Lawrence Livermore National Laboratory



Manyalibo Manyalibo

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 the NNSA’s mission of nuclear weapons life extension.

Publications and Presentations

Calta, N. P., et al. 2018. "An Instrument for In Situ Time Resolved X-ray Imaging and Diffraction During the Laser Powder Bed Fusion Additive Manufacturing Process." Review of Scientific Instruments 89(5): 055101. doi: 10.1063/1.5017236. LLNL-JRNL-739736.

Matthews, M. 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. doi: 10.1016/j.matdes.2018.05.050. LLNL-JRNL-747073.

——— . 2018. "Laser-Assisted Advanced Manufacturing." 10th CIRP Conference on Photonic Technologies, Furth, Germany, September 2018. LLNL-PRES-751323.

Matthews, M., et al. 2018. "Direct Measurements of Laser Absorptivity During Metal Melt Pool Formation Associated with Powder Bed Fusion Additive Manufacturing Processes." Journal of Laser Applications 30: 032302. doi: 10.2351/1.5040636. LLNL-JRNL-740801.

——— . 2018. "Spatial Modulation of Laser Sources for Microstructural Control of Additively Manufactured Metals." Procedia CIRP: 10th CIRP Conference on Photonic Technologies 74: 607―610. doi: 10.1016/j.procir.2018.08.077. LLNL-PROC-748826.

Perron, A., et al. 2018. "Realistic Phase-Field Modeling: A Path Towards Microstructure Tailoring?" 2018 SIAM Annual Meeting, Portland, OR, July 2018. LLNL-PRES-754458.

Ramme, J. C., et al. 2018. "Laser Intensity Profile Effects on the Solidification Microstructure of Ti-6Al-4V and Ti-5553." LLNL Technical Report doi: 10.2172/1466179. LLNL-TR-756734.

Roehling, J. D., et al. 2018. "Rapid Solidification in Bulk Ti-Nb Alloys by Single-Track Laser Melting." Journal of The Minerals, Metals & Materials Society 70(8): 1589–1597. doi: 10.1007/s11837-018-2920-2. LLNL-JRNL-743642.

Shi, R. 2018. "Applications of Mesoscale Microstructure Modeling in Metal Additive Manufacturing and Hydrogen Storage." Lawrence Livermore National Laboratory Postdoc Poster Symposium. LLNL-POST-752653.

Smith, W. L., et al. 2018. "Residual Stress Reduction of Laser Powder Bed Fusion Processes using in situ Laser Diode Annealing." 2018 Annual International Solid Freeform Fabrication Symposium, Austin, TX, August 2018. LLNL-PRES-756370.

Tapia, G., et al. 2018. "Gaussian Process-Based Surrogate Modeling Framework for Process Planning in Laser Powder-Bed Fusion Additive Manufacturing of 316L Stainless Steel." International Journal of Advanced Manufacturing Technology 94(6): 3591―3603. doi: 10.1007/s00170-017-1045-z. LLNL-JRNL-726754.

Turchi, P. A. 2018. "Viscosity and Surface Tension of Metals." LLNL Technical Report. doi: 10.2172/1438687. LLNL-TR-750486.

Vrancken, B., et al. 2018. "In-situ characterization of Tungsten Microcracking in Selective Laser Melting." Procedia CIRP: 10th CIRP Conference on Photonic Technologies  7: 107―110. doi: 10.1016/j.procir.2018.08.050. LLNL-CONF-748304.

——— . 2018. "Microcrack mitigation during Selective Laser Melting of Tungsten." Lawrence Livermore National Laboratory Postdoc Poster Symposium. LLNL-POST-752649.

Wang, Y. M., et al. 2018. "Additively Manufactured Hierarchical Stainless Steels with High Strength and Ductility." Nature Materials 17: 63–71. LLNL-JRNL-736774.

Ye, J., et al. 2018. "Laser Absorption and Scaling Behavior in Powder Bed Fusion Additive Manufacturing of Metals." CLEO: Applications and Technology 2018, San Jose, CA, May 2018. doi: 10.1364/CLEO_AT.2018.JW2A.117. LLNL-POST-751339.

——— . 2018. "Laser Absorption and Scaling Behaviors." CLEO: Applications and Technology 2018, San Jose, CA, May 2018. LLNL-ABS-743281.