Abstract
Induction surface hardening is a quite traditional and well-known process in which a metal part is induction-heated and then quenched. The quenched metal undergoes a martensitic transformation, increasing the hardness and stiffness of the part. The design of a surface hardening system is a challenging task. This paper describes an approach to divide a full problem into simpler ones and to optimize the electrical regime. We compare the effectiveness of using a single-objective rather than a multi-objective optimization approach.
Highlights
The design of induction hardening systems involves defining both the electrical regime and geometry of the induction coil
This paper describes an approach to divide a full problem into simpler ones and to optimize the electrical regime
The use of numerical simulations has been a key element in designing induction systems
Summary
The design of induction hardening systems involves defining both the electrical regime and geometry of the induction coil. This implies a considerable number of degrees of freedom, which must be set in order to reach a given goal. Starting from a complex geometry work-piece, we determinate the heating time, frequency, and current that optimally provide the desired hardening depth. From the temperature history of each node of the mesh, making use of [12], the final distribution of martensite has been calculated In this model, the content of martensite in one point is dependent on three aspects: whether the AC3 temperature has been reached or not, the average cooling rate, and the temperature after the quenching phase.
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