| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing for Energy Applications II
|
| Presentation Title |
Microstructure of the Ferritic-martensitic Steels From Simulated Additive Manufacturing Heat Treatment |
| Author(s) |
Weicheng Zhong, Lizhen Tan, Kevin G. Field, Niyanth Sridharan, Ying Yang, Kurt Terrani |
| On-Site Speaker (Planned) |
Weicheng Zhong |
| Abstract Scope |
Direct energy deposition that is one form of additive manufacturing (AM) is being developed to produce ferritic-martensitic (FM) steel components for nuclear applications. In this study, a cyclic heat treatment that simulates AM processing was applied to three new FM steels using a dynamic thermal-mechanical simulator system, including Fe-11Cr-2Mn, Fe-9Cr-4Mn, and Fe-10Cr-2Mn with minor V, Ta, and W additions. The goal of the work is to understand and compare the microstructures of the FM steels subjected to the same simulated AM heat treatment. The steels demonstrated mostly lath structure with some heterogeneous grains/domains. Transmission electron microscopy revealed V/Ta-rich MX and M23C6 precipitates with densities on the order of 1021 and 1020 m-3, respectively, in the Fe-11Cr-2Mn and Fe-9Cr-4Mn. In contrast to conventional FM steels, M23C6 with an average size of 30-35 nm was observed mostly within grains. On the other hands, no M23C6 or MX precipitate was observed in Fe-10Cr-2Mn. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |