Sökning: "Plastic de formation"

Visar resultat 1 - 5 av 12 avhandlingar innehållade orden Plastic de formation.

  1. 1. Martensitic Transformations in Steels : A 3D Phase-field Study

    Författare :Hemantha Kumar Yeddu; John Ågren; Annika Borgenstam; Yunzhi Wang; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; Phase-field method; Martensitic transformations; Plastic de formation; Multi-length scale modeling; Microstructure; Stress states; Steels;

    Sammanfattning : Martensite is considered to be the backbone of the high strength of many commercial steels. Martensite is formed by a rapid diffusionless phase transformation, which has been the subject of extensive research studies for more than a century. LÄS MER

  2. 2. Mechanisms of Plastic Deformation of Cemented Carbide and Cermet Cutting Tools

    Författare :Gustaf Östberg; Chalmers University of Technology; []
    Nyckelord :SEM; cermets; TEM; plastic deformation; ab initio calculations; EFTEM; APFIM; FIB; cemented carbides; EBSD;

    Sammanfattning : In this thesis, the physical mechanisms acting during plastic deformation of hardmetals used in metal cutting applications have been investigated. Microstructural and microanalytical studies have been performed on cemented carbides as well as cermet materials. LÄS MER

  3. 3. PFB Air Gasification of Biomass, Investigation of Product Formation and Problematic Issues Related to Ammonia, Tar and Alkali

    Författare :Nader Padban; Institutionen för kemiteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NH3 formation; agglomeration; thermal conversion; PNA; PAH; alkali; tar; Biomass; gasication; ammonia reduction; Chemical technology and engineering; Kemiteknik och kemisk teknologi;

    Sammanfattning : Fluidised bed thermal gasification of biomass is an effective route that results in 100 % conversion of the fuel. In contrast to chemical, enzymatic or anaerobic methods of biomass treatment, the thermal conversion leaves no contaminated residue after the process. LÄS MER

  4. 4. Migration from plastic food packaging during microwave heating

    Författare :Jonas Alin; Minna Hakkarainen; Sahar Al-Malaika; KTH; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; migration; food packaging; microwave; degradation; food simulant; antioxidant;

    Sammanfattning : Microwave heating of food has increased rapidly as a food processing technique. This increases the concern that chemicals could migrate from food packaging to food. The specific effect of microwave heating in contrast to conventional heating on overall and specific migration from common plastic food storage boxes was studied in this work. LÄS MER

  5. 5. Generalised stacking fault energy and plastic deformation of austenitic stainless steels

    Författare :David Molnar; Levente Vitos; Guocai Chai; Dávid Sándor Molnár; Högskolan Dalarna; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; stacking fault energy; stainless steel; plasticity; deformation; ab initio; Steel Forming and Surface Engineering; Stålformning och ytteknik; Materials Science and Engineering; Teknisk materialvetenskap;

    Sammanfattning : Austenitic stainless steels are primarily known for their exceptional corrosion resistance. They have the face centred cubic (FCC) structure which is stabilised by adding nickel to the Fe-Cr alloy. The Fe-Cr-Ni system can be further extended by adding other elements such as Mn, Mo, N, C, etc. in order to improve the properties. LÄS MER