Journal ArticleDOI
Thermofluid field of molten pool and its effects during selective laser melting (SLM) of Inconel 718 alloy
TLDR
In this paper, a physical model coupled with heat transfer and fluid flow was developed to investigate the thermofluid field of molten pool and its effects on SLM process of Inconel 718 alloy, in which a heat source considering the porous properties of powder bed and its reflection to laser beam is used.Abstract:
A physical model coupled with heat transfer and fluid flow was developed to investigate the thermofluid field of molten pool and its effects on SLM process of Inconel 718 alloy, in which a heat source considering the porous properties of powder bed and its reflection to laser beam is used. The simulation results showed that surface tension caused by temperature gradient on the surface of molten pool drives to Marangoni convection, which makes fluid flow state mainly an outward convection during SLM process. Marangoni convection includes convective and conductive heat flux, both of them have effects of on molten pool shape, but the effect of convective heat flux is dominant because its magnitude is one order larger than that of conductive heat flux. The convective heat flux accelerates the flow rate of the molten metal, benefits to heat dissipation. The convective heat flux makes the molten pool wider, while the conductive heat flux makes comparably the molten pool deeper and wider. Furthermore, heat accumulation caused by multiple scanning increases convection and conduction heat flux resulting in the increase of the width and depth of the molten pool, but no change of dominant role of convective heat flux to the shape of the molten pool.read more
Citations
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Journal ArticleDOI
Powder Bed Fusion of nickel-based superalloys: A review
Salomé Sanchez,Peter Smith,Zhengkai Xu,Gabriele Gaspard,Gabriele Gaspard,Christopher J. Hyde,Wessel W. Wits,Ian Ashcroft,Hao Chen,Adam T. Clare +9 more
TL;DR: A comprehensive review of the microstructure and mechanical properties of nickel-based superalloys, manufactured using the two principle PBF techniques: Laser Powder Bed Fusion (LPBF) and Electron Beam Melting (EBM) is presented in this article.
Journal ArticleDOI
Effect of heat treatment on microstructure evolution of Inconel 718 alloy fabricated by selective laser melting
X. Li,J.J. Shi,C.H. Wang,Guanghui Cao,Alan M. Russell,Zhongjiao Zhou,Chang-Peng Li,Guofeng Chen +7 more
TL;DR: Inconel 718 superalloy was fabricated by selective laser melting (SLM) and subsequently subjected to different heat treatments as discussed by the authors, and the morphology, distribution and crystallography of precipitates and their formation mechanisms are discussed and analyzed.
Journal ArticleDOI
Selective laser melting of Ti6Al4V: Effect of laser re-melting
J. Karimi,C. Suryanarayana,I.V. Okulov,I.V. Okulov,Konda Gokuldoss Prashanth,Konda Gokuldoss Prashanth,Konda Gokuldoss Prashanth +6 more
TL;DR: A detailed and systematic study of the effect of remelting on the microstructure and mechanical properties of Ti6Al4V was undertaken in this paper, which showed that the number of remeltings played a significant role in determining the micro-structure (homogenization of the micro structure) and the mechanical properties.
Journal ArticleDOI
Numerical simulation of the impact of laying powder on selective laser melting single-pass formation
TL;DR: In this paper, the influence of powder size distribution and powder bed tightness on the performance of the SLM single-pass formation process is investigated, and the corresponding simulations are performed from three aspects: particle size distribution, powder bed tighterness, and lamination thickness.
Journal ArticleDOI
Microstructural evolution and mechanical performances of selective laser melting Inconel 718 from low to high laser power
TL;DR: In this paper, selective laser melting (SLM) technology was used to manufacture the Inconel 718 alloy from low to high power and the effects of laser power on formability, microstructural evolution and tensile performance were studied.
References
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Journal ArticleDOI
Laser additive manufacturing of metallic components: materials, processes and mechanisms
TL;DR: Additive manufacturing implies layer by layer shaping and consolidation of powder feedstock to arbitrary configurations, normally using a computer controlled laser as discussed by the authors, which is based on a novel materials incremental manufacturing philosophy.
Journal ArticleDOI
The status, challenges, and future of additive manufacturing in engineering
Wei Gao,Yunbo Zhang,Devarajan Ramanujan,Karthik Ramani,Yong Chen,Christopher B. Williams,Charlie C. L. Wang,Yung C. Shin,Song Zhang,Pablo D. Zavattieri +9 more
TL;DR: Future directions such as the "print-it-all" paradigm, that have the potential to re-imagine current research and spawn completely new avenues for exploration are pointed out.
Journal ArticleDOI
Microstructures and mechanical behavior of Inconel 718 fabricated by selective laser melting
Krista Amato,Sara M. Gaytan,Lawrence E Murr,E. Martinez,P. W. Shindo,Jennifer Hernandez,S. Collins,Francisco Medina +7 more
TL;DR: In this paper, the Inconel 718 cylinders were fabricated by selective laser melting in either argon or nitrogen gas from a pre-alloyed powder, and they exhibited columnar grains and arrays of oblate ellipsoidal precipitates oriented in a strong [2.0.0] texture determined by combined optical metallography, transmission electron microscopy, and X-ray diffraction analysis.
Journal ArticleDOI
Selective laser melting additive manufacturing of Inconel 718 superalloy parts: Densification, microstructure and properties
Qingbo Jia,Dongdong Gu +1 more
TL;DR: In this paper, a comprehensive study of densification behavior, microstructural features, microhardness, wear performance and high-temperature oxidation properties of Inconel 718 parts fabricated by selective laser melting (SLM), a typical additive manufacturing process was established.
Journal ArticleDOI
The microstructure and mechanical properties of deposited-IN718 by selective laser melting
TL;DR: In this paper, the starting material, manufacturing processes, heat treatment and characterization procedures of mechanical properties are presented, and the microstructure is crucial for the mechanical properties of IN718.
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