Hot-stamped parts in a fully martensitic state exhibit very low ductility levels prior to failure, which limits their use in certain components. In the case of B-pillars, which may undergo impact loading, it could be desirable to create part zones with softer and more ductile microstructures. Local softening by means of an induction heating system is one of the methods of tailoring the properties for increasing overall energy absorption while minimizing additional manufacturing facilities. Through selective heating of the hardened zone, it is possible to form zones with very high strength and regions of reduced strength but increased ductility, resulting in a part with tailored mechanical properties. As local softening by induction heating is affected by thermomechanical properties, thermal deformation due to local heating is inevitably induced. Therefore, in this study, a local induction heating system combined with a deformation control unit is developed to minimize thermal deformation induced by local softening. The effectiveness of the system performance is strongly confirmed by the on-line application in the production line, and part qualities are significantly improved.

处于完全马氏体状态的热冲压零件在失效前表现出非常低的延展性水平，这限制了它们在某些部件中的使用。对于可能承受冲击载荷的 B 柱，可能需要创建具有更柔软和更具延展性的微观结构的部件区域。通过感应加热系统进行局部软化是定制特性以增加整体能量吸收同时最小化额外制造设施的方法之一。通过对硬化区进行选择性加热，可以形成强度非常高的区域和强度降低但延展性增加的区域，从而产生具有定制机械性能的零件。由于感应加热引起的局部软化受热机械性能的影响，因此不可避免地会引起局部加热引起的热变形。因此，在本研究中，开发了一种结合变形控制单元的局部感应加热系统，以最大限度地减少由局部软化引起的热变形。该系统性能的有效性在生产线的在线应用中得到了有力的证实，零件质量得到显着提高。