In microalloyed steels, interphase precipitation involves the formation of precipitates at the ferrite/austenite interface during their transformation. The study on interphase precipitation has been ongoing since the 1970s and remains highly relevant today. While this metallurgical approach has been applied in various products of advanced steels, its application to cold‐rolled steels is still absent. This study presents a development of cold‐rolled dual‐phase (DP) steels strengthened by interphase‐precipitated carbides. A CALPHAD‐based approach is established to facilitate austenite to ferrite transformation coupled with interphase precipitation during simulated annealing for cold‐rolled DP steels. Further experimental investigations on the effects of V and Mo optimize the alloy composition, and the corresponding nano/microstructures are validated by transmission electron microscopy (TEM) and atom probe tomography. Besides, this work further addresses the impacts of interfacial segregation and microsegregation bands on the capability of interphase precipitation in the studied steels. In summary, this work charts a new pathway for the development of cold‐rolled DP steels strengthened by interphase‐precipitated carbides, advancing the realm of high‐strength steels.

中文翻译：

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冷轧双相钢带中的相间析出：设计和挑战

在微合金钢中，相间析出涉及在铁素体/奥氏体界面转变过程中析出物的形成。关于相间降水的研究自 20 世纪 70 年代以来一直在进行，至今仍然具有高度的相关性。虽然这种冶金方法已应用于各种先进钢产品，但在冷轧钢中的应用仍然缺乏。本研究介绍了通过相间沉淀碳化物强化的冷轧双相（DP）钢的开发。建立了一种基于 CALPHAD 的方法，以促进冷轧 DP 钢模拟退火过程中奥氏体向铁素体转变以及相间析出。对 V 和 Mo 影响的进一步实验研究优化了合金成分，并通过透射电子显微镜 (TEM) 和原子探针断层扫描验证了相应的纳米/微米结构。此外，这项工作还进一步解决了界面偏析和微观偏析带对所研究钢中相间析出能力的影响。综上所述，这项工作为开发相间析出碳化物强化冷轧DP钢开辟了一条新途径，推进了高强度钢的领域。