| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrafine-grained and Heterostructured Materials (UFGH XI)
|
| Presentation Title |
N-36: Microstructure and Tensile Behavior of Nanostructured Gradient TWIP Steel |
| Author(s) |
Jie Ding, Zhongxia Shang, Jin Li, H. Wang, Xinghang Zhang |
| On-Site Speaker (Planned) |
Xinghang Zhang |
| Abstract Scope |
Gradient nanostructured metallic materials have shown unique mechanical properties, such as high strength and good work hardening ability. The mechanisms of gradient structure induced work hardening remain less well understood. Here a TWIP steel with large equiaxed grains was processed by surface mechanical grinding treatment, and the subsequent gradient structures formed near surface consist of surface nanolaminate layer, a mixed layer of deformation twins and shear bands, and a deformation twin layer. Tensile studies show that the gradient structures increase the yield strength of the TWIP steel prominently. Strain hardening appears to reach maxima near the interface regions between the layers. ASTAR crystal orientation map indicates distinct transition of high angle grain boundaries and twin boundaries near interfaces as well as the accumulation of geometrically necessary dislocations. These in-depth studies provide insight into the design of high strength, work hardenable gradient nanostructured alloys. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume |