| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Steels for Sustainable Development
|
| Presentation Title |
Exploring the Impact of N Solubility and Trace Elements on the Creep Properties of P92 Steel |
| Author(s) |
Stoichko Antonov, Martin Detrois, Paul D. Jablonski |
| On-Site Speaker (Planned) |
Stoichko Antonov |
| Abstract Scope |
Trace elements can have major consequences on the properties of creep resistant martensitic steels. To better understand the changes in microstructure and mechanical performance associated with the variation of trace elements and enable design of steels operating at more demanding conditions, we formulated three versions of P92 within the specified allowable N, B, C and Si ranges. Different service conditions were explored, and >80% decrease in creep life was observed at 625°C 155MPa for the highest B and N containing alloy. Multiscale characterization (OM, SEM, TEM) revealed key changes due to the trace element variation. The high trace content alloy formed deleterious BN precipitates with morphology that would promote crack nucleation, but also formed higher fractions of beneficial MX precipitates. The alloy with the lowest trace content showed the best creep performance – a result of the refined precipitate populations and the absence of large-scale inclusions and BN precipitates. |