A novel steel combining the “quenching and tempering (Q&T)” process was exploited that can achieve the enhancement of austenite by interface migration during tempering the martensitic matrix mixed with films of austenite. A high uniform elongation (12%) combined with high yield tensile strength (1500 MPa) was obtained, which showed distinct advantages over all the other advanced high strength steels under development for a lightweight car body. Furthermore, the effect of austenite on enhancement of ductility in “Q&T” steels with a martensite matrix was elucidated, which suggested that the ductility was promoted by enhancing boundary sliding and delaying work hardening of the martensitic matrix.

中文翻译：

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马氏体的低温回火对奥氏体相变延展性的影响

开发了一种结合“淬火和回火（Q＆T）”工艺的新型钢，该钢可在回火与奥氏体薄膜混合的马氏体基体过程中通过界面迁移实现奥氏体的增强。获得了较高的均匀伸长率（12％）和较高的屈服拉伸强度（1500 MPa），与轻型车体正在开发的所有其他高级高强度钢相比，它们显示出明显的优势。此外，阐明了奥氏体对具有马氏体基体的“ Q＆T”钢的延展性增强的影响，这表明通过增强边界滑动和延迟马氏体基体的工作硬化来促进延性。