| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Friction Stir Welding and Processing XII
|
| Presentation Title |
Surface Alloying Due to WC Tool Wear during FSP and Its Effects on the Microstructure and Mechanical Properties of Topmost Steel Layer |
| Author(s) |
Hajime Yamamoto, Yudai Imagawa, Yuji Yamamoto, Kazuhiro Ito |
| On-Site Speaker (Planned) |
Hajime Yamamoto |
| Abstract Scope |
Friction stir processing (FSP) is a solid state method for surface modification using a rotational tool. However, the tool wear has been considered as the unavoidable issue in FSP of high strength materials. On the other hand, we found that the WC tool wear in low-carbon steels caused alloying of the topmost steel layer with the tool constituent elements. Some of the WC particles in the tool reacted with the Fe atoms to form Fe4W2C phase at the tool/steel interface during FSP, followed by fragmentation and decomposition due to shear stress. The austenitized topmost steel layer transformed to the martensite with supersaturated W and C atoms during the cooling time. With increasing the W and C contents, compressive residual stress was generated in addition to solid solution hardening. The unique alloying indicates positive utilization of the tool wear during FSP as a new line of thought. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Surface Modification and Coatings, Mechanical Properties |