经过淬火硬化的钢,其最终机械性能取决于回火。在回火过程中,发生组织转变,随着回火温度的升高,硬度和强度下降,而塑性和韧性则逐渐增加。与此同时,淬火应力也逐渐松弛、减小或消除,可保持机械零件在服役过程中尺寸的稳定。因此,通常的回火规程,不仅规定严格的回火温度,而且要求相当长的回火保温时间。一般由几十分钟到十几小时。长时间保温,造成热能消耗多,生产效率低。快速感应回火可以大幅度缩短加热和保温时间,是热处理节能的有效途径。它不仅有很大的经济价值,而且也具有理论上的意义。 After quench hardened steel, the final mechanical properties depend on the tempering. In the tempering process, the organization changes occur, with the tempering temperature increases, the hardness and strength decreased, while the ductility and ductility increased gradually. At the same time, the quenching stress is also gradually relaxed, reduced or eliminated, to keep the mechanical parts in service in the process of dimensional stability. Therefore, the usual tempering procedure not only stipulates a strict tempering temperature, but also requires a rather long tempering holding time. Generally by a few dozen minutes to ten hours. Insulation for a long time, resulting in heat consumption, low production efficiency. Rapid induction tempering can greatly reduce the heating and holding time, heat treatment is an effective way to save energy. It not only has great economic value, but also has theoretical significance.