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12) TESIMAGV, valuable know-how

14) 25th POLIGEM anniversary. A singular trait d'union between an intense past and a surprising future

30) Grinding of aerospace materials used for high-temperature applications

Abstract: Many aerospace components used in the high and low pressure sections of a turbine engine are made from materials such as high nickel-based super alloys, intermetallics such as gamma titanium aluminide and ceramic matrix composites. These components that may be cast, forged or sintered using powder metallurgy techniques, are notorious for being difficult to machine due to their high strength, toughness, corrosion and fatigue resistance, and low thermal conductivity. Many of these parts have as much as two-thirds of their original weight removed to produce the finished component. Traditionally turning, milling and broaching processes are employed to remove most or all of the material from these components. However, with the use of modern grinding wheels composed of engineered grains and high strength bond technology, grinding can now remove the material more quickly and economically than turning or milling. This paper will show data/results of surface grinding and creep feed grinding tests conducted on advanced aerospace engine materials specifically gamma titanium aluminide, IN718 using both conventional and superabrasive grinding wheels. It will also compare the grinding of ceramic matrix composites with that of monolithic ceramics.

49) Electropolishing in ecofriendly solution of Ti6Al4V parts produced by Electron Beam Melting

Abstract: The additive manufacturing process is gaining increasing interest due to the possibility of producing components with a complex shape, very close to the final geometry. On the other hand, however, it involves a very high final roughness, such as to compromise the mechanical performance and resistance to corrosion. Therefore, post-processing treatments are required. Electropolishing could be the ideal treatment to reduce the roughness of these components. It is known that various parameters, such as the type of electrolyte solution, the voltage or current applied, the treatment time, agitation, etc. They could affect the effectiveness of the electropolishing treatment. The most commonly used electrolyte solutions are dangerous to handle and difficult and expensive to dispose of. The aim of this work was to study a possible electropolishing treatment on Ti6Al4V samples made by Electron Beam Melting (EBM) using an "eco-friendly" electrolytic solution.

56) High temperature sintering of low alloy steels: effect on shrinkage and dimensional stability

Abstract: The influence of high temperature sintering on the dimensional stability and the microstructural and mechanical properties of some low alloyed steels was investigated in the EPMA Club Project "HTS". The materials investigated were five different powders: Ancorsteel 4300 and FeSiVC (Hoeganaes Corporation grades), AstaloyCrM, AstaloyCrA+2%Ni and DistaloyAE (Höganäs AB grades). Rings (55 mm external diameter, 45 mm internal diameter, 5 mm height) were cold compacted and sintered at the standard temperature of 1120°C and at high temperature in the 1180-1260°C range in different continuous furnaces. The whole manufacturing process was carried out in industrial plants. In spite of the larger shrinkage than at 1120°C, high temperature sintering does not impair the dimensional precision and stability of the rings. HTS processing widens the possibilities for new alloy systems in industrial applications with opportunities to reduce cost and achieve improvements related to processing (REACH).

68) Marmomac 2021 celebrates the return of attendance in person with a brand new communication campaign