Lawrence Livermore National Laboratory



Manyalibo Matthews

Executive Summary

We are developing new capabilities in the design and production of additively-manufactured metal parts with tailored microstructures that meet stringent performance requirements for certification. This research has broad applications to industry and directly supports national missions in nuclear weapons life extension.

Publications, Presentations, Etc.

Calta, N., et al. 2019. "Determination of Temperature Distribution in and around the Melt Pool during laser powder bed fusion by hyperspectral thermal imaging." TMS 2019 Annual Meeting and Exhibition, San Antonio, TX, March 2019. LLNL-ABS-753989.

Khairallah, S., et al. 2019. "Controlling Defects and Microstructure Evolution in Single Tracks." TMS 2019 Annual Meeting and Exhibition, San Antonio, TX, March 2019. LLNL-ABS-754140.

Martin, A. 2019. "Ultrafast Dynamics of Laser-Metal Interactions in Additive Manufacturing Alloys." Materials Today Advances 1: 100002. LLNL-JRNL-756599.

Matthews, M. 2019. "Absorptivity and Energy Scaling Associated with Laser Powder Bed Fusion Additive Manufacturing." Conference on Lasers and Electro-Optics (CLEO): Applications and Technology 2019, San Jose, CA, May 2019. Optical Society of America Technical Digest, paper AW31.5. doi: 10.1364/CLEO_AT.2019.AW3I.5. LLNL-ABS-764074.

——— . 2018 "In situ Measurements of Layer Roughness During Laser Powder Bed Fusion Additive Manufacturing Using Low Coherence Scanning Interferometry." Materials and Design 154: 347-359. LLNL-JRNL-747073.

——— . 2018 "Laser Peening: A Tool for Additive Manufacturing Post-Processing." Additive Manufacturing 24: 67-75. LLNL-JRNL-739309.

——— . 2019 "Effect of Laser Power on Defect, Texture, and Microstructure of a Laser Powder Bed Fusion Processed 316L Stainless Steel." Materials and Design 164: 107534. doi: 10.1016/j.matdes.2018.12.006. LLNL-JRNL-783860.

——— . 2019 "Energy Coupling Mechanisms and Scaling Behavior Associated with Laser Powder Bed Fusion Additive Manufacturing." Advanced Engineering Materials 21(7): 1900185. doi: 10.1002/adem.201900185. LLNL-JRNL-763217.

McKeown, J., et al. 2019. "In Situ Dynamic TEM Combined with Phase Field Modeling to Quantitatively Describe Rapid Alloy Solidification." Euromat 2019, Stockholm, Sweden, September 2019. LLNL-ABS-770229.

——— . 2019 "Measurements of Microstructure Evolution and kinetics during laser-induced rapid solidification of Al-based alloys". TMS 2019 Annual Meeting and Exhibition, San Antonio, TX, March 2019. LLNL-ABS-753513.

——— . 2019 "Melt Pool and Microstructure Characterization for AM Model Development." Microscopy & Microanalysis 25(S2): 2562. LLNL-ABS-767607.

——— . 2019 "Rapid Solidification of Al-Based Alloys Using In Situ Dynamic Transmission Electron Microscopy." Materials Science & Technology. LLNL-ABS-748404.

Perron, A., et al. 2019. "Development of a Thermodynamics-informed Materials Design Simulator." TMS 2019 Annual Meeting and Exhibition, San Antonio, TX, March 2019. LLNL-ABS-753907.

Roehling, J., et al. 2019. "Microstructural Refinement using Tailored Beam Shapes during Laser Additive Manufacturing." TMS 2019 Annual Meeting and Exhibition, San Antonio, TX, March 2019. LLNL-ABS-753991.

——— . 2019 "Reducing Residual Stress by Selective Large-Area Diode Surface Heating During Laser Powder Bed Fusion Additive Manufacturing." Additive Manufacturing 28: 228. LLNL-JRNL-766658.

Shi, R., et al. 2019. "An Integrated Simulation Framework for Additively Manufactured Ti-6Al-4V: Melt Pool Dynamics, Microstructure, Solid State Phase Transformation and Micro-Elastic Response." Journal of the Minerals, Metals, and Materials Society 71: 3640. LLNL-JRNL-767762.

——— . 2019 "Shaping Laser Beam for Microstructural Control During Metal Additive Manufacturing." TMS 2019 Annual Meeting and Exhibition, San Antonio, TX, March 2019. LLNL-ABS-754470.

Voisin, T., et al. 2019. "In Situ Characterization of Deformation Mechanisms in L-PBF 316L Stainless Steels." TMS 2019 Annual Meeting and Exhibition, San Antonio, TX, March 2019. LLNL-ABS-753972.

Vrancken, B., et al. 2019. "Tungsten Alloying to Reduce Cracking During Laser Powder Bed Fusion." Euromat 2019, Stockholm, Sweden, September 2019. LLNL-ABS-768385.