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Maraging steel --- Protective coatings --- Corrosion. --- Testing.

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Maraging steels are high-strength steels combined with good toughness. They are used particularly in aerospace and tooling applications. Maraging refers to the ageing of martensite, a hard microstructure commonly found in steels.Maraging steels: modelling of microstructure, properties and applications covers the following topics: Introduction to maraging steels; Microstructure of maraging steels; Mechanical properties of maraging steels; Thermodynamic calculations for quantifying the phase fraction and element partition in maraging systems and precipitation hardening steels; Quantifica

Maraging steel --- Microstructure. --- Properties. --- Industrial applications. --- Steel, Maraging --- Nickel steel --- Steel alloys

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Maraging steel --- Protective coatings --- Protective coatings --- Corrosion. --- Testing. --- Testing.

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Laser Powder Bed Fusion (LPBF) process allows powders of different materials to be selectively melted together. However, the unsintered powders are mixed together and therefore cannot be used anymore. To reduce waste, a method to separate powders presents a great interest. The goal of this thesis is to find and design a method to separate two powder mixes: 316L/CuCrZr and M300/CuCrZr. The difficulty lies in similar powder properties, such as density, particle size distribution and electrical resistivity. After discussion on different separation methods, the focus will be on magnetic separation process. For the 316L/CuCrZr couple, it appears that 316L shows a ferromagnetic behaviour only for smallest particles. This heterogeneous magnetic property makes a separation by magnetism difficult to achieve. On the other side, since M300 presents strong ferromagnetic behaviour, while CuCrZr a non-magnetic one, a magnetic-based separation is considered for this couple. A prototype is developed, based on free-fall separation and powered by an ultrasonic device. Some issues are raised and system parameters are discussed to find an optimal solution for the separation process.

powder --- aerosint --- metal --- maraging --- M300 --- 316L --- CuCrZr --- magnetic separation --- additive manufacturing --- powder bed fusion --- laser --- Ingénierie, informatique & technologie > Ingénierie civile

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Powder metallurgy is a group of advanced processes used for the synthesis, processing, and shaping of various kinds of materials. Initially inspired by ceramics processing, the methodology comprising the production of a powder and its transformation to a compact solid product has attracted attention since the end of World War II. At present, many technologies are availabe for powder production (e.g., gas atomization of the melt, chemical reduction, milling, and mechanical alloying) and its consolidation (e.g., pressing and sintering, hot isostatic pressing, and spark plasma sintering). The most promising methods can achieve an ultra-fine or nano-grained powder structure, and preserve it during consolidation. Among these methods, mechanical alloying and spark plasma sintering play a key role. This book places special focus on advances in mechanical alloying, spark plasma sintering, and self-propagating high-temperature synthesis methods, as well as on the role of these processes in the development of new materials.

History of engineering & technology --- in situ diffraction --- aluminides --- reactive sintering --- mechanism --- powder metallurgy --- iron silicide --- Fe–Al–Si alloy --- mechanical alloying --- spark plasma sintering --- characterization --- FeAlSi --- intermetallic alloys --- microstructure --- nanoindentation --- mechanical properties --- titanium aluminides and silicides --- casting --- heterophase magnesium matrix composite --- Mg2Si --- carbon nanotubes --- nanopowders de-agglomeration --- sintering --- biomaterials --- metallic composites --- powder technology --- zinc --- Ni-Ti alloy --- self-propagating high-temperature synthesis --- aging --- compressive test --- hardness --- shape memory --- maraging steel --- atomized powder --- selective laser melting --- heat treatment --- precipitation hardening --- self-healing --- aluminium alloy --- grain boundary diffusion --- Nd–Fe–B magnets --- hydrogenation --- magnetic properties --- MgAl2O4 --- lithium fluoride --- cobalt fluoride --- manganese fluoride --- grain growth --- compressive strength --- oxidation resistance --- wear --- multi principal element alloy --- tensile strength --- fracture --- ductility --- powder --- critical raw materials --- cutting tools --- new materials --- new machining methods --- modelling and simulation --- in situ diffraction --- aluminides --- reactive sintering --- mechanism --- powder metallurgy --- iron silicide --- Fe–Al–Si alloy --- mechanical alloying --- spark plasma sintering --- characterization --- FeAlSi --- intermetallic alloys --- microstructure --- nanoindentation --- mechanical properties --- titanium aluminides and silicides --- casting --- heterophase magnesium matrix composite --- Mg2Si --- carbon nanotubes --- nanopowders de-agglomeration --- sintering --- biomaterials --- metallic composites --- powder technology --- zinc --- Ni-Ti alloy --- self-propagating high-temperature synthesis --- aging --- compressive test --- hardness --- shape memory --- maraging steel --- atomized powder --- selective laser melting --- heat treatment --- precipitation hardening --- self-healing --- aluminium alloy --- grain boundary diffusion --- Nd–Fe–B magnets --- hydrogenation --- magnetic properties --- MgAl2O4 --- lithium fluoride --- cobalt fluoride --- manganese fluoride --- grain growth --- compressive strength --- oxidation resistance --- wear --- multi principal element alloy --- tensile strength --- fracture --- ductility --- powder --- critical raw materials --- cutting tools --- new materials --- new machining methods --- modelling and simulation