Search for dissertations about: "Coarsening"

Showing result 11 - 15 of 58 swedish dissertations containing the word Coarsening.

  2. 11. Secondary hardening in some low-chromium hot-work tool steels

    Author : Jörgen Andersson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; LEAP; coarsening; nitriding; SEM; TEM; vanadium; precipitation hardening;

    Abstract : Low-chromium hot-work tool steels combine good heat conductivity with excellent tempering resistance. This property combination has made these steels ideal for die casting and extrusion. READ MORE

  4. 12. Methods for improving covariate balance in observational studies

    Author : Philip Fowler; Xavier de Luna; Ingeborg Waernbaum; Martin Huber; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; causal effect; coarsening; discretisation; proxy variables; register study; swedish social insurance agency; unobserved variables;

    Abstract : This thesis contributes to the field of causal inference, where the main interest is to estimate the effect of a treatment on some outcome. At its core, causal inference is an exercise in controlling for imbalance (differences) in covariate distributions between the treated and the controls, as such imbalances otherwise can bias estimates of causal effects. READ MORE

  5. 13. Simulation of Phase Transformations and coarsening : Computational tools for alloy development

    Author : Johan Jeppsson; John Ågren; Gerhard Inden; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; Teknisk materialvetenskap;

    Abstract : The final properties of an alloy are highly interlaced with its microstructure. It is therefore essential to control the evolution of the microstructure of the material during the fabrication process. Nowadays, materials design involves an increasing part of computational design to complement the traditional experimental trial and error approach. READ MORE

  6. 14. Morphological characterization of primary austenite in cast iron

    Author : Juan Carlos Hernando; Attila Diószegi; Jönköping University; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Lamellar Graphite Iron; Solidification; Primary Austenite; Microstructure Evolution; Dendritic coarsening; Compacted Graphite Iron; Magnesium Fading; Nodularity;

    Abstract : Automotive industry products portfolio includes a wide variety of complex‐shaped cast iron products, such as truck engine components, that need to withstand a constant trend of higher demands, especially urged by stricter environmental regulations on emissions. Combined with this continued demand on properties improvement, cast iron industry faces a process problem related to the lack of understanding of solidification and mechanisms behind defect formation. READ MORE

  7. 15. Neutron scattering studies of hard metals

    Author : Ahmet Bahadir Yildiz; Peter Hedström; Annika Borgenstam; Joakim Odqvist; Daniele Mari; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hard metals; cemented carbides; small angle neutron scattering; neutron diffraction; in-situ characterization; grain coarsening; phase separation; Teknisk materialvetenskap; Materials Science and Engineering;

    Abstract : Since their discovery about 100 years ago, tools made of hard metals have been the enablers of development in various areas: from drilling subway lines for more sustainable cities to the machining of complex next-generation airplane engine parts for reduced CO2 emissions. An increase in properties of hard metals thus leads to efficient operations with shorter lead-time, less environmental footprint, and reduced cost. READ MORE