Journal ArticleDOI
Grain size evolution under different cooling rate in laser additive manufacturing of superalloy
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TLDR
In this paper, experiments were conducted to investigate the effects of processing parameters including scanning speed, laser power and powder feeding rate on grain size of the solidified track during laser metal deposition.Abstract:
The processing parameters in laser additive manufacturing have a crucial impact on solidification microstructure especially grain size, thus influencing the properties of the final products. In this paper, experiments were conducted to investigate the effects of processing parameters including scanning speed, laser power and powder feeding rate on grain size of the solidified track during laser metal deposition. A three-dimensional model considering heat transfer, phase change and Marangoni convection flow had also been developed to simulate the solidification parameters especially cooling rate (G × R) to illustrate the underlying mechanisms. The experimental and simulated results indicated that cooling rate increased and grain size decreased from 8.7 μm to 4.7 μm with the increase of scanning speed from 2 mm/s to 10 mm/s. Contrarily, cooling rate decreased and grain size increased with the increase of laser power and powder feeding rate. The numerical and experimental results provide the additive manufacturing process with the potential of microstructure control and performance optimization.read more
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Mechanical performance of 316 L stainless steel by hybrid directed energy deposition and thermal milling process
TL;DR: In this paper, a hybrid approach with direct energy deposition (DED) followed by a subtractive milling process within a single workstation is developed, which can directly produce internal and highly complex structural parts with ideal dimensional accuracy.
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Corrosion performance of additively manufactured stainless steel parts: A review
TL;DR: In this article, the performance of additively manufactured stainless steel parts made by LPBF and DLD is analyzed in comparison to their conventional counterparts. But, there are still controversies around some important aspects such as passive film structure, residual stress, post heat treatment processes, and grain size distribution and their impact on corrosion performance.
Journal ArticleDOI
Microstructure and fatigue behavior of a laser additive manufactured 12CrNi2 low alloy steel
TL;DR: In this paper, the mechanisms driving high cycle fatigue fracture of the as-built 12CrNi2 low alloy steel were investigated and a concurrent process-microstructure-property relationship was established through microstructural analysis.
Journal ArticleDOI
A review on metallurgical aspects of laser additive manufacturing (LAM): Stainless steels, nickel superalloys, and titanium alloys
TL;DR: In this paper , a review of the state of the art in 3D printing is presented and the gaps in the scientific understanding are underlined, which may limit the growth of LAM technology for the design of metallic parts.
References
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Journal ArticleDOI
Additive manufacturing of metallic components – Process, structure and properties
Tarasankar Debroy,Huiliang Wei,J.S. Zuback,T. Mukherjee,John W. Elmer,John O. Milewski,Allison M. Beese,Alexander E. Wilson-Heid,Amitava De,Wei Zhang +9 more
TL;DR: A review of the emerging research on additive manufacturing of metallic materials is provided in this article, which provides a comprehensive overview of the physical processes and the underlying science of metallurgical structure and properties of the deposited parts.
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
Enthalpy-porosity technique for modeling convection-diffusion phase change: application to the melting of a pure metal
TL;DR: In this article, the melting of pure gallium in a rectangular cavity has been numerically investigated using the enthalpy-porosity approach for modeling combined convection-diffusion phase change.