About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrafine-Grained and Heterostructured Materials (UFGH) XIV
|
| Presentation Title |
Exceptional cryogenic-to-ambient impact toughness of a low carbon micro-alloyed steel with a multi-heterogeneous structure |
| Author(s) |
Xiaoning Xu |
| On-Site Speaker (Planned) |
Xiaoning Xu |
| Abstract Scope |
A low-carbon micro-alloyed (LCMA) steel with a body-centered cubic (bcc) crystal structure suitable for extremely low temperatures was developed by overcoming the intrinsic ductile-to-brittle transition in bcc alloys at cryogenic temperatures. The excellent cryogenic-to-ambient impact toughness in the LCMA rolled plate results from its heterogeneous microstructure, which gradually changes from bamboo-like ultrafine grains (~ 1.1 μm) on the surface to relatively equiaxed coarse grains in the core (~ 3.4 μm), accompanied by a distinct texture gradient variation. The heterostructured LCMA steel displays a cryogenic impact toughness of ⁓200 J/cm2 at 77 K, which is 23 times higher than the coarse-grained LCMA steel. Such high impact toughness of heterostructured LCMA arises from the coordinated deformation mechanisms over different length-scales coupled with delamination toughening. This low alloy steel with its heterogeneous microstructure which exhibits extraordinary impact toughness at cryogenic temperatures highlights the possibility of materials design strategies for future sustainable development. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
钢铁, 表征, 机械性能 |