About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmental Degradation of Multiple Principal Component Materials
|
Presentation Title |
Initial Hot Corrosion Behavior of Graded Composition Transition Joints and Dissimilar Metal Weldments of P91&304 under Molten Sulfate Salts |
Author(s) |
Ting Sun, Shanshan Hu, Xingbo Liu |
On-Site Speaker (Planned) |
Ting Sun |
Abstract Scope |
Graded composition transition joints (GCTJs) of P91&304, featuring macro linear compositional gradients, exhibit superior creep strength over dissimilar metal weldments (DMWs). However, the direct contact between P91 and 304 would induce galvanic corrosion under molten sulfate salts, leading to initial pitting attacks at the joining interface and thus compromising the creep resistance. This investigation examines the initial hot corrosion in GCTJs and DMWs of P91&304 at 700°C. Utilizing digital microscopy, scanning electron microscopy (SEM), electrochemical testing, and scanning Kelvin probe force microscopy (SKPFM), the morphological characteristics and the initial sites of pits are characterized in detail. The findings provide essential insights into hot corrosion initiation of joints, setting the stage for further exploration into crack initiation under stress and corrosive conditions. |
Proceedings Inclusion? |
Planned: |
Keywords |
Iron and Steel, High-Temperature Materials, Other |