Sökning: "Rapid solidification"

Visar resultat 1 - 5 av 19 avhandlingar innehållade orden Rapid solidification.

1. 1. Rapid solidification behaviour of Fe and Al based alloys

   Författare :Sathees Ranganathan; Hasse Fredriksson; Zhongyun Fan; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Rapid solidification; Melt spinning; Metastable phases; Fe based alloys.; Metallurgical process and manufacturing engineering; Metallurgisk process- och produktionsteknik;

   Sammanfattning : Rapid solidification experiment on Fe-Cr-Mo-Mn-Si-C alloy was performed to investigate metastable phases formed during the solidification. A wide range of cooling rate was used to analyse the sample from melt spinning technique (~107 K/s) to water quenching method (~102 K/s). LÄS MER

3. 2. Microstructure and properties of welds in the lean duplex stainless steel LDX 2101

   Författare :Elin M. Westin; John Ågren; Hannu Hänninen; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Duplex stainless steel; welding; HAZ; nitrogen; manganese; microstructure; austenite formation; phase balance; precipitates; element distribution; segregation; depletion; solidification; pitting corrosion resistance; solidification; element loss; evaporation; deposition; weld oxide; thermo-mechanical simulation; thermodynamic modelling; EPMA; XPS; post-weld cleaning; pickling; Metallurgical process and manufacturing engineering; Metallurgisk process- och produktionsteknik;

   Sammanfattning : Duplex stainless steels can be very attractive alternatives to austenitic grades due to their almost double strength at equal pitting corrosion resistance. When welding, the duplex alloys normally require addition of filler metal, while the commodity austenitic grades can often be welded autogenously. LÄS MER

4. 3. 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

5. 4. On the effect of nitrogen, hydrogen and cooling rate on the solidification and pore formation in Fe-base and Al-base alloys

   Författare :Advenit Makaya; Hasse Fredriksson; Zhongyun Fan; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Porous metals; Metal foams; Gas solubility; Fe-base alloys; Al-base alloys; M7C3 carbides; Al3Ti; Al3Fe; Rapid solidification; Metastable phases; Other materials science; Övrig teknisk materialvetenskap;

   Sammanfattning : Experiments on the production of porous metallic materials were performed on Fe-base and Al-base alloys. The method involves dissolution of gases in the liquid state and solidification at various cooling rates. The alloy compositions were selected to induce solidification of primary particles intended to control the pore distribution. LÄS MER

7. 5. Characterisation of Nickel-Based Superalloys Manufactued by Electron Beam Melting

   Författare :Annika Strondl; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEM; electron beam melting; APFIM; EBSD; XRD; DTA; nickel-based superalloys; SEM; additive manufacturing; EDS;

   Sammanfattning : Nickel-based superalloys have been manufactured by electron beam melting (EBM). EBM is an additive manufacturing process for direct production of metal parts. The part is build up by successive melting of metal powder layers in a vacuum chamber using electron beam. LÄS MER