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Microstructural characterization of Inconel 718 alloy after pulsed laser surface treatment at different powers
摘要： An annealed Inconel 718 alloy was surface-treated by pulsed laser at three different powers (100, 50 and 25 W). Microstructural changes induced by the laser treatments were characterized by use of electron backscatter diffraction and electron channeling contrast imaging techniques. Results show that both annealing twins and strengthening precipitates profusely existing in the as-received specimen are dissolved at elevated temperatures during the laser irradiation. Meanwhile, in the melting zone (MZ), densities of low angle boundaries (LABs) are greatly increased with a large number of Laves phases preferentially distributed along such LABs. For different specimens, widths and depths of their MZs are found to be gradually reduced with decreasing the laser powers. Orientation analyses reveal that the columnar grains in the MZ of the 100 W specimen could inherit orientations existing in the matrix while lower laser powers promote the formation of more nuclei with scattered orientations to grow to be granular grains in the MZ. Hardness tests reveal that the MZs of all laser-treated specimens are softer than the matrix probably due to both precipitate dissolution and grain coarsening.
关键词： pulsed laser surface treatment,hardness,grain boundaries,Inconel 718 alloy,electron backscatter diffraction
更新于2025-09-16 10:30:52
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Finish machining-induced surface roughness, microhardness and XRD analysis of selective laser melted Inconel 718 alloy
摘要： Selective laser melting (SLM) is one of the most commonly used additive manufacturing (AM) techniques to manufacture metal components; however, during building process partially melted powders and/or pores on the outer surface of metallic parts results in very high surface roughness and eventually poor surface quality of components manufactured by selective laser melting. Thus, post-processing is needed to improve surface quality and also control subsurface characteristics. Hence, this study presents the effects of finish machining process on surface integrity characteristics including surface roughness, microhardness and XRD analysis of selective laser melted (SLMed) Inconel 718 alloy. In machining process of SLMed Inconel 718 alloy, the effect feed rate on measured outputs was also examined. Besides, the role of cold air on surface integrity characteristics was also presented in this study. This study reveals that arithmetic average surface roughness of as-built SLMed Inconel 718 can be lowered more than 90% with finish machining post processing operation. Increased feed rate results in work hardening on the surface and subsurface and eventually microhardness of surface and subsurface increases notably as compared to as-built SLMed Inconel. Finish machining process deeply influences XRD patterns of SLMed Inconel 718 alloy.
关键词： Additive Manufacturing,Finish Machining,Surface integrity,Selective Laser Melting,Inconel 718 alloy
更新于2025-09-12 10:27:22
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Laser Polishing of Additive Manufactured Superalloy
摘要： Laser additive manufacturing has attracted considerable interest as a promising digital manufacturing technology in recent years. However, poor surface quality restricts its practical application. In this paper, we demonstrate the capability of laser polishing in rough surface of additive manufactured Inconel 718 alloy. Both as-received surface and laser-polished surface were analyzed carefully by Confocal Microscope, Scanning Electron Microscopy, Energy Dispersive Spectrometer and X-ray Diffraction. The results revealed that as-received Inconel 718 alloy with surface roughness more than 7 μm could be reduced to less than 0.1 μm through laser polishing (LP) process. Moreover, microstructure, micro-hardness and wear resistance of laser-polished zone were investigated. This preliminary study has shown the potential of laser polishing in improving surface finish and properties of additive manufactured superalloy without damage to the substrate.
关键词： Laser polishing,Additive manufacturing,Inconel 718 alloy
更新于2025-09-12 10:27:22