About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advances in Ferrous Process Metallurgy
|
| Presentation Title |
Effects of Nb and Si addition on the microstructure and mechanical properties in friction welded joint of non-quenched and tempered steels |
| Author(s) |
Bongjun Kim, Joonoh Moon, Jun-Yun Kang, Jungwon Lee, Yonghyun Kim |
| On-Site Speaker (Planned) |
Bongjun Kim |
| Abstract Scope |
Non-Quenched and Tempered steels have mechanical properties comparable to quenched and tempered steel without heat treatment. Due to their excellent properties and cost-saving effect owing to the omission of heat treatment process, NQT steels are widely used in the manufacturing of various structural components. This work aims to investigate the effects of alloying elements on the microstructure evolution and mechanical properties in friction welded joints of NQT steels. For this purpose, NQT steels containing different contents of Si and Nb were prepared and then friction-welded with S45C steel. The microstructures of the friction-welded joints were characterized using optical microscopy, scanning electron microscopy, electron backscatter diffraction, and transmission electron microscopy. In addition, the mechanical properties were evaluated by tensile, impact, and hardness testing. Finally, the correlation between grain size, precipitate distribution, and mechanical properties of the friction-welded joints was discussed with respect to the addition of Nb and Si. |