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Träfflista för sökning "L773:1042 1122 OR L773:9781574982961 "

Sökning: L773:1042 1122 OR L773:9781574982961

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1.
  • Ryttberg, Kristina, 1977, et al. (författare)
  • Microstructure and texture development during ring rolling of 100Cr6
  • 2008
  • Ingår i: Ceramic Transactions. - 1042-1122. - 9781574982961 ; 200, s. 301-309
  • Konferensbidrag (refereegranskat)abstract
    • Pre-turned 100Cr6 steel rings with spheroidised annealed microstructure have been cold ring rolled to two levels: expanding the outer diameter by 10 and 20%. The final microstructure was shown to be varying throughout the cross-section of the ring, where the largest deformation was found close to the surface of the inner diameter. This was reflected in the hardness profile showing the highest hardness values close to the inner surface. Scanning electron microscopy showed that the microstructure below the surface of the outer diameter consisted of a greatly refined ferrite. Close to the surface of the inner diameter the structure was even more refined. Electron back scatter diffraction together with X-ray diffractometry showed that cold ring rolling changed the existing texture of the ring blanks, where {110}-planes were parallel to the axial direction of the rings, towards {110}-planes becoming parallel to the rolling direction. This resulted in a weak {110}-texture. Close to the surface of the outer diameter the greatly refined ferrite had decomposed into a more random orientation distribution.
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2.
  • Pei, Benyan, et al. (författare)
  • Thermodynamics and kinetics of passive oxidation of Si3N4-bonded sic ceramics
  • 1994
  • Ingår i: Ceramic Transactions. - 1042-1122. ; 44, s. 253-263
  • Tidskriftsartikel (refereegranskat)abstract
    • The oxidation reactions of Si3N4-bonded SiC ceramics are more complicated than a single component like SiC or Si3N4. The thermodynamics and kinetics of air oxidation of such ceramics in the temperature range of 900-1300 C are studied. The active to passive transition of oxidation was analysed by thermodynamic calculations using the JANAF table. The weight gain was measured using a TGA technique to study the kinetics. It is shown that all components contribute to the formation of a silica film. The kinetic results indicate that the oxidation reactions of Si3N4-bonded SiC ceramics are controlled by both an interface reaction and diffusion through the product layer. The activation energy obtained for the specimen studied is found to be comparable with that for SiC oxidation as reported in the literature
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