About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Mechanical Behavior of Nuclear Reactor Materials and Components III
|
Presentation Title |
A New Microcrack Healing Mechanism in an Annealed 14YWT Nanostructured Ferritic Alloy |
Author(s) |
Md Ershadul Alam, Soupitak Pal, Nicholas J Cunningham, G. R. Odette |
On-Site Speaker (Planned) |
Md Ershadul Alam |
Abstract Scope |
Pre-existing microcracks form in a deformation processed 14YWT nanostructured ferritic alloy by well understood mechanisms, and that may hinder fabrication of defect-free components. Examined crack healing by short time, high temperature anneals and identified a new healing mechanism that involves the redistribution and coarsening of an initially small TiCON inclusions to coarser particles on crack faces, which locally displace matrix atoms to efficiently fill and heal the cracks. Crack healing improved the total room temperature tensile elongation from ≈ 0% for as-processed to ≈ 21% for the 1300ºC/5h annealed condition in tests with loading normal to the crack plane. Remarkably, this very efficient mechanism even healed macroscopic through-thickness fatigue cracks. This concept can be applicable to processing and self-healing of other materials at long time service conditions. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Mechanical Properties, Iron and Steel |