- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Effect of Selective Laser Melting Process Parameters and Heat Treatment on Microstructure and Properties of Titanium Alloys Produced from Elemental Powders
摘要： This work investigates Selective Laser Melting (SLM) process as a method of in-situ synthesis of Ti-5Al and Ti-6Al-4V alloys using elemental powder mixture. Elemental spherical powders were used to prepare a powder mixture and the samples were produced by SLM process using different volume energy densities. The effects of volume energy density on the samples’ relative density, chemical composition, microstructure and microhardness before and after heat treatment have been studied. It was shown that volume energy density significantly effects the density and microstructure of Ti-5Al and Ti-6Al-4V alloys, as well as, the microhardness of obtained Ti-6Al-4V.
关键词： additive manufacturing,in-situ synthesis,titanium alloy,powder bed fusion,elemental powders
更新于2025-09-16 10:30:52
-
Characterisation of 17-4PH metallic powder recycling to optimise the performance of the selective laser melting process
摘要： The advantages of Additive Manufacturing (AM) processes are well known. Particularly, those AM techniques which are used to manufacture metallic parts are of great interest to industry due to the good mechanical behaviour of metallic alloys. Despite this, the quality of the manufactured parts is still an important issue due to the wide range of parameters that can affect them. In some powder bed fusion techniques, such as Selective Laser Melting (SLM), not all the initially distributed metallic powder is used in the process. There is an unmolten portion that can be recycled to ensure both the economic and environmental viability of the process. Even though this powder is unmolten, it is thermally affected due to the high temperatures attained during the process. This fact affects the powder properties and, consequently, the properties of the manufactured parts. Therefore, an analysis of the recycling effects of SLM metallic powders is an important issue in order to establish good recycling procedures and to optimise the process performance.
关键词： Additive manufacturing,17-4PH stainless steel,Powder bed fusion,Selective laser melting,Laser beam melting
更新于2025-09-16 10:30:52
-
Fabrication of Carbon-decorated Al<sub>2</sub>O<sub>3</sub> Composite Powders using Cellulose Nanofiber for Selective Laser Sintering
摘要： In this study, systematic investigation using cellulose nanofiber (CellNF) as a carbon source for selective laser sintering (SLS) of Al2O3 was conducted. A composite powder that consisted of CellNF and Al2O3 was fabricated using electrostatic adsorption (EA) method in aqueous suspension. Heat-treatment temperature of 500 and 800°C was compared for the conversion of CellNF to carbon residue (CR) in the Al2O3 composite. After that, the parameters involving the volume fraction of CR and effect of Al2O3 particle size in the CR-Al2O3 composite particle were also investigated in order to obtain an optimized condition of the CR-Al2O3 composite particle for SLS. From the results obtained, 1.5 wt% CR-Al2O3 with alumina size of 0.8 μm that was heat-treated at 800°C exhibited optimum laser sinter ability owing to the good CR distribution over a higher surface area that promoted good laser adsorption for the alumina sintering.
关键词： additive manufacturing,nano-assembly technique,selective laser sintering,cellulose nanofiber,electrostatic adsorption
更新于2025-09-16 10:30:52
-
Development of a flexible low laser power hybrid (LLPH) technology for shipbuilding including additive manufacturedsemi-automated hand-held unit
摘要： A novel Low Laser Power Hybrid (LLPH) technology overcomes manufacturing gaps between 2D panels and 3D sections in shipbuilding. Construction, process, equipment and additive manufacturing knowledge are combined in the project “ShipLight”. This paper highlights part conditions, requirements for process and safety issues plus the new automated and semi-automated hand-held unit. Geometrical studies on shipbuilding material reveal dependencies between gap width, weld speed, and energy input per unit length as well as camera-based joint recognition with quality assurance aspects and weld seam calculation resulting in the adaption of welding parameters under field conditions. The last part briefly sketches the development of the semi-automated hand-held unit. Additive manufacturing is utilized in part mock-up studies and prototyping. An outlook is given on further upcoming applications.
关键词： Low Laser Power Hybrid (LLPH) Technology,Shipbuilding,Optical Seam Tracking,Texture-based Image Processing,Laser Hybrid Welding,Additive Manufacturing,Semi-automated Hand-held Unit
更新于2025-09-16 10:30:52
-
Test Results for Wrought and AM In718 Treated by Shot Peening and Laser Peening Plus Thermal Microstructure Engineering
摘要： Fatigue life improvement by shot peening (SP) and laser peening (LP) on metals is already well known. However, we are short of information about results on manufacturing (AM) parts, which are characterized by bad surface finishing, micro-porosities and structural defects. This paperstudies the effects of SP and LP on AM In718. Residual stress profiles, fractures surface, fatigue results will be detailed. Different thermal microstructure and surface preparations are compared: raw AM, SP, LP, polished.
关键词： Fatigue,Thermal,Shot Peening,Additive Manufacturing,Laser Peening
更新于2025-09-16 10:30:52
-
Control of Deviations in Lattice Structures Manufactured by Selective Laser Melting
摘要： The paper presents the study of lattice structures and deviations in them caused by the phenomena of the selective laser melting. Experimental samples were compared with their computer models and deviations were assessed. The most accurate control method for this material was determined and relative density was calculated from the results of the method.
关键词： Additive manufacturing,3D Scanning,Deviation Control,Selective Laser Melting,Lattice structures
更新于2025-09-16 10:30:52
-
Additive Manufacturing of Functionally Graded Metallic Materials Using Laser Metal Deposition
摘要： Functionally graded materials (FGMs) have attracted much research interest in the industry due to their graded material properties, which result from gradually distributed compositions or structures. In recent years, metallic FGMs have been widely studied, and additive manufacturing (AM) has become an important approach to build metallic FGMs. This paper aims to provide an overview of the research progress in metallic FGMs fabricated by laser metal deposition (LMD), an AM process that is widely used in metallic materials. Firstly, the unique material properties and advantages of FGMs are introduced. Then, typical recent findings in transition path design, fabrication, and characterization for different types of metallic FGMs via LMD are summarized and discussed. Finally, challenges in fabricating metallic FGMs via LMD are discussed, and other related aspects in the area of FGMs such as model representation and numerical simulation are proposed for further investigation.
关键词： Laser Metal Deposition,Intermediate Section,Transition Path,Metal Additive Manufacturing,Material Characterization,Functionally Graded Materials
更新于2025-09-16 10:30:52
-
Thermo mechanical analyses and characterizations of TiNiCu shape memory alloy structures developed by laser additive manufacturing
摘要： Three di?erent compositions of TiNiCu (Ti50Ni (50?x) Cux (x = 10, 20 and 30)) shape memory alloys (SMA) were developed using an intelligent manufacturing technique of laser additive manufacturing (LAM). Based on a numerical analysis the nature and amount of residual stress ?ow was predicted. By implementing ?nite element method (FEM) with Gaussian distributed volumetric heat source, the deposition process was simulated. The numerical and experimental analyses were at par with each other. The developed samples were subjected to several characterizations in order to determine the best among them. Scanning electron microscopy (SEM), atomic force microscopy (AFM), were used to study the surface morphology of the samples. The mechanical properties were studied using micro-hardness test and compression test. X-Ray di?raction (XRD) was deployed to investigate the crystalline nature of the samples. The phase transformation ability of the samples were determined by di?erential scanning calorimetry (DSC). The SEM revealed the deposition of all three samples to be homogeneous. The AFM results showed the grain size of TiNiCu10 to be 20.12 nm, the smallest among the samples. The micro-hardness and ultimate strength of TiNiCu10 was found to be 242 VHN and MPa respectively. XRD reveals the presence of three step transformation for TiNiCu20 sample. From the results, LAM process was considered as a successful methodology in developing TiNiCu bulk SMA structures. The properties of laser additive manufactured TiNiCu10 was found to be the best among the developed samples.
关键词： DSC,TiNiCu,SEM,XRD,Laser additive manufacturing,Shape memory alloy
更新于2025-09-16 10:30:52
-
Application of Laser Metal Deposition for a New Model of Assembled Camshaft
摘要： This work introduces the invention of an alternative camshaft manufacturing method aimed at improving the efficiency of the process and providing a more flexible product. The innovation consists in the laser metal deposition (LMD) of a profile on the shaft in order to realize a coupling stretch where the cam is fixed by interference. Alternative profile materials (1.4404 steel and Inconel 625 alloy) are deposited on a 1.0421 steel tube at different laser power levels and powder flow rate. The effect of the process parameters on the deposited profile is investigated initially through the evaluation of indirect quality attributes, such as deposit dimensions, hardness values, and microstructure. Then, the coupling force resulting from the press-fit test is evaluated. Finally, the best configuration of this new assembled camshaft is tested with a torsion test rig. Performances of the new assembled camshaft are compared with those of traditional products, leading to the validation of this innovative solution. The preliminary feasibility of the LMD application to the production of an assembled camshaft is demonstrated.
关键词： additive manufacturing,cladding,hardness,testing,laser metal deposition (LMD),dilution
更新于2025-09-16 10:30:52
-
A Review on Laser Powder Bed Fusion of Inconel 625 Nickel-Based Alloy
摘要： The Inconel 625 (IN625) superalloy has a high strength, excellent fatigue, and creep resistance under high-temperature and high-pressure conditions, and is one of the critical materials used for manufacturing high-temperature bearing parts of aeroengines. However, the poor workability of IN625 alloy prevents IN625 superalloy to be used in wider applications, especially in applications requiring high geometrical complexity. Laser powder bed fusion (LPBF) is a powerful additive manufacturing process which can produce metal parts with high geometrical complexity and freedom. This paper reviews the studies that have been done on LPBF of IN625 focusing on the microstructure, mechanical properties, the development of residual stresses, and the mechanism of defect formation. Mechanical properties such as microhardness, tensile properties, and fatigue properties reported by di?erent researchers are systematically summarized and analyzed. Finally, the remaining issues and suggestions on future research on LPBF of IN625 alloy parts are put forward.
关键词： additive manufacturing,heat treatment,Inconel 625,laser powder bed fusion,mechanical properties
更新于2025-09-16 10:30:52