Sökning: "Undercooling"

Visar resultat 1 - 5 av 10 avhandlingar innehållade ordet Undercooling.

1. 1. On the Nucleation and Inoculation of Metals

   Författare :Lena Magnusson; Hasse Fredriksson; Peter Schumacher; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Solidification; nucleation; inoculation; undercooling; interface energy; refractory metals; latent heat; inclusions; nodular cast iron; Materials science; Teknisk materialvetenskap;

   Sammanfattning : Latent heat during recalesence and nucleation and post-recalesence temperature was analysed for refractory metals. An effect on latent heat was found by alloying the pure elements with other refractories. Latent heat was found to be 15-65% of tabulated values. Interface energy was evaluated from undercooling experiments. LÄS MER

3. 2. On the nucleation and solidification of silicon and refractory materials

   Författare :Lena Magnusson; KTH; []
   Nyckelord :Solidification; Nucleation; Interstitials; Vacancies; Undercooling; Silicon; Refractory metals; Non-transition metals; Surface energy; Interface energy; Latent heat; TECHNOLOGY; TEKNIKVETENSKAP;

   Sammanfattning : .... LÄS MER

4. 3. Phase-field modeling of diffusion controlled phase transformations

   Författare :Irina Loginova; KTH; []
   Nyckelord :phase-field; dendritic growth; grain boundary; Widmanstaetten plate; solidification;

   Sammanfattning : Diffusion controlled phase transformations are studied bymeans of the phase-field method. Morphological evolution ofdendrites, grains and Widmanst\"atten plates is modeled andsimulated.Growth of dendrites into highly supersaturated liquids ismodeled for binary alloy solidification. LÄS MER

5. 4. Microstructure Formation During Solidification and Solid State Transformation in Compacted Graphite Iron

   Författare :Mathias König; Magnus Wessén; Ingvar L. Svensson; Jorge Sikora; Jönköping University; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cast Iron; CGI; Microstructure Formation; Mechanical Properties; Modelling; Solidification; Solid State Transformation;

   Sammanfattning : Compacted graphite iron (CGI) is rapidly becoming an attractive alternative material for engine components in the automotive industry, replacing lamellar graphite iron (LGI) in applications where high mechanical strength is desired. However, the gain in mechanical strength comes with a cost; thermal conductivity, process control and machining are three areas that are more challenging for CGI. LÄS MER

7. 5. On the solidification of Al alloys during microgravity

   Författare :Johan Dahlström; KTH; []
   Nyckelord :;

   Sammanfattning : Thermal analyses have been performed on Al, Al-Cu alloys,Al-Sn alloys, Pb, Sn, Pb-Sn alloys and Al-based amorphousalloys were also investigated. The cooling rates varied fromless than a Kelvin per minute to more than 10,000 Kelvin persecond. Solidification was made under normal gravity and undermicrogravity conditions. LÄS MER