|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||Roadmap for Tailoring the Strength and Ductility of Ferritic/Martensitic T91 Steel via Thermo-mechanical Treatment
||Miao Song, Cheng Sun, Zhe Fan, Youxing Chen, Ruixian Zhu, Kaiyuan Yu, Karl T Hartwig, Haiyan Wang, Xinghang Zhang
|On-Site Speaker (Planned)
Development of ferritic/martensitic (F/M) steels with high strength and excellent ductility are important as these steels are considered as candidate materials for life extension of current nuclear reactors and the design of next generation nuclear reactors. Recent studies show that equal channel angular extrusion (ECAE) was able to improve mechanical strength of ferritic T91 steels moderately. Here, we examined several strategies to further enhance the mechanical strength of T91 while maintaining its ductility. Certain thermo-mechanical treatment (TMT) enabled by combinations of ECAE, water quench and tempering may lead to “ductile martensite” with high strength at an unprecedented level in T91 steels. The evolutions of microstructures and mechanical properties of T91 steels were investigated in detail, and transition carbides were identified in water quenched T91 steel. This study provides guideline for tailoring the microstructure and mechanical properties of T91 steels via ECAE enabled TMT.