About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Accelerated Qualification of Nuclear Materials Integrating Experiments, Modeling, and Theories
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Presentation Title |
Effects of Neutron Irradiation on the Fracture Behavior of PM-HIP and Cast Grade 91 Steel |
Author(s) |
Saquib Bin Habib, David Frazer, Donna P. Guillen, Janelle P. Wharry |
On-Site Speaker (Planned) |
Saquib Bin Habib |
Abstract Scope |
The goal of this study is to assess the fracture behavior of neutron irradiated ferritic Grade 91 steels produced by powder metallurgy with hot isostatic pressing (PM-HIP) as compared to castings. The nuclear industry is interested in replacing castings with PM-HIP alloys for their microstructural uniformity and higher strength. However, little is known about how the fracture modes of PM-HIP alloys compare to that of castings, especially under irradiation.
This study evaluates fracture behavior through uniaxial tensile testing of PM-HIP and cast Grade 91 after neutron irradiation to ~1 and ~3 displacements per atom (dpa) at ~400°C. The PM-HIP alloy exhibits less hardening and embrittlement, although a yield drop phenomenon appears. Scanning electron microscopy of fracture surfaces reveals ductile dimples in the PM-HIP samples, whereas quasi-cleavage dominates the cast samples. Transmission electron microscopy of fracture surfaces reveals the role of heterogeneous dislocation loop nucleation on fracture mechanisms. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Characterization, Mechanical Properties |