About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmental Degradation of Additively Manufactured Alloys
|
Presentation Title |
Sensitization of Austenitic Alloys Made by Laser Powder Bed Fusion |
Author(s) |
Jingfan Yang, Laura Hawkins, John Snitzer, Xiang Liu, Miao Song, Lingfeng He, Xiaoyuan Lou |
On-Site Speaker (Planned) |
Jingfan Yang |
Abstract Scope |
This talk gives an overview of the current understandings of sensitization behavior of Alloy 800H and 316L stainless steels that are manufactured by laser powder bed fusion additive manufacturing (AM). The degree of sensitization (DOS) and carbide evolution will be discussed as the function of temperature, time, and microstructure. Different from conventional cast/wrought materials, the fast laser solidification resulted in non-equilibrium heterogeneous microstructures, including hierarchical boundary structures, ultrafine dislocation structures, and inhomogeneous element segregation, which further impact elemental diffusion, carbide nucleation and growth kinetics. AM austenitic alloys exhibited different sensitization/desensitization kinetics and corrosion behavior as compared to their wrought counterparts. The underlying sensitization mechanisms, including transport phenomena and carbide precipitation at elevated temperatures will be discussed. The mechanistic explanation focuses on the roles of dislocation cellular structures, boundary types, and carbon level. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Environmental Effects, Iron and Steel |