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Visar resultat 16 - 20 av 39 avhandlingar som matchar ovanstående sökkriterier.

1. 16. Alloy Design and Characterization of γ′ Strengthened Nickel-based Superalloys for Additive Manufacturing

   Författare :Jinghao Xu; Johan Moverare; Ru Lin Peng; Eric Jägle; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Nickel-based superalloy; Alloy design; Laser powder bed fusion; Cracking susceptibility; Additive manufacturability; Heat treatment; γ′ precipitate; High-temperature mechanical property; Creep.;

   Sammanfattning : Nickel-based superalloys, an alloy system bases on nickel as the matrix element with the addition of up to 10 more alloying elements including chromium, aluminum, cobalt, tungsten, molybdenum, titanium, and so on. Through the development and improvement of nickel-based superalloys in the past century, they are well proved to show excellent performance at the elevated service temperature. LÄS MER

3. 17. High temperature properties of polycrystalline Mo(Si,Al)2: compression and oxidation

   Författare :Aina Edgren; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; hot compression; Mo Si; Al 2; microstructure; heating element; mechanical properties; oxidation;

   Sammanfattning : Electrification of industrial heating processes holds great promise for reducing CO2 emissions. Large furnaces operating at elevated temperatures and in demanding atmospheres are complicated but indeed important to electrify. LÄS MER

4. 18. Effect of austenitising temperature and cooling rate on microstructures of hot-work tool steels

   Författare :María Teresa Coll Ferrari; Leif Karlsson; Hans-Olof Andrén; Högskolan Väst; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Tool steel; Heat Treatment; Austenitising Temperature; Large Tools; Tempering Carbides; Bainitic Microstructures; Production Technology; Produktionsteknik; Manufacturing and materials engineering; Produktions- och materialteknik;

   Sammanfattning : The average size of hot-work tools has gradually increased over the past years.This affects the effective temperature cycle tools experience during hardening,as large dimensions prevent uniform and rapid cooling, and thereby the resulting microstructures and properties. LÄS MER

5. 19. Tribology in Metal Working

   Författare :Maria Nilsson; Staffan Jacobson; Mikael Olsson; Magnus Jarl; Uppsala universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Tribology; friction; wear; metal working; coatings; wire drawing; hot work rolls; Teknisk fysik med inriktning mot tribomaterial; Engineering Science with specialization in Tribo Materials; Steel Forming and Surface Engineering;

   Sammanfattning : This thesis focuses on the tribological performance of tool surfaces in two steel working operations, namely wire drawing and hot rolling. In all forming operations dimensions and surface finish of the products are of utmost importance. LÄS MER

7. 20. Development of a Morphology-based Analysis Framework for Asphalt Pavements

   Författare :Ibrahim Onifade; Björn Birgisson; Nicole Kringos; Denis Jelagin; William G. Buttlar; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Morphology; damage; X-ray computed tomography; top-down cracking; fracture; Morfologi; skador; röntgendatortomografi; ’top-down’sprickbildning; fraktur; Byggvetenskap; Civil and Architectural Engineering; Teknisk materialvetenskap; Materials Science and Engineering;

   Sammanfattning : The morphology of asphalt mixtures plays a vital role in their properties and behaviour. The work in this thesis is aimed at developing a fundamental understanding of the effect of the asphalt morphology on the strength properties and deformation mechanisms for development of morphology-based analysis framework for long-term response prediction. LÄS MER