Physical metallurgy of medium-Mn advanced high-strength steels

作者：Binhan Sun, Alisson Kwiatkowski da Silva, Yuxiang Wu, Yan Ma, Hao Chen, Colin Scott, Dirk Ponge, Dierk Raabe · 发表于：International Materials Reviews · 年份：2023 · DOI：10.1080/09506608.2022.2153220 · 被引用次数：144 · 研究领域：Microstructure and Mechanical Properties of Steels、Magnetic Properties and Applications、Metal Alloys Wear and Properties

Steels with medium manganese (Mn) content (3∼12 wt-%) have emerged as a new alloy class and received considerable attention during the last decade. The microstructure and mechanical response of such alloys show significant differences from those of established steel grades, especially pertaining to the microstructural variety that can be tuned and the associated micromechanisms activated during deformation. The interplay and tuning opportunities between composition and the many microstructural features allow to trigger almost all known strengthening and strain-hardening mechanisms, enabling excellent strength-ductility synergy, at relatively lean alloy content. Previous investigations have revealed a high degree of microstructure and deformation complexity in such steels, but the underlying mechanisms are not adequately discussed and acknowledged. This encourages us to critically review and discuss these materials, focusing on the progress in fundamental research, with the aim to obtain better understanding and enable further progress in this field. The review addresses the main phase transformation phenomena in these steels and their mechanical behaviour, covering the whole inelastic deformation regime including yielding, strain hardening, plastic instability and damage. Based on these insights, the relationships between processing, microstructure and mechanical properties are critically assessed and rationalized. Open questions and challenges with respect to both, fundament...