| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Response of Materials Investigated Through Novel In-Situ Experiments and Modeling
|
| Presentation Title |
Modeling In-situ X-ray Diffraction of Dislocation Evolution during Selective Laser Melting of 316L Stainless Steels with Discrete Dislocation Dynamics and GPU-accelerated Raytracing |
| Author(s) |
Dylan Madisetti, Markus Sudmanns, Christopher Stiles, Jaafar El-Awady |
| On-Site Speaker (Planned) |
Dylan Madisetti |
| Abstract Scope |
Large-scale, three-dimensional (3D) discrete dislocation dynamics (DDD) simulations are used to capture the in-situ evolution of predicted X-ray diffraction (XRD) measurements: specifically, dislocation cell-wall formation during the cooling stage of selective laser melting of 316L. These simulations enable the simultaneous study of temperature, dislocation microstructure, alloy composition, interstitial concentration, and solute stresses. The atomic representations of 316L from density functional theory calculations are used in a GPU-accelerated X-ray ray-tracing method. The resultant reflected X-ray is captured by a virtual sensor resulting in micro-Laue or Debye-Scherrer images. Using supercomputing resources, this ray-tracing process can be performed continuously as the dislocation microstructure evolves. These in-situ simulations exhibit peak broadening, peak shift, and spread of select Laue spots, which are phenomena observed in experimental measurements. Microstructures from DDD are utilized to understand spot distortion, providing insight into experimental in-situ XRD and observed underlying microstructure evolution. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Modeling and Simulation, Characterization |