New concepts proposed for processing of dual phase (DP) steels as one of the main classes of advanced high-strength steels (AHSSs) to enhance their mechanical properties (strength–ductility combination) and corrosion resistance were introduced. The current review covers (I) the processing routes to obtain the ferritic–martensitic microstructures, (II) parameters of intercritical annealing (IA) treatment, (III) primary thermomechanical treatments, and (IV) post processing. First, the principal heat treatment methods, i.e., step quenching, intermediate quenching, and intercritical annealing of ferritic–pearlitic steel, as well as the partitioning of manganese were critically discussed. Then, the effects of holding time at the intercritical annealing temperature on the austenitization, grain coarsening kinetics, abnormal grain growth, and volume fraction of martensite were summarized. Next, the importance of cold deformation (notably rolling) and heating rate for the development of fine-grained DP microstructures (with chain-networked martensitic islands) through recrystallization and modification of the preferred nucleation sites for the austenite phase was discussed. Moreover, the applications of severe plastic deformation techniques (such as constrained groove pressing), thermal cycling (multi-step or repetitive intercritical annealing), and spheroidization heat treatment were discussed. Finally, the impacts of tempering, quench aging, and bake hardening on the properties of DP steel were reviewed. This short overview shows the opportunities that the conventional and innovative processing routes can offer for the potential industrial applications of DP steels, especially in the lightweight car body for the automotive industry to address the safety, fuel consumption, and air pollution issues.

中文翻译：

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双相钢的机械和腐蚀性能的最新研究进展

提出了将双相（DP）钢加工为先进的高强度钢（AHSS）的主要类别之一的新概念，以增强其机械性能（强度-延展性）和耐腐蚀性。本篇综述涵盖了（I）获得铁素体-马氏体显微组织的工艺路线，（II）临界退火（IA）处理的参数，（III）初级热机械处理，以及（IV）后处理。首先，主要讨论了主要的热处理方法，即铁素体-珠光体钢的逐步淬火，中间淬火和临界退火以及锰的分配。然后，在临界退火温度下保持时间对奥氏体化，晶粒粗化动力学，异常晶粒长大的影响，总结了马氏体的体积分数。接下来，讨论了冷变形（特别是轧制）和加热速率对于通过重结晶和修改奥氏体相的优选形核部位而形成细晶粒DP微结构（具有链状马氏体岛）的重要性。此外，还讨论了严重塑性变形技术（例如，受约束的凹槽压制），热循环（多步或重复性临界间退火）和球化热处理的应用。最后，回顾了回火，淬火时效和烘烤硬化对DP钢性能的影响。这份简短的概述显示了常规和创新的加工路线可以为DP钢的潜在工业应用提供机遇，