Abstract
As a typical additive manufacturing technique, direct energy deposition is restricted from further application due to the presence of residual stress and the structural deformation. Thus, minimizing the residual stress plays a crucial role in additive manufacturing. In this work, a transverse static magnetic field is introduced in the laser remelting of Inconel 718 superalloy to investigate the effects on residual stress and microstructural change. The x-ray diffraction technique was used to examine the residual stress variation. Optical microscope and scanning electron microscope were applied to observe the microstructure evolution. It was found that the compressive residual stress of the remelted region was notably reduced from 392.50 to 315.45 MPa under the effect of the magnetic field of 0.55 T. Furthermore, it was observed that the average dendrite spacing was reduced by about 32% under the magnetic field. During the laser remelting process, the imposed electromagnetic force minimized the flow field within the molten pool, inhibiting the heat transfer and minimizing the cooling rate. These directly reduced the residual stresses. Based on research findings, the magnetic field can be a potential method to eliminate the residual stress in laser additive manufacturing components.
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Acknowledgments
The authors would like to acknowledge the National Natural Science Foundation of China (Nos. 51604171, 51690162 and 51701112), the Shanghai Science and Technology Committee (Nos. 17JC1400602 and 19DZ1100704), Shanghai Sailing Program (Grant Nos. 19YF1415900), Chinese National Science and Technology Major Project “Aeroengine and Gas Turbine” (2017-VII-0008-0102).
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This article is part of a special topical focus in the Journal of Thermal Spray Technology on Advanced Residual Stress Analysis in Thermal Spray and Cold Spray Processes. This issue was organized by Dr. Vladimir Luzin, Australian Centre for Neutron Scattering; Dr. Seiji Kuroda, National Institute of Materials Science; Dr. Shuo Yin, Trinity College Dublin; and Dr. Andrew Ang, Swinburne University of Technology.
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Nie, J., Chen, C., Shuai, S. et al. Effect of Static Magnetic Field on the Evolution of Residual Stress and Microstructure of Laser Remelted Inconel 718 Superalloy. J Therm Spray Tech 29, 1410–1423 (2020). https://doi.org/10.1007/s11666-020-01039-0
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DOI: https://doi.org/10.1007/s11666-020-01039-0