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Träfflista för sökning "(hsv:(TEKNIK OCH TEKNOLOGIER) hsv:(Materialteknik)) srt2:(1970-1979) srt2:(1976)"

Sökning: (hsv:(TEKNIK OCH TEKNOLOGIER) hsv:(Materialteknik)) srt2:(1970-1979) > (1976)

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  • Easterling, K.E., et al. (författare)
  • The nucleation of martensite in steel
  • 1976
  • Ingår i: Acta Metallurgica. - : Elsevier BV. - 0001-6160. ; 24:4, s. 333-341
  • Tidskriftsartikel (refereegranskat)abstract
    • Calculations of the total energy for transforming austenite to martensite in the form of thin ellipsoidal plates, fully coherent with the austenite, show that the process may be spontaneous in the presence of pre-existing dislocations. It is found that dislocations, or groups of dislocations, in the austenite are suitable sites for martensite nucleation in that their strain fields may interact favourably with the strain field associated with the Bain deformation thereby eliminating the energy barrier to nucleation. The driving force for twinning to occur virtually simultaneously with nucleation is large and when this happens energy is released for thickening and growth of the nucleus. It is also found that the strain energy of coherent plates of martensite, whether twinned or untwinned, is a function of their orientation in the austenite, although the lowest strain energy case occur nevertheless over a relatively wide range of orientations
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  • Roberts, W., et al. (författare)
  • An in situ sem study of void development around inclusions in steel during plastic deformation
  • 1976
  • Ingår i: Acta Metallurgica. - : Elsevier BV. - 0001-6160. ; 24:8, s. 745-758
  • Tidskriftsartikel (refereegranskat)abstract
    • Void development around ellipsoidal inclusions (mainly MnS) in steel has been investigated by means of in situ SEM tensile tests using specimens such that the tensile axis is the short-transverse direction in rolled plate. By simultaneous video recording of the microscope image and a load-elongation curve, the nucleation and growth of cavities has been monitored quantitatively. Careful investigation reveals that the behaviour at a free surface as regards cavitation is rather accelerated in comparison to that observed internally; this can be reconciled with a modified interfacial stress distribution around those hard particles in a plastically deformed matrix which lie at or near the specimen surface. In addition, some observations pertaining to the coalescence of cavities as a prerequisite to terminal ductile separation, are described and considered.
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  • Resultat 1-10 av 37

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