperature of heating, so that the surface of the forgings quickly reach the quenching temperature, and then complete the quenching heat treatment process, such as gear in the salt bath furnace rotation heating teeth or high-frequency heating, due to the short heating time, the surface of the austenite grain did not grow, quenching the surface heat can not be passed to the interior, Therefore, only the surface of the organization changes, deformation significantly reduced.