Tempering is a heat treatment process in which the workpiece is heated to a temperature below AC1 after quenching, kept warm for a certain period of time, and then cooled to room temperature. The purpose is to eliminate the residual stress generated during quenching of the workpiece, prevent deformation and cracking, and adjust the hardness and Strength, plasticity and toughness meet the performance requirements. Therefore, tempering is an important heat treatment process. There are many ways of tempering. Today, the editor will analyze for you the advantages of using ultrasonic induction heating equipment for induction tempering heat treatment of workpieces compared with other temperings.
The workpiece is usually subjected to low-temperature tempering after induction quenching. The purpose is to reduce the residual internal stress, reduce the brittleness of the quenched steel, improve the toughness and increase the dimensional stability while the hardness remains basically unchanged. In production, furnace tempering, self-tempering (that is, short-time tempering achieved by using the residual heat of the inner layer of the quenching zone after cooling by induction quenching to raise the surface temperature of the workpiece to a certain value) and induction heating tempering can be performed respectively.
The tempering temperature in the furnace is usually 150-180℃ and the holding time is 1-2h.
The characteristics of self-tempering are that it can save energy, simplify the process, and prevent cracking of high carbon steel and high alloy steel during quenching. However, the process is not easy to master, and the stress relief effect is not as good as that of furnace tempering.
Induction heating and tempering can be performed continuously through the tempering inductor immediately after induction quenching. In order to reduce the residual tensile stress in the transition layer of the quenched part, the tempering induction heating layer should be deeper than the quenching layer to achieve the purpose of tempering. Induction heating tempering should use a very low current frequency or a very small specific power, extend the tempering heating time, and use heat conduction to thicken the tempering heating layer. When using ultrasonic induction heating equipment for simultaneous heating, the intermittent heating method can be used to increase the depth of the heating layer. The most important feature of the induction heating tempering method is that the tempering time is short. To achieve the same hardness and other performance indicators, the tempering temperature is higher. Experiments show that induction heating tempering, due to the short heating time, has higher wear resistance and greater impact toughness than furnace tempering.
In summary, induction tempering heat treatment of workpieces has great advantages. As for the specific method of tempering and heat treatment, you can read more books on heat treatment. I believe you will gain a lot.
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