|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals and Materials
||The Evolution of Precipitates in a Novel Heat-resistant Martensitic Steel During Creep
||Pengyu Wen, Haiwen Luo, Zhengdong Liu, Zhengzong Chen
|On-Site Speaker (Planned)
In the past decades, several 9-12 wt.% Cr containing martensitic steels have been researched for the application in ultra-supercritical power plants at 650 ℃, which is still a worldwide challenge. Among them, G115 martensitic steel, which was developed in China, is one of promising candidates. It has the basic composition of 9% Cr-3% W-3% Co and also contains 1% Cu and the optimized contents of B and N, leading to much better creep strength and creep ductility than P92. Both M23C6 carbides and ε-Cu particles were found during the tempering of G115, and the former have finer size than those in P92, which results in Laves phase to form with the refined size too during the latter creep stage but no BN found. All these formed precipitates shall contribute to improved creep performance of G115 since they dominate the recovery kinetics of tempered martensitic lath structure.