About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Mechanical Behavior of Nuclear Reactor Materials and Components III
|
Presentation Title |
Irradiation and Nanomechanical Performance of Additively Manufactured, In Situ Tempered Grade 91 Steel |
Author(s) |
Calvin R. Lear, Emily Proehl, Todd Steckley, Matthew Chancey, Hyosim Kim, Yongqiang Wang, Tuhin Mukherjee, Jeff Bickel, Tarasankar DebRoy, Peter Hosemann, Thomas Lienert, Stuart Maloy |
On-Site Speaker (Planned) |
Calvin R. Lear |
Abstract Scope |
Laser-directed energy deposition (L-DED) offers significant savings in tooling and material. However, Grade 91 steel contains mostly fine martensite when produced using L-DED. This renders a promising reactor material – resistant to radiation and high-temperature creep in the wrought form – extremely brittle. In place of a traditional tempering heat treatment, which would limit part size and increase expense, the principles of multi-pass welding were used to temper L-DED build layers in situ. To understand the impact of L-DED and in situ tempering (i.e., changes in feature size and phase) on the radiation tolerance of Grade 91 steel, wrought material and L-DED samples built with and without the in situ “pre-heat” were irradiated with self-ions (300 °C, 60 dpa, 5e-3 dpa/s) and protons (300 °C, 0.3 dpa, 1e-5 dpa/s). The accumulation of radiation-induced defects in these samples and the resulting changes to their nanomechanical behavior are considered. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Additive Manufacturing, Nuclear Materials |