| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Defects and Properties of Cast Metals
|
| Presentation Title |
Influence of Composition on the Solidification and Weldability of Cast Austenitic Stainless Steels |
| Author(s) |
Sean M. Orzolek, John DuPont |
| On-Site Speaker (Planned) |
Sean M. Orzolek |
| Abstract Scope |
Austenitic stainless steels such as 0.4C-25Cr-35Ni-1Nb, HP-Nb alloys are commonly used in high temperature applications above 850°C and exhibit superior creep properties due to chromium and niobium carbide precipitation strengthening. However, the high carbide content increases the susceptibility to hot cracking during welding and riser removal. The microstructure is a result of the solidification conditions and composition of the alloy, however, limited studies have focused on the solidification of HP-Nb alloys. Therefore, the objective of this study is to improve the understanding of the solidification in the C-Cr-Nb-γ pseudo-quaternary system in order to improve the weldability of HP-Nb alloys. In this study, a systematic matrix of 30 alloys are evaluated in order to determine the influence of composition on the solidification path and resultant microstructure. High temperature mechanical testing using a GleebleŠ is used to relate the composition and microstructure to the weldability and susceptibility to hot cracking during fabrication. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |