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Visar resultat 1 - 5 av 19 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Nucleation and growth of martensite in steel

   Författare :Annika Borgenstam; KTH; []
   Nyckelord :martensite; Fe-alloys; α-martensite; athermal martensite; isothermal martensite; plate martensite; lath martensite; nucleation; growth; thermodynamics; plateau temperature; driving force; activation energy; bainite; Widmanstätten α; diffusive mechanism; displacive mechanism; ε-martensite; TECHNOLOGY; TEKNIKVETENSKAP;

   Sammanfattning : .... LÄS MER

3. 2. Aspects of Structural Evolution in Cemented Carbide – Carbide Size, Shape and Stability

   Författare :Ida Borgh; Joakim Odqvist; Peter Hedström; Annika Borgenstam; Jean-Michel Missiaen; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cemented carbide; Ti; Zr C; Coarsening; Phase separation; C-activity; initial WC powder size; electron backscattered diffraction; microscopy; X-ray diffraction;

   Sammanfattning : Cemented carbide is a composite material used in applications like cutting tools and rock drilling inserts. The material commonly consists of WC grains embedded in a Co-rich binder phase and the material properties strongly depend on the WC grain size. LÄS MER

4. 3. Integrated Computational and Experimental Study of Additively Manufactured Steels

   Författare :Chia-Ying Chou; Greta Lindwall; Joakim Odqvist; Annika Borgenstam; Johan Moverare; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Additive Manufacturing; Powder Bed Fusion – Laser Beam; Computational Thermodynamics and Kinetics; Hot-work Tool Steel; Ferritic Stainless Steel; Additiv tillverkning; Powder Bed Fusion – Laser Beam; Tillämpad termodynamik och kinetik; Varmarbetsverktygsstål; Ferritiska rostfria stål; Materials Science and Engineering; Teknisk materialvetenskap;

   Sammanfattning : The design freedom Additive Manufacturing (AM) offers provides new solutions for improving functionality in industrial applications. It also offers unique opportunities when it comes to materials design. LÄS MER

5. 4. Precipitation in Advanced Stainless Steels

   Författare :Niklas Holländer Pettersson; Annika Borgenstam; Sten Wessman; Joacim Hagström; Jacques Charles; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Teknisk materialvetenskap; Materials Science and Engineering;

   Sammanfattning : Advanced stainless steels often suffer from complex precipitation behaviour due to the high levels of alloying elements needed to obtain their attractive properties. This demands a correct handling of the material to avoid formation of harmful phases during production, manufacturing and service. LÄS MER

7. 5. Computational Materials Design of Medium Mn Steels

   Författare :Fei Huyan; Annika Borgenstam; Peter Hedström; Marcel Somers; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : Medium Mn steels (~ 3–10 mass % Mn), a new category of advanced high strength steels, attracted worldwide research interests recent years due to their excellent mechanical properties and low cost. These steels have fine microstructures and contain large fraction of metastable retained austenite (~ 30 volume %), therefore exhibit excellent strength and elongation. LÄS MER