| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Friction Stir Welding and Processing XII
|
| Presentation Title |
Effect of Welding Parameters on Microstructure and Mechanical Properties of Friction Stir Lap Welds of an Ultrahigh Strength Steel |
| Author(s) |
Yutaka S. Sato, Shunsuke Mimura, Shun Tokita, Yusuke Yasuda, Akihiro Sato, Satoshi Hirano |
| On-Site Speaker (Planned) |
Shun Tokita |
| Abstract Scope |
In this study, effect of welding parameters on microstructure and mechanical properties of an ultrahigh strength steel (UHSS) friction-stir-lap-welded with Co-based alloy tool was examined. Friction stir lap welding of the UHSS was successfully done at various welding parameters. Tensile shear load of the lap welds was higher at the lower rotational speed. In the lap welds produced at the high rotational speed, crack was initiated from the tip of the lapped interface and then propagated into the stir zone having high fraction of martensite, possibly resulting from the stress concentration. On the other hand, the lap welds produced at the low rotational speed failed in the softened region of the heat affected zone. This study showed that the reduced brittleness of the stir zone arising from the low rotational speed was an effective strategy for the higher mechanical properties of the lap welds of the UHSS. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Joining, Iron and Steel, Mechanical Properties |