About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Mechanical Behavior at the Nanoscale VII
|
Presentation Title |
Residual Stress Impacts on Indentation in Metallic Systems Susceptible to Fracture |
Author(s) |
Jia-Huei Tien, David F. Bahr |
On-Site Speaker (Planned) |
David F. Bahr |
Abstract Scope |
Nanoindentation allows for mapping some mechanical properties with relatively fine positional resolution. However, gradients in the material’s stress state or the materials properties can be challenging to deconvolve. Using an oxidized Ti64 and a hydrogen charged plain carbon steel, two materials that have evidence of fracture in these conditions we compare the indentation response. As both systems have gradients in stresses and composition, identifying how changes in the residual stresses, the actual modulus changes with composition, and changes in the residual impression and hardness requires analysis of the load-displacement curves beyond a conventional unloading approach. Separating stress effects versus strain hardening effects on material pile up requires additional topographic imaging. In general, identifying substantial (i.e. 500 MPa) tensile stresses and identifying position dependent variations in hardness or modulus (based on chemistry or texture, where the gradient varies locally) points towards structures that are more likely to exhibit brittle behavior. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Characterization, Nanotechnology |