Effect of Static Magnetic Field on the Evolution of Residual Stress and Microstructure of Laser Remelted Inconel 718 Sup
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Effect of Static Magnetic Field on the Evolution of Residual Stress and Microstructure of Laser Remelted Inconel 718 Superalloy Jianwen Nie1 • Chaoyue Chen1,3 • Sansan Shuai1 • Xiaoqi Liu1 • Ruixin Zhao1 Jiang Wang1 • Hanlin Liao2,3 • Zhongming Ren1
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Submitted: 7 November 2019 / in revised form: 21 January 2020 Ó ASM International 2020
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 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. & Chaoyue Chen [email protected] Jiang Wang [email protected] 1
State Key Laboratory of Advanced Special Steels, School of Materials Science and Engineering, Shanghai University, Shanghai 200042, People’s Republic of China
2
ICB, UMR 6303, CNRS, Univ. Bourgogne Franche-Comte´, UTBM, 90010 Belfort, France
3
Sino-European School of Technology of Shanghai University, Shanghai 200042, People’s Republic of China
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. Keywords Inconel 718 superalloy laser direct deposition laser remelting residual stress static magnetic field thermoelectric magnetic force
Introduction The laser additive manufacture technique covers the shortage of the traditional manufacturing technique, and it has been widely used in many vital industries, such as aerospace, biomedicine, and automation (Ref 1-5). As typical laser additive manufacturing techniques, direct energy deposition (DED) and selective laser melting (SLM) can rapidly fabricate the near-net-shape components with full densit
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