Search for dissertations about: "Billet"

Showing result 1 - 5 of 11 swedish dissertations containing the word Billet.

  2. 1. On some positive effects of swirling flow for the continuous cast mould billets

    Author : Shavkat Kholmatov; Pär Jönsson; Simon Lille; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; swirling flow; round mould; divergent angle; aspect ratio; temperature distribution; velocity fluctuations; continuous casting of steel; mathematical modeling; CFD; Metallurgical process engineering; Metallurgisk processteknik;

    Abstract : Continuous caster moulds are the last and most important stage in the steelmaking process, where inclusions can either be generated or removed. With increasing casting speed using conventional immersion nozzles critical problems, such as unstable bulk mould flow have been noticed. READ MORE

  4. 2. Investigation of Surface Formation in As-Cast and Homogenized 6xxx Aluminium Billets

    Author : Nazlin Bayat; Torbjörn Carlberg; Håkan Olin; Yanjun Li; Mittuniversitetet; []
    Keywords : DC casting; surface segregation; surface defects; intermetallic phase; phase transformation; homogenization;

    Abstract : The direct chill (DC) casting technique to produce billets for extrusion and ingots for rollingwas developed in the 1930s. The principle, which is still valid, is a two-stage cooling with a primary cooling at a mould surface followed by water spraying directly on the surface. READ MORE

  5. 3. Magnetic Fields and Induced Power in the Induction Heating of Aluminium Billets

    Author : Mark William Kennedy; Ragnhild E. Aune; Andreas Westermoen; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Induction; heating; billets; coils; magnetic fields;

    Abstract : Induction heating is a common industrial process used for the reheating of billets before extrusion or forging. In this work the influence of the coil and work piece geometry, the effect of the electrical properties of the work piece, and the coil current and frequency, on the magnetic flux density and resulting work piece heating rates were studied. READ MORE

  6. 4. Modeling of the Stainless Steel Tube Extrusion Process

    Author : Sofia Hansson; Erman Tekkaya; Högskolan Dalarna; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Extrusion; FEM; Stainless steel; Tube; Simulering av extrusion av rostfria rör; Material Mechanics;

    Abstract : Seamless tubes of stainless steel can be extruded using glass as a lubricant in the Ugine-Sejournet process. The process is performed at high temperature and is associated with large deformations and high strain rates. READ MORE

  7. 5. A study of surface temperature and heat flux estimations in heating processes by solving an Inverse Heat Conduction Problem

    Author : Patrik Wikström; Wlodzmierz Blasiak; Björn Palm; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Metallurgical process engineering; Metallurgisk processteknik;

    Abstract : The topic of this thesis is estimation of the dynamic changes of the surface temperatureand heat flux during heating processes by using an inverse method. The local transient surface temperature and heat flux of a steel slab are calculated based on measurements in the interior of the slab. READ MORE