An ultra-high-strength 12Mn maraging steel realized via nanoscale heterostructure engineering

作者：Yang, Mujin; Huang, Chao; Yao, Zhifu; Yang, Zhijie; Li, Zhou; Wang, Cuiping^*; Wu, Haichen; Yang, Tao; Zhao, Yilu; Wang, Shuai^*; Liu, Xingjun^*

来源：Materials Letters, 2023, 349: 134770.

DOI：10.1016/j.matlet.2023.134770

• Microstructure
• Particle
• nanosize
• Maraging steels
• Fe 2 TiSi phase
• Nano-austenite layer

A 12Mn maraging steel Fe-12Mn-5Co-1Ti-1Mo-1Si, strengthened by the Heusler Fe2TiSi phase, was designed with nanoscale heterostructures. When aged at 450 & DEG;C, fine Fe2TiSi particles uniformly precipitate within the martensite lath, contributing as the main strengthening phase. At the same time, a nanoscale austenite layer was observed to grow at the lath interface, significantly toughening the martensite lath matrix. With this hierarchical nano-structure, the super-high tensile strength of -1700 MPa with good elongation of -7 % at break was achieved. Our case uncovers that hierarchical nanoscale heterogeneous microstructure could pave a new path to achieve synergistic improvement of strength and ductility..

• 单位
  中国科学院宁波材料技术与工程研究所; 厦门大学; test; TEST; 山东省医学科学院