Sökning: "Pearlite"

Visar resultat 11 - 15 av 25 avhandlingar innehållade ordet Pearlite.

1. 11. On the Microstructure and the Thermal Conductivity in Compacted Graphite Iron

   Författare :Martin Selin; Ingvar L. Svensson; Daniel Holmgren; Lars Nyborg; Kenneth Hamberg; Jönköping University; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Compacted graphite iron; Microstructure; Thermal conductivity; Ferrite; Cementite; Nodularity; Mathematical modelling; Laser flash technique; Austempering;

   Sammanfattning : Compacted graphite iron (CGI) is a cast iron material that has gained much attention due to its attractive material properties which are intermediate between those of grey and ductile cast iron. In the automotive industry compacted graphite iron has become an interesting alternative material to grey cast iron in components like cylinder blocks or cylinder heads. LÄS MER

3. 12. Material characterisation for simulation of press hardening

   Författare :Paul Åkerström; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hållfasthetslära; Solid Mechanics;

   Sammanfattning : The growing effort to reduce vehicle weight and improve passive safety in the automotive industry has drastically increased the demand for ultra high strength steel components. There exist several production methods for such components, where the press hardening technique (hot stamping) is one of the most successful in producing complex components from boron steel. LÄS MER

4. 13. Inhomogenity in microstructures

   Författare :Jacek Komeda; KTH; []
   Nyckelord :;

   Sammanfattning : The purpose of the present thesis is to quantitativelycharacterise structural features which contribute to thematerial anisotropy and to relate developed parameters to thematerial properties. Various forms of structural inhomogeneitywere quantified with the help of comuterised image analysisusing quantitative metallography and statistical analysismethods. LÄS MER

5. 14. Deformation Behaviour of Near Fully Pearlitic Railway Steels During Monotonic and Cyclic Loading

   Författare :Niklas Köppen; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; LCF; low cycle fatigue; Near fully pearlitic steels; work hardening; microstructure; tensile deformation; medium carbon steel;

   Sammanfattning : The main conclusions that could be drawn from the present work are that the deformation behaviour of fully and near fully pearlitic steels is very similar and that a combination of low temperature, prestraining and high deformation rates is critical for the performance. This was shown from microscopy studies, tensile, impact and low cycle fatigue (LCF) testing. LÄS MER

7. 15. On the mechanisms of structure formation in nodular cast iron

   Författare :Magnus Wessén; KTH; []
   Nyckelord :;

   Sammanfattning : The mechanisms of structure formation in nodular cast ironhave been examined by experiments and by physical modelling. Byincorporation of models for nucleation and growth for allrelevant phases into a heat flow calculation. it is possible topredict the as-cast structure by computer simulation. LÄS MER