Papers by Keyword: Metal Powder

Abstract: This study explores the comparative analysis of mixed Aly718 (INCONEL) and H13 (tool steel metal) powders versus layered structures, both fabricated using the Directed Energy Deposition (DED) method in 3D printing. The investigation focuses on the macro and microstructural properties of 3D printed materials, the mechanical performance and potential applications of 3D printed materials.

Abstract: Selective laser melting (SLM) is one of the additive manufacturing technologies that allows us to produce complex shape metallic objects from powder feedstock. Al-alloys are very promising materials in selective laser melting. In this paper, atomized metal powders of various aluminum alloys are investigated: 1) deformable alloys АК4, АК6; 2) cast alloys АК9ph, АК12; 3) deformable hardened alloy D16. As a part of the work, the particle shape, particle size distribution and technical characteristics of the powders were investigated, and also the compliance of materials with the requirements of additive technologies (SLM) was determined.

Abstract: AlSi12 alloy is one of the most widely used materials in selective laser melting. Selective laser melting (SLM) of AlSi12 alloy has been well studied in recent years. Researchers typically use very expensive spherical powders atomized in an inert atmosphere. For this paper, we studied SLM of air-atomized non-spherical powder to determine its printability. Nine specimens were fabricated using different SLM process parameters. The lowest porosity that was achieved was 1.3%.

Abstract: This paper introduces the characteristics of sapphire and sapphire digging bits in LED field. The segment matrix design principle of bit and the rule of diamond selection are put forward. In addition, this paper analyzes the function of different metal powders and diamond parameters in the segment matrix. The results show that the finer grained (for example 80/100 mesh) diamond should be used with the concentrations of 30-60%. In the segment matrix, tin element can make the matrix more brittle and then the bit is sharper. Copper, silver and nickel element can enhance the matrix toughness and strength, cobalt and tungsten element can increase abrasive resistance. All of the above designs enable the sapphire bit to high sharpness and long life. A 4-inch sapphire bit was prepared for drilling sapphire crystal, the efficiency is increased by 8% than the Taiwan drill bit with the same specifications, the life is equal to Taiwan's drill bit, and the defect rate of sapphire bar is less than 0.5%, which satisfies the requirement of customers.

Abstract: Rina Consulting Centro Sviluppo Materiali (CSM) has been involved in the study and development of powder metallurgy for different applications, thanks to its participation in many research industrial and funded projects. The entire metal powder production chain takes place within the company's own researcher and facilities. This allows to produce high quality powders starting from alloy design, VIGA atomization and chemical, rheological and particle size analysis. In recent years, the development has mainly concerned manufacturing processes. Currently only a limited number of metal alloys can be processed by AM. For that reason, the alloy design becomes a really important topic to enlarge AM capabilities to other materials and applications. Starting from commercial Thermodynamic and Kinetic codes and proprietary models on solidification and micro-segregation, the alloy chemical composition can be fine-tuned to optimize the microstructure, considering the target properties of the material and the relevant AM processing windows, taking into account also the post process treatment conditions. Moreover, the knowledge of the production plants allows CSM to have a wide vision on the realization and the characterization of the metal powders focusing to achieve the best powder quality suitable for AM applications. Finally, AM is a relatively “new” process, standardization is still an ongoing activity involving several communities and organizations like ASTM, AWS and ISO; in this contest CSM has already designed the guidelines for qualification and certification processes and has created a dedicated laboratory to qualify powders of AM players.

Abstract: The 3D printed cubic bulk specimens (10x10x10 mm) were fabricated by Selective Laser Melting (SLM) additive manufacturing (AM) technology from TiAl6V4 powder, using different layer thickness (from 40 to 60 μm), for investigation of the influence of layer thickness on microstructure of SLM-fabricated TiAl6V4.

Abstract: Additive manufacturing (AM) technologies make it possible to produce complex shape metallic objects from powder feedstock. AlSi12 alloy is one of the most widely used materials in selective laser melting (SLM). The large number of technological parameters involved complicate the selection of an SLM mode for obtaining a product with the required structure. The goal of this research was to determine the mode which ensures the material’s low porosity. Nine specimens were fabricated by using different SLM process parameters. The fabricated specimens have different microstructures. The lowest porosity that was achieved is about 0.5%.

Abstract: In this work standard industrial processing equipment, the torque mixer and twin screw extruder, are used to measure the melt flow of several titanium metal powder feedstocks. The study was to determine whether test data from specialised rheology equipment might be reproduced with standard processing equipment used by the MIM industry.Considering the wide range of flow defects possible with MIM there is a valid assumption that flow behaviour measurement will be better represented by a number of processes, especially those most representative of the injection moulding process.In this study process data was collected and analysed based on mixing torque, screw work, specific mechanical energy and viscosity. Viscosity was further calculated relative to (L/D) ratio and strain rates during extrusion. Subsequently the data was compared with viscosity values from a capillary rheometer both without, and with, account for end effects and slip.The results showed that all the techniques provide similar ranking for the feedstocks with regard to melt flow during processing. The results also showed an inversion of the ranking where the shear rate increased from (1000 to 5000) s^-1 as a result of shear sensitivity. The agreement of results from the different techniques clearly show that conventional processing equipment may provide valid feedstock assessment. The results if not definitive will provide good comparative measure where upper and lower bounds can be determined.

Abstract: This paper is intended for the analysis of the fabrication of Thermoelectric Materials with emphasis on the use of Powder Technology including the use of Powder Technology. Main characteristics of them are considered. The recycling of thermoelectric material pieces is shown.

Abstract: In this article the technology “high-speed direct laser deposition” is performed. Influence of process parameters on product properties and material structure was defined for Ni-based alloy Inconel 625. Developed technology provided the mechanic properties of products on the bottom level of rolled metal and allows avoid heat treatment and HIP in production process. Economic efficiency of this technology is demonstrated for main areas of industry.