Sensitivity of Thermal Predictions to Uncertain Surface Tension Data in Laser Additive Manufacturing

Coleman, J.; Plotkowski, A.; Stump, B.; Raghavan, N.; Sabau, A. S.; Krane, M. M.; Heigel, J.; Ricker, R. E.; Levine, L.; Babu, S. S.

doi:10.1115/1.4047916

Title: Sensitivity of Thermal Predictions to Uncertain Surface Tension Data in Laser Additive Manufacturing

Journal Article · Mon Oct 05 00:00:00 EDT 2020 · Journal of Heat Transfer

DOI:https://doi.org/10.1115/1.4047916· OSTI ID:1671430

Coleman, J. ^[1];

^[2]; Stump, B. ^[2];

^[2];

^[2]; Krane, M. M. ^[3]; Heigel, J. ^[4]; Ricker, R. E. ^[5]; Levine, L. ^[5]; Babu, S. S. ^[6]

Purdue Univ., West Lafayette, IN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Purdue Univ., West Lafayette, IN (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Engineering Lab.
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Material Measurement Lab.
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

To understand the process-microstructure relationships in additive manufacturing (AM), it is necessary to predict the solidification characteristics in the melt pool. This study investigates the influence of Marangoni driven fluid flow on the predicted melt pool geometry and solidification conditions using a continuum finite volume model. A calibrated laser absorptivity was determined by comparing the model predictions (neglecting fluid flow) against melt pool dimensions obtained from single laser melt experiments on a nickel super alloy 625 (IN625) plate. Using this calibrated efficiency, predicted melt pool geometries agree well with experiments across a range of process conditions. When fluid mechanics is considered, a surface tension gradient recommended for IN625 tends to overpredict the influence of convective heat transfer, but the use of an intermediate value reported from experimental measurements of a similar nickel super alloy produces excellent experimental agreement. Despite its significant effect on the melt pool geometry predictions, fluid flow was found to have a small effect on the predicted solidification conditions compared to processing conditions. We find that this result suggests that under certain circumstances, a model only considering conductive heat transfer is sufficient for approximating process-microstructure relationships in laser AM. Extending the model to multiple laser passes further showed that fluid flow also has a small effect on the solidification conditions compared to the transient variations in the process. Furthermore, limitations of the current model and areas of improvement, including uncertainties associated with the phenomenological model inputs are discussed.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1671430

Journal Information:: Journal of Heat Transfer, Vol. 142, Issue 12; ISSN 0022-1481

Publisher:: ASMECopyright Statement

Country of Publication:: United States

Language:: English

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Title: Sensitivity of Thermal Predictions to Uncertain Surface Tension Data in Laser Additive Manufacturing

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