Sökning: "KTH."

Visar resultat 41 - 45 av 9743 avhandlingar innehållade ordet KTH..

  1. 41. Slag inclusion formation during solidification of steel alloys and in cast iron

    Författare :Sofia Adolfi; Hasse Fredriksson; Karin Hansson; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; solidification; segregation; precipitation; inclusions; inoculation; EMPA; Other materials science; Övrig teknisk materialvetenskap;

    Sammanfattning : This thesis explores the formation of segregation and inclusions during solidification of steel and cast iron. A better understanding of the formation mechanism should result in decreasing fraction of defects during solidification of ingot and strand material. LÄS MER

  3. 42. A study of slag-steel-inclusion interaction during Ladle treatment

    Författare :Johan Björklund; Pär Jönsson; Voicu Brabie; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Ladle treatment; steel; slag; inclusions; ladle; refining; vacuum; tool steel; oxide activity; slag models; oxygen; equilibrium; Metallurgical process and manufacturing engineering; Metallurgisk process- och produktionsteknik;

    Sammanfattning : The thesis is based on two supplements with two major objectives. In the first supplement equilibrium top slag-steel bulk and inclusions-steel bulk were investigated by comparison between calculated and measured oxygen activity values. This was done by applying different oxide activity models for slags combined with thermodynamic calculations. LÄS MER

  4. 43. Effect of swirling blade on flow pattern in nozzle for up-hill teeming

    Författare :Line Hallgren; Pär Jönsson; Jonas Alexis; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; swirling flow; up-hill teeming; nozzle; casting; fluid flow; modelling; CFD; LDA.; Metallurgical process engineering; Metallurgisk processteknik;

    Sammanfattning : The fluid flow in the mold during up-hill teeming is of great importance for the quality of the cast ingot and therefore the quality of the final steel products. At the early stage of the filling of an up-hill teeming mold, liquid steel enters, with high velocity, from the runner into the mold and the turbulence on the meniscus could lead to entrainment of mold flux. LÄS MER

  5. 44. Assessment and design of industrial manual handling to reduce physical ergonomics hazards : – use and development of assessment tools

    Författare :Carl Lind; Jörgen Eklund; Linda Rose; Annika Vänje; Esa-Pekka Takala; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Ergonomics; Human Factors; Risk Assessment; Hazard Assessment; Screening; Observation; the RAMP tool; Design; Lifting; Pushing; Pulling; Postures; Usability; Musculoskeletal Disorders; Ergonomists; Evaluation; Reliability.; Ergonomi; Human Factors; Manuell Hantering; Riskbedömningar; Screening; Observation; RAMP verktyget; Design; Lyft; Skjuta; Dra; Arbetsställningar; Användbarhet; Belastningsbesvär; Ergonomer; Utvärdering; Reliabilitet.; Technology and Health; Teknik och hälsa;

    Sammanfattning : Despite efforts of reducing harmful physical ergonomics exposures related to manual handling, the occurrence of heavy or repetitive manual handling, and non-neutral postures is high in many occupational sectors. To reduce these exposures, interventions and job design strategies can utilize risk assessment. LÄS MER

  7. 45. Modeling the microstructural evolution during hot working of C-Mn and Nb microalloyed steels using a physically based model

    Författare :Linda Lissel; Stefan Jonsson; Bertil Ahlblom; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; austenite; modeling; hot deformation; microstructure evolution; static recrystallization; dynamic recrystallization; metadynamic recrystallization; Other materials science; Övrig teknisk materialvetenskap;

    Sammanfattning : Recrystallization kinetics, during and after hot deformation, has been investigated for decades. From these investigations several equations have been derived for describing it. The equations are often empirical or semi-empirical, i.e. LÄS MER