16 Papers
105 Citations
Li Ma is an academic researcher from National Institute of Standards and Technology. The author has contributed to research in topics: Finite element method & Nanoindentation. The author has an hindex of 10, co-authored 16 publications.
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Papers
Application of Finite Element, Phase-field, and CALPHAD-based Methods to Additive Manufacturing of Ni-based Superalloys.
Trevor Keller,Greta Lindwall,Supriyo Ghosh,Li Ma,Brandon M. Lane,Fan Zhang,Ursula R. Kattner,Eric A. Lass,Jarred C. Heigel,Yaakov Idell,Maureen E. Williams,Andrew J. Allen,Jonathan E. Guyer,Lyle E. Levine +13 more
TL;DR: Numerical simulations are used in this work to investigate aspects of microstructure and microseg-regation during rapid solidification of a Ni-based superalloy in a laser powder bed fusion additive manufacturing process.
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Thermographic measurements of the commercial laser powder bed fusion process at NIST
TL;DR: The design, execution, and results of high speed, high magnification in-situ thermographic measurements conducted at the National Institute of Standards and Technology (NIST) focusing on the melt pool region of a commercial L-PBF process are detailed.
On the primary spacing and microsegregation of cellular dendrites in laser deposited Ni–Nb alloys
TL;DR: In this article, an alloy phase-field model is used to simulate solidification microstructures at different locations within a solidified molten pool, and the effects of laser beam speed and the location within the melt pool on the primary arm spacing and on the extent of Nb partitioning at the cell tips are investigated.
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Single-Track Melt-Pool Measurements and Microstructures in Inconel 625
Supriyo Ghosh,Li Ma,Lyle E. Levine,Richard E. Ricker,Mark R. Stoudt,Jarred C. Heigel,Jonathan E. Guyer +6 more
TL;DR: In this paper, single-track laser melting experiments and simulations on Inconel-625 were used to estimate the dimensions and microstructure of the resulting melt pool, based on a design-of-experiments approach which uses multiple laser power and scan speed combinations.
On the primary spacing and microsegregation of cellular dendrites in laser deposited Ni-Nb alloys
TL;DR: In this article, an alloy phase-field model is used to simulate solidification microstructures at different locations within a solidified molten pool, and the effects of laser beam speed and the location within the melt pool on the primary arm spacing and on the extent of Nb partitioning at the cell tips are investigated.
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