| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Advancements in Steel Structural Refinement
|
| Presentation Title |
Effect of Nb Microalloying on the HAZ Grain Growth Kinetics and Precipitation Dissolution during Welding |
| Author(s) |
Iņigo Iturrioz, Nerea Isasti, Jose Rodriguez-Ibabe, Pello Uranga, Nobuyuki Ishikawa, Daichi Izumi, Douglas Stalheim, David Jarreta, David Martin |
| On-Site Speaker (Planned) |
Pello Uranga |
| Abstract Scope |
Low carbon Nb microalloyed steels, combined with thermomechanically controlled rolling, are usually employed for producing modern high strength/high toughness linepipe steels. Property control in the welds is usually a critical point in these applications. Therefore, alloy design and hot rolling strategy must be carefully defined to avoid austenite grain size coarsening in the heat affected zone (HAZ) and to achieve an optimum combination between strength and toughness. In order to analyze the effect of Nb on the competition between austenite grain growth and dissolution of precipitates during welding, laboratory heat treatment simulations reproducing the heating cycle were carried out for different low carbon Nb microalloyed steels. The initial precipitation state in the plates was also modified by different hot rolling strategies. The interaction between austenite grain growth and precipitation is modeled, in order to predict the evolution of the microstructure in the HAZ after welding. |