Impact of scanning velocity on microstructure and mechanical properties of Inconel 738LC alloys fabricated by laser powder bed fusion

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Authors

Yixuan Chen¹ , Zirong Zhai¹ , Weihao Wang¹

1. ShanghaiTech University

Conference / event

The Minerals, Metals & Materials Society (TMS) 2023 Annual Meeting & Exhibition, March 2023 (San Diego, United States)

Poster summary

The microstructure and mechanical properties of IN738LC fabricated by laser powder bed fusion were investigated in this work. Three processing parameters were chosen with a specific volumetric energy density of 55.56 J/mm3 but varying scanning velocity and laser power. The electron backscatter diffraction results revealed that the fraction of the recrystallized grains increased by 15% and the average grain size became smaller with the increased scanning velocity and laser power. The first dendrite arm spacing also showed a slight difference caused by cooling rate variation. Vickers hardness of three sets of parameters varied from 367.6±8.0HV to 396.5±10.9HV. The tensile test results indicated that better mechanical properties were achieved by choosing a high-speed scanning speed strategy. Computational fluid dynamics was performed to verify the melt pool morphology and cooling rate distribution. The CFD results revealed that the more uniform cooling rate distribution caused by low-speed scanning velocity in the melt pool.

Keywords

LPBF, Inconel 738LC,, Volumetric energy density, Microstructure, Mechanical properties

Research areas

Material Sciences

References

No data provided

Funding

No data provided

Supplemental files

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Additional information

Competing interests

No competing interests were disclosed.

Data availability statement

The datasets generated during and / or analyzed during the current study are available from the corresponding author on reasonable request.

Creative Commons license

Copyright © 2023 Chen et al. This is an open access work distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.