Selective laser melting slm updated thursday 8th march 2018. Guide to selective laser sintering sls 3d printing formlabs. Design optimisation for selective laser melting slm and experimental testing of an aircraft component luis miguel rodeia seabra thesis to obtain the master of science degree in. All books are in clear copy here, and all files are secure so dont worry about it.
Download selective laser melting additive manufacturing of hardto book pdf free download link or read online here in pdf. Part of the industrial engineering commons recommended citation zeng, kai, optimization of support structures for selective laser melting. Selective laser melting pure tungsten microstructure compressive strength wear resistance abstract due to the intrinsic properties of tungsten, such as high melting point and high thermal conductivity, selective laser melting of pure w parts experiences many challenges. Selective laser melting of aluminium components sciencedirect. Jul 28, 2017 the selective laser melting process results in very rugged, precisionmanufactured objects. Selective laser melting slm is a particular rapid prototyping, 3d printing, or additive manufacturing am technique designed to use high powerdensity laser to melt and fuse metallic powders. B sercombe and xiaopeng li the university of western australia, school of mechanical and chemical engineering, perth, wa.
Ansys discovery spaceclaim facilitates the processing of existing stl data. Additive manufacturing of metal parts is set to revolutionize how many things are made. Selective laser melting slm on the other hand is a manufacturing method perfectly suited to produce highly complex parts in small or even individualized batches 2. Direct metal laser sintering 3d selective laser melting. Material is added layer by layer by lowering the build by a small amount and spreading a thin layer of powder over the surface. Selective laser melting of aluminium and aluminium metal matrix composites. The unmelted material is then removed after the build process and can be reused. Economic comparison of selective laser melting and. This metal sintering or melting process fuses the powder together and creates a solid form. Additive manufacturing of high selective laser melting slm. Selective laser melting uses a laser to melt successive layers of metallic powder.
What is selective laser melting selective laser melting slm is a method of applying additive processes to metal, and is also sometimes referred to as powder bed fusion. Effect of heat treatment of 316l stainless steel produced by. Capabilities and performances of the selective laser melting process 235 in order to reach a high density, the metallic powder particles are fully molten, laser melting process is accompanied by the development of residual stresses, that derive from high thermal gradients in the material. Cantilever beams manufactured in this way have been twoway trained and actuated by ohmic heating demonstrating the suitability of the process for applications in microelectromechanical technologies. Surface morphology in selective laser melting of metal. The selective laser melting slm is a technology that can manufacture 3d components by laser beam action that completely melts a powder bed layer until the final geometry. Dec 24, 2019 subsequently, this cad file was used as the input for an engineered object, which was manufactured by applying an additive manufacturing technique 3d selective laser melting, slm and using. Selective laser melting is also known as direct melt laser melting or laser bed fusion. Selective laser melting slm is a particular rapid prototyping, 3d printing, or additive manufacturing am technique designed to use a high powerdensity laser to melt and fuse metallic powders together. Guide to selective laser sintering sls 3d printing. Materials science and engineering c 62 2016 852859. Inprocess sensing in selective laser melting slm additive manufacturing thomas g. The helix scan strategy applied to the selective laser melting.
Capabilities and performances of the selective laser. Read online selective laser melting additive manufacturing of hardto book pdf free download link book now. Slm processing leads to the evolution of numerous microstructural features strongly affecting the mechanical properties. New optical schemes for selective laser melting systems provide more consistent control of laser processing conditions. Also explore the seminar topics paper on selective laser sintering with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year mechanical engineering me or production automobile students for the year 2019 2020.
The selective laser melting slm technique is an outstanding new production technology that allows for timeefficient fabrication of highly complex components from various metals. This procedure continues layer by layer until the desired component is completely manufactured. In this paper, we performed molecular dynamics simulation to investigate the selective laser heating process of cu powders. Optimization of support structures for selective laser melting. The author at said it best when they noted that it involved a tortuous marketing path. Selective laser melting on the other hand has had an odd, confusing, and painful history. Selective laser melting slm, which is 3d printing technology dedicated for metals and their alloys 11, has drawn attention as a suitable method for processing of amorphous alloys due to the. The laser sintering process is characterised by extreme rapid. A solid state laser melts fine metallic powder according to the cad two dimensional image of each layer. The relationship between the slm process parameters and the microstructure of titanium alloys has been the object of several works, but the texture formation during the slm process has yet to be understood. Selective laser melting slm additive manufacturing am of hardtoprocess wbased parts with the addition of 2. Slm selective laser melting is in an additive manufacturing method specially developed for 3d printing metal alloys. Since the midnineties, fraunhofer ilt has been developing the selective laser melting process slm.
In order to optimise the manufacture and reduce the deformation of manufactured metal layers, helix scan strategy and progressive scan. Focusing on laser melting performance pdf file size. Selective laser melting slm, which is 3d printing technology dedicated for metals and their alloys 11, has drawn attention as a suitable method. Novel tibased nanocomposites by selective laser melting slm additive. Selective laser melting of aluminium and aluminium metal. The slm 125 selective laser melting machine offers a compact build envelope designed for costefficient process development and small to medium lot production of highquality, fully dense metal parts. The high laser power is a significant problem as it is higher than that used in many slm machines. Introduction of slm process selective laser melting slm is one of. Selective laser sintering seminar report, ppt, pdf for. Selective laser sintering sls is an additive manufacturing technology developed under sponsorship by the defense advanced research projects agency darpa and acquired in 2001 by 3d systems.
Introduction of slm process selective laser melting slm is one of the new additive manufacturing techniques that emerged in the late 1980s and 1990s. Selective laser melting slm is an additive manufacturing process which locally melts a metallic powder bed using a highly focus laser beam. Surface morphology in selective laser melting of metal powders. The slm technique is also commonly known as direct selective laser sintering, lasercusing, and direct metal.
Selective laser melting of metal powders studied by. The temperature gradient and the solidification velocity were first calculated from a finite. Compared to laser engineered net shape lens, selective laser melting slm has the benefit of more easily creating a high quality local inert atmosphere which protects chemicallyreactive nitinol powders to a higher degree. Study on the formability, microstructures and mechanical properties of alcrcufenix highentropy alloys prepared by selective laser melting shuncun luo, zemin wang, xiaoyan zeng wuhan national laboratory for optoelectronics, huazhong university of science and. Additive manufacturing of high selective laser melting. The process is very similar to sls process but the energy of the beam is much higher and the process is performed under controlled atmosphere. A typical sls or slm process is illustrated in fig. Pdf parametric analysis of the selective laser melting. Selective laser melting slm is a powder bed am technology in which parts are fabricated layer by layer using the action of a highenergy beam on a powder bed. Much like other forms of 3d printing, a printable file and settings are selected for print.
Pdf selective laser melting slm is a particular rapid prototyping, 3d printing, or additive manufacturing am technique designed to use. Pdf microstructure simulations of inconel 718 during. Process development for selective laser melting brochure. Selective laser melting slm is an additive manufacturing technique that selectively melts successive layers of metal powder using a laser. Laser additive manufacturing of highperformance materials. The resulting crosssections are stored sequentially in a build file. Selective laser melting slm and electron beam selective melting ebsm are powder based additive manufacturing technology, which utilize a focused electron beam laser beam to melt and fuse metal powder by rapid selfcooling, and produce parts layer by layer with high accuracy. Selective laser melting has been used to build high aspect ratio, threedimensional niti microelectromechanical components. Selective laser melting offers the unrivalled design freedom for the fabrication of metallic components. The microstructure of alsi10mg created by selective laser melting slm.
Laser sintering, which means, methods that helps in the manufacturing of solid parts by solidifying powder like materials layerbylayer, exposing the surface of a powder bed with a laser or other high energy beam. Selective laser melting slm slm starts with a cad model of the part that is sliced at discrete intervals in the build direction. The 400w fiber laser is the highest laser power in its class and replicates production settings with up to 80% less metal powder than other systems. Traditional slm machines have a maximum laser power of 400 w with laser focus diameter of 100. Selective laser sintering sls is an additive manufacturing am technique that uses a laser as the power source to sinter powdered material typically nylon or polyamide, aiming the laser automatically at points in space defined by a 3d model, binding the material together to create a solid structure. In many slm is considered to be a subcategory of selective laser sintering sls. The sls process employs a high power laser to fuse plastic powders layer by layer into finished prototypes and functional enduse components. Selective laser melting slm is a powderbased additive manufacturing capable to produce parts layerbylayer from a 3d. The laser heat input was modelled by an internal heat source, as was demonstrated by kossolov et al. Selective laser melting of high aspect ratio 3d nickel. Kai zeng university of louisville follow this and additional works at. Electron beam melting ebm jump to brief overview ebm is an alternate additive metal process in comparison to dmls, and is a perfect solution for large parts built using ti6ai4v. Selective laser melting slm is a specific 3d printing technique, which utilizes high powerdensity laser to fully melt and fuse metallic powders to produce near netshape parts with near full density up to 99.
In this work the selective laser melting slm of pure copper powder was studied. Selective laser melting additive manufacturing of pure. Sls 3d printing has been a popular choice for engineers in product development for decades. Sls is reactive when using a chemical reaction of mixing components in the presence of a laser and a selective laser melting slm, a direct metal laser sintering dmls or direct metal laser remelting, when the complete melting of powders is pervasive over the solid state dust sintering. But the second beams power should be limited to prevent evaporation of material. Selective laser melting slm, also known as direct metal laser melting dmlm or laser. Selective laser melting slm openlearn open university. Selective laser melting can be used to build up 3d metal parts by melting metallic powders together. Cu atoms were heated up by a mobile laser beam and subsequently cooled down by a nibase plate underneath them. Nuno manuel fernandes alves cdrspipl examination committee.
Advances in selective laser melting of nitinol shape. Introduction of slm process university of birmingham. Dynamic beam focusing offers new possibilities for tighter focus control across the build plate and in varying. A component is built by selectively melting and fusing powders within and between layers. The laser scanning strategy determined the deformation magnitude and the shape residual stress profiles. Selective laser melting the additive manufacturing technology selective laser melting makes it possibility to manufacture metal components layer by layer according to a 3dcad volume model. Selective laser melting for medical implants brochure. On the texture formation of selective laser melted ti6al. Selective laser melting slm is a part of additive manufacturing where a highpowerdensity laser is used to melt and fuse metallic powders together. Therefore the power of the first laser is to 200w to be sure that the energy amount set is high enough for melting. Selective laser melting additive manufacturing of hardto. In situ elaboration of a binary ti26nb alloy by selective laser melting of elemental titanium and niobium mixed powders. Selective laser melting slm of a high strength low alloy steel hy100 is considered in the present investigation.
Selective laser melting slm is one of the new additive manufacturing techniques that emerged in the late 1980s and 1990s. Pdf selective laser melting of copper researchgate. Selective laser melting slm is a method of applying additive processes to metal, and is also sometimes referred to as powder bed fusion. Previous work has shown that the processing of aluminium alloys by selective laser melting slm is difficult, with reasonable components only being produced with high laser powers minimum 150 w and slow laser scanning speeds. Selective laser melting machine slm solutions na, inc. Design optimisation for selective laser melting slm and. Selective laser melting really proves its worth when complex components need to be produced in a short time. This book entitled laser additive manufacturing of highperformance materials. Selective laser melting slm is an additive manufacturing technique which allows producing threedimensional metallic parts from powder material, using a. Msolutions laser sintering system eosint m 280 for the production of tooling inserts, prototype parts and end products directly in metal pdf.
Nov 10, 2014 selective laser melting and the patent rights monopoly. The selective laser melting slm process is based on spreading a layer of metal powder onto a platform and laser melting of a predefined slice pattern from the cad file to the layer below it. Selective laser melting an overview sciencedirect topics. Using discovery spaceclaim, we were able to build a coil heat exchanger that can be manufactured without support geometries. To many slm is considered to be a subcategory of selective laser sintering sls. Pdf in situ tisi intermetallicbased composites by selective laser melting. When the powder to be fused is metal, the terms direct metal laser sintering dmls and direct metal laser melting dmlm are commonly used. Selective laser melting for medical implants brochure selective laser melting for medical implants if individually adapted bone and joint replacements or medical implants had greater functionality, e. Abstract this work presents an investigation into the selective laser melting slm of 24 carat gold au powder with a mean particle size of 24. Selective laser melting slm is a powderbased additive manufacturing capable to produce parts layerbylayer from a 3d cad model. Sls is reactive when using a chemical reaction of mixing components in the presence of a laser and a selective laser melting slm, a direct metal laser sintering dmls or direct metal laser re melting, when the complete melting of. Selective laser melting of metal powders studied by molecular.
Because of low laser radiation absorption and high thermal conductivity it is very difficult to organize stable. Inprocess sensing in selective laser melting slm additive. The selective laser melting process results in very rugged, precisionmanufactured objects. Owing to the high heating and cooling rate 10 3 10 8 ks involved in the slm process 5, which tends to enhance the nucleation rate and suppress grain growth, the mechanical properties of metals produced via slm are typically improved. Capabilities and performances of the selective laser melting. Process information with the selective laser melting three dimensional parts can be generated in a layer building process. The laser used for experiments has a gaussian power density distribution. The am250 is a laser melting machine used for additive manufacturing and capable of producing fully dense metal parts direct from 3d cad. Jan 22, 2012 in selective laser melting processing, the residual stress will occur inside the melted layer inevitably, and the deformation will be made simultaneously. Pdf this study concerns the interaction of the powerful laser radiation 0. During the slm process, a product is formed by selectively melting successive layers of powder by the interaction of a laser beam. It creates parts additively by fusing metal powder particles together in a full melting process. Moreover, it has been consistently advancing the entire slm process chain in order to qualify the process for use in industrial production and to integrate it in existing production environments.
The current work describes i optimization of slm process parameters for. Journal preproof selective laser melting of nickel aluminium bronze timothy murrayconceptualisation methodology investigation writing origina. Heat is generated using a focused heat source, normally a laser, sufficient to melt a thin layer of powder applied to the surface of a substrate. Thereby, slm enables the production of nearly unlimited complex geometries without the need of partspecific tooling or preproduction costs 4. An slm 100 system was used which is intended for production of highly detailed and intricate parts. Scanning algorithms are devised to plan the path of the laser beam. Parametric analysis of the selective laser melting process. Fabrication and characterization of ti6al4v by selective. Selective laser melting slm has been shown to be an attractive manufacturing route for the production of. Selective laser melting selective laser melting slm process, as demonstrated in is an additive figure 2, manufacturing process whereby metallic powder particles are fused together with the energy of a focused laser beam by selectively scanning a powder bed layer by layer in a successive way to create 3d objects from cad model 5. The slm process uses data from a 3d cad file and transfers the sliced data to a. Alcrcufenix highentropy alloys prepared by selective. The laser will heat particles in specified places on a bed of metallic powder until completely melted. Explore selective laser sintering with free download of seminar report and ppt in pdf and doc format.
There are several efforts on fabrication of ceramic materials directly without any sintering or postprocessing using. Selective laser melting slm is one of the premier technologies, but how does it work. This is a fast developing process that is being implemented in both research and industry. Understanding adopting selective laser melting of metallic. On the fatigue properties of metals manufactured by selective. In this study, the microstructure evolution of the inconel 718 alloy fabricated by selective laser melting slm was investigated by a phase field model. Summary of work done in the field of selective laser melting of al alloys in different focus areas, by reference number. The selective laser sintering process and applications. Laser additive manufacturing as a key enabler for the. In this process, the powders are fully melted and solidified. Selective laser melting of nickel aluminium bronze pdf free. Selective laser melting, additive manufacturing, 316l, heat treatment.
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