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Visar resultat 1 - 5 av 29 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. The Effects of Morphology and Surface Oxidation of Stainless Steel Powder in Laser Based-Powder Bed Fusion

    Författare :Dmitri Riabov; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; additive manufacturing; powder surface; 316L stainless steel; oxides; oxidation; laser based-powder bed fusion; morphology; powder properties; powder production;

    Sammanfattning : Laser based-powder bed fusion (LB-PBF) is one of the many techniques within additive manufacturing (AM) that allows for near net shape manufacturing of metallic components. By using powder feedstock, it is possible to spread thin layers of powder and further selectively fuse powder in a repetitive manner until the component is completed. LÄS MER

  3. 2. Powder Bed Structure and Imbibition - A Study of Spray Dried Dairy Powders

    Författare :Erik Börjesson; Livsmedelsteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; powder bed structure; Imbibition; powder morphology; porous media;

    Sammanfattning : The formation of lumps during powder dissolution is undesirable in most cases. In a world where the use of dry products is increasing, incomplete powder dissolution and lump formation can for instance affect the color of a paint or the nutritional content of baby food. LÄS MER

  4. 3. Powder Bed Fusion – Laser Beam of Mg alloy WE43 : Establishing the process – structure – properties relationship

    Författare :Hanna Nilsson Åhman; Cecilia Persson; Francesco D'Elia; Pelle Mellin; Eduard Hryha; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Powder bed fusion - laser beam; additive manufacturing; magnesium; WE43; microstructure; Teknisk fysik med inriktning mot materialvetenskap; Engineering Science with specialization in Materials Science;

    Sammanfattning : Powder bed fusion - laser beam (PBF-LB) of Mg alloy WE43 (Mg-4wt%Y-3wt%RE-Zr) has great potential for the development of future biodegradable metal implants, as well as aerospace lightweight materials. However, the work published thus far has mainly focused on obtaining a fully dense material, and the understanding of the relationship among the PBF-LB process parameters, structure and the resulting material properties remains limited. LÄS MER

  5. 4. Laser-based powder bed fusion of stainless steels

    Författare :Dmitri Riabov; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; additive; 316L; maraging; oxidation; oxides; morphology; atomization; flowability; PBF-LB; mechanical properties; spreadability; precipitates; surface; powder; ODS;

    Sammanfattning : The aim of the present work has been to widen the knowledge of how variations within powder manufacturing affect laser-based powder bed fusion processing, and how this processing affects the microstructure and strength of stainless steels. The approach was to keep the processing parameters fixed while the powder feedstock was varied. LÄS MER

  7. 5. Electron beam powder bed fusion processing of stainless steels

    Författare :Stefan Roos; Lars-Erik Rännar; Andrei Koptioug; Carlos Alberto Botero Vega; Iain Todd; Mittuniversitetet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Additive manufacturing; Electron beam powder bed fusion; PBF-EB; Stainless steel; Mechanical properties; Micro-structure; Nanoindentation;

    Sammanfattning : Additive manufacturing (AM) is still a relatively new technology. In contrast to traditional machining where material is removed from a blank, AM is used to fuse a feedstock material into complex shapes, layer by layer, starting from an empty workspace. LÄS MER