The third generation of advanced high strength steels represents a promising approach to meet the requirements of the automotive industry. A profound knowledge of the mechanical performance and the possible limitations of the different steel grades is necessary to achieve the best properties for a given application. In the present work, the main differences between transformation-induced plasticity (TRIP)-aided bainitic ferrite (TBF) and quenching and partitioning (Q&P) heat treatments was studied on the same low C steel. The mechanical properties obtained from tensile testing were correlated to the microstructure, which was investigated by scanning electron microscopy and dilatometry. In a first step, the influence of varying process parameters was evaluated. The results revealed that both heat treatment concepts offer an interesting combination of strength and ductility. While TBF heat treated samples achieved higher uniform elongation, superior reduction of area was gained by Q&P cycles, which is assumed to be beneficial for local formability.

第三代高级高强度钢代表了一种有前途的方法，可以满足汽车行业的要求。对于给定的应用，要获得最佳性能，必须对机械性能以及不同钢种可能存在的局限性有深刻的了解。在目前的工作中，研究了在相同的低碳钢上进行相变诱导塑性（TRIP）辅助的贝氏体铁素体（TBF）与淬火和分配（Q＆P）热处理之间的主要区别。从拉伸试验获得的机械性能与微观结构相关，通过扫描电子显微镜和膨胀法对其进行了研究。第一步，评估了各种工艺参数的影响。结果表明，两种热处理概念都将强度和延展性进行了有趣的结合。尽管经过TBF热处理的样品具有较高的均匀伸长率，但通过Q＆P循环获得了面积的显着减小，这被认为有利于局部可成形性。