- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Process planning guidelines in selective laser melting for the manufacturing of stainless steel parts
摘要： Selective laser melting (SLM) is now, one of the most widespread Additive Manufacturing processes, due to presence in the market and known capabilities for the fabrication of mechanical components, with acceptable levels in geometrical accuracy, surface quality and mechanical properties. However, the metalworking industry is still skeptical for its full adoption in realistic production schemes, because of the lack of non-scholarly knowledge for calibrating process parameters among other technical barriers. In this work, several process planning guidelines are presented as a result of a SLM process calibration for a selected material (stainless steel 316L), with the intention of contributing in process parameters selection in net shape manufacturing. In order to conceive a proper set of guidelines for selective laser melting set up, several parameters were taken into account such as point distance, hatch distance, exposure time among others, with the aim of obtaining appropriate surface quality and good mechanical tensile behavior. Parts were obtained with good surface quality, presenting stable and well-defined weld lines and low presence of partially sintered particles adhered to the surface. After the application of the methodology, top and lateral surface roughness were improved, reaching values of Ra 5.81 and 9.61 μm respectively. In addition, good mechanical properties were obtained, of up to 500 MPa of ultimate tensile strength and 400 MPa of yield stress, comparable to the properties of sintered stainless steels alloys studied in previous works.
关键词： powder bed laser melting,roughness,surface quality,process planning,selective laser melting
更新于2025-09-12 10:27:22
-
Powder Bed Based Laser Additive Manufacturing Process of Stainless Steel: A Review
摘要： This study presents a review on powder bed laser additive manufacturing of stainless steel. The powder bed laser additive manufacturing processes that are presented in this paper are the selective laser sintering and selective laser melting. The powder bed laser additive manufacturing process of stainless steel are reviewed in this paper. The process parameters was found to plat an important role in the evolving properties of the powder bed based laser additive manufacturing process. The paper ends with the perspective of future research directions.
关键词： Materials characterization,laser additive manufacturing,selective laser sintering,Additive manufacturing,selective laser melting
更新于2025-09-12 10:27:22
-
Laser additive manufacturing of oxide dispersion strengthened steels using laser-generated nanoparticle-metal composite powders
摘要： A new route for the synthesis of powder composites suitable for processing with laser additive manufacturing is demonstrated. The powder composites, consisting of micrometer-sized stainless steel powder, homogenously decorated with nano-scaled Y2O3 powder particles, are manufactured by laser processing of colloids and electrostatic deposition. Consolidated by laser metal deposition and selective laser melting, the resulting specimens show superior mechanical properties at elevated temperatures, caused by the nano-sized, homogenously distributed dispersoids.
关键词： Laser additive manufacturing,Pulsed laser ablation in liquids,Selective Laser Melting,Oxide dispersion strengthened materials,ODS
更新于2025-09-12 10:27:22
-
Laser welding of AlSi10Mg aluminium-based alloy produced by Selective Laser Melting (SLM)
摘要： Additive manufacturing can produce very complex and highly integrated parts that cannot be manufactured by traditional methods. In many of its applications, the AM-manufactured part may be a very small part of the whole, and therefore it has become increasingly important to find suitable attachment methods for printed parts. The aim of this study was to find out the laser weldability of the printed AlSi10Mg material without filler material. The laser used in these welding experiments was Yb:YAG disk laser. The laser wavelength was 1030 nm and the maximum output power on the workpiece surface was 4 kW. AlSi10Mg is a widely used material in parts that are produced utilizing the SLM technique. The material has very good corrosion resistance properties, good electrical conductivity and excellent thermal conductivity. AlSi10Mg has proven to be much easier to print than steel materials, so it is a popular material also in prototype production. Based on welding tests, laser welding without filler material is suitable for AlSi10Mg material and the static strength of the weld is reasonably good compared to the base material. However, AlSi10Mg can be found to be challenging due to its composition.
关键词： Selective Laser Melting (SLM),AlSi10Mg,Yb:YAG disk laser,Laser welding,Additive Manufacturing (AM)
更新于2025-09-12 10:27:22
-
[IEEE 2019 IEEE 15th International Conference on Automation Science and Engineering (CASE) - Vancouver, BC, Canada (2019.8.22-2019.8.26)] 2019 IEEE 15th International Conference on Automation Science and Engineering (CASE) - Iterative learning control for power profile shaping in selective laser melting
摘要： Selective laser melting (SLM) can be used to manufacture functional metal parts with complex geometries that cannot be produced by traditional manufacturing methods. However, SLM process control cannot yet guarantee the end part quality required for critical applications. The application of model-based control strategies to SLM is complicated by both the closed architecture of industrial SLM machines and the lack of suitable control-oriented process models. In this paper we (1) present an open-source SLM printer that allows implementation of the on-the-fly power adjustment and (2) use a data-driven method, iterative learning control (ILC) to learn the suitable laser power profile using the melt pool emission measurements from a coaxial camera. We demonstrate the effectiveness of the proposed ILC approach through experiments on the open-source SLM machine.
关键词： iterative learning control,laser power profile,open-source SLM printer,Selective laser melting,melt pool emission measurements
更新于2025-09-12 10:27:22
-
Multi-physical analysis of thermo-optical effects for different Selective Laser Melting (SLM) scanning strategies
摘要： In this paper, transient thermo-optical effects in protective windows for selective laser melting are analyzed by means of a multi-physical analysis. The temperature distribution of the window is simulated for different scanning strategies and orders of exposure. Therefore, cubic test specimens are virtually built and the resulting axial and lateral focus shift is analyzed. Furthermore, the impact of the distance between the laser scanner and the protective window is analyzed. The simulations predict that spreading the thermal load on the window both spatially and temporally reduces the focus shift. Consequently, the focus shift is reduced if the window is placed further away from the laser scanner.
关键词： thermal lensing,Selective laser melting,protective window,finite element analysis,laser-powder bed fusion,additive manufacturing
更新于2025-09-12 10:27:22
-
In-situ characterization of tungsten microcracking in Selective Laser Melting
摘要： Additive Manufacturing is a promising way of processing tungsten, with opportunities to create more complex parts than are possible using other powder metallurgical routes. This may lead to extended applications such as collimators, in fusion reactors, or in other structurally loaded, high temperature environments. The poor thermal shock resistance and ductile-to-brittle transition that occurs in tungsten above room temperature are challenges that hinder production of fully dense and crack free parts. This research employs high speed in-situ monitoring of Selective Laser Melting of single tracks to visualize crack initiation and propagation. The circumstances that lead to cracking are correlated with microstructural morphology and processing conditions.
关键词： In-situ monitoring,Additive Manufacturing,Microcracking,Laser powder bed fusion,Tungsten,Selective Laser Melting
更新于2025-09-12 10:27:22
-
Disk Laser Assisted Surface Heat Treatments Of AlSi10Mg Parts Produced By Selective Laser Melting (SLM)
摘要： Metal parts produced with the Selective Laser Melting (SLM) method have a great variety of uses today and because of this the requirements on the surface quality differ between applications. The surface treatments of the printed metal pieces, like other finishing phases, are often still manually worked on and thus are very time-consuming processes. This study focuses on the SLM printed AlSi10Mg aluminium specimen’s surface laser heat treatment with disk laser equipment (wavelength of 1030nm). The goal of this study was to achieve the desired effect on the aluminium’s surface quality with robotized laser heat treatment equipment. This was to show that the used finishing treatment method could be automated or robotized. The study showed that with the correct laser parameters, it is possible to generate desired effects and features on to the AlSi10Mg aluminium piece’s surface with a robotized process.
关键词： Selective Laser Melting (SLM),laser forming,AlSi10Mg,Additive Manufacturing (AM)
更新于2025-09-12 10:27:22
-
Selective laser beam melting of polymers: In situ and offline measurements for process adapted thermal characterization
摘要： Selective laser beam melting of polymers has to overcome the borders between pure prototype construction and the manufacturing of serial parts. Therefore, a high level of reproducibility of the generated components must be ensured. Up to now, the thermal history of a component during selective laser beam melting is unknown. Neither the temperature during exposure of one layer nor the temperature development in z- or build direction is detected or even regulated. Therefore, in this study the temperature during laser exposure will be detected in a dual approach. The fundamental material beam interaction will be analyzed with a specific test set up, the so-called Laser-HS-DSC. This allows the detection of material beam interactions in combination with a commercial DSC experiment to analyze whether degradation occurs or not. With in situ infrared measurements in a selective laser beam melting system the maximum temperature during laser exposure can be measured. Finally, the offline Laser-HS-DSC experiments are compared to resulting maximum temperatures during exposure in a selective laser beam melting system. The same tendencies of maximum temperatures with varying energy input are obtained, whereas the maximum levels differ due to the different amount of exposed particles.
关键词： PA12,thermography,Additive manufacturing,process-oriented thermal analysis,process characterization,laser-flash DSC,selective laser melting
更新于2025-09-12 10:27:22
-
Characterization of Laser Spatter and Condensate Generated during the Selective Laser Melting of 304L Stainless Steel Powder
摘要： The selective laser melting process, commonly referred to as laser powder-bed fusion (L-PBF), is an Additive Manufacturing (AM) technique that uses a laser to fuse successive layers of powder into near fully dense components. Due to the large energy input from the laser during processing, vaporization causes instabilities in the melt pool leading to the formation of laser spatter and condensate, collectively known as heat-affected powder. Since heat-affected powder settles into the powder bed, the properties of the unconsolidated powder may be altered compromising its reusability. In this study, characterization of 304L heat-affected powder was performed through particle size and shape distribution measurements, energy-dispersive spectroscopy, Raman spectroscopy, inert gas fusion, metallography, and x-ray diffraction. The results show morphological, chemical, and microstructural differences between the virgin powder and heat-affected powder formed during processing which aid in the understanding of laser spatter and condensate that form in the L-PBF process.
关键词： condensate,powder characterization,laser spatter,selective laser melting
更新于2025-09-12 10:27:22