About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Developments in Plate and Line Pipe Steels
|
| Presentation Title |
Non-isothermal modeling of NbC nanoprecipitation during TMCP of X70 microalloyed steels using PRISMA (ThermoCalc) |
| Author(s) |
Rishav Raj, Barry J Wiskel, Douglas Ivey, Michael Gaudet, Hani Henein |
| On-Site Speaker (Planned) |
Rishav Raj |
| Abstract Scope |
Nb content and rolling temperature during thermomechanical controlled processing (TMCP) influence NbC nanoprecipitation in X70 microalloyed steels. These precipitates affect grain size and impact strength and toughness, making it essential to understand their formation. Three (3) steels, with either 0.06 wt% or 0.03 wt% Nb and/or with different cooling rates during rolling were studied. Matrix dissolution, in combination with transmission electron microscopy and X-ray diffraction, were used to quantify the size distribution and volume fraction of NbC nanoprecipitates in each steel. NbC precipitation was modeled using the PRISMA module of Thermo-Calc (using non-isothermal temperature profiles based on mill measurements and thermal models). Model results compared favorably with the measured NbC size distributions and confirmed that the majority of NbC precipitation occurred during finish rolling (~950-800oC). Simulations with modified rolling profiles were used to show the effect of rolling temperature and time on NbC precipitation. |