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Träfflista för sökning "WFRF:(Dahlman Patrik 1971 ) srt2:(2008)"

Sökning: WFRF:(Dahlman Patrik 1971 ) > (2008)

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1.
  • Ryttberg, Kristina, 1977, et al. (författare)
  • High strain rate deformation induced by high-velocity forming of 100Cr6 steel
  • 2008
  • Ingår i: proceedings of The 9th International Conference on Technology of Plasticity (ICTP), Gyeongju, Korea, September 7-11, 2008. - 9788957081525 ; , s. On CD or www.ictp2008.org-
  • Konferensbidrag (refereegranskat)abstract
    • This paper concerns the development of the near-net-shape manufacturing technique of high-velocity forming. The microstructural response to the high strain-rate deformation was evaluated for 100Cr6 steel in two differently heat treated conditions: spheroidise annealed (hardness 250 HV) and quenched and tempered (330 HV). A high-velocity pressing machine was used to conduct the forming tests on cylindrical specimens. By applying different impact velocities on samples with varying sizes deformation mechanisms could be related to strain and strain rate. Extreme localization of deformation resulting in white etching bands was seen in quenched and tempered samples but not in spheroidise annealed samples. Furthermore, the strain and strain rates were shown to affect the tendency for extreme localization. No white etching bands were found in samples strained to less than 1. Appearance of white etching bands could be seen in the macroscopic shape of the samples where the more homogeneously deformed samples showed a typical barrel shape while the strongly localized samples were slightly more bell shaped. It can be concluded that for high-velocity forming to be applicable to 100Cr6 steel a careful choice of the combination strain/strain rate needs to be made.
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2.
  • 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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  • Resultat 1-2 av 2
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konferensbidrag (2)
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refereegranskat (2)
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Knutson Wedel, Maria ... (2)
Nyborg, Lars, 1958 (2)
Dahlman, Patrik, 197 ... (2)
Ryttberg, Kristina, ... (2)
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Chalmers tekniska högskola (2)
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Engelska (2)
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