About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advances in Ferrous Process Metallurgy
|
| Presentation Title |
Effect of Al or Ti Addition on the Austenite Grain Size and Ferrite Formation in Ultra-Low Oxygen Weld Metal of Low-Carbon Steel |
| Author(s) |
Takashi Mizuguchi, Masatoshi Sukemiya, Takumi Yoneji, Daichi Miyata |
| On-Site Speaker (Planned) |
Takashi Mizuguchi |
| Abstract Scope |
Effects of Al or Ti addition on the ferrite formation in ultra-low oxygen (about a few tens ppm) weld metal of low carbon steels were investigated. A bead-on-plate welding experiments was performed with a tungsten-inert-gas welding system. The double nozzle was attached to the welding torch used, Ar was passed along the outer nozzle and He is added along the inner nozzle.
With increasing Al content, the formation positions of intergranular ferrite and ferrite side plates became farther from the welding endpoint, suggesting an increase in formation temperature. On the other hand, the formation temperatures decreased with increasing Ti content. These changes in formation temperature could be explained by the migration of the CCT curve associated with changes in austenite grain size due to the formation of oxide inclusions and the pinning effect of the austenite grain boundary. |