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Träfflista för sökning "LAR1:ltu srt2:(1980-1989);pers:(Easterling K. E.)"

Sökning: LAR1:ltu > (1980-1989) > Easterling K. E.

  • Resultat 1-10 av 17
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1.
  • Arzt, E., et al. (författare)
  • Practical applications of hotisostatic Pressing diagrams: Four case studies
  • 1983
  • Ingår i: Metallurgical Transactions. A, Physical Metallurgy and Materials Science. - 0360-2133. ; 14:1, s. 211-221
  • Tidskriftsartikel (refereegranskat)abstract
    • The construction of mechanism maps for hot-isostatic pressing is described. Maps are constructed for a number of materials of commercial and scientific interest: a tool steel, a superalloy, Al2O3, and ice. They allow the processes involved in hot-isostatic pressing to be examined, and suggest ways of picking optimum combinations of pressure, temperature, and time to give maximum density.
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2.
  • Ashby, M.F., et al. (författare)
  • The fracture and toughness of woods
  • 1985
  • Ingår i: Proceedings of The Royal Society of London. Series A, Mathematical and physical sciences. - : The Royal Society. - 0080-4630. ; 398:1815, s. 261-280
  • Tidskriftsartikel (refereegranskat)abstract
    • Crack propagation in various woods has been examined by scanning electron microscopy, and the observations related to measurements of fracture toughness. It is found that the toughness is related in a simple way to the density of the wood, which is explained by a straightforward model. The apparent fracture toughness of wood for cracks that lie normal to the grain is larger, by a factor of about 10, than that for cracks which propagate parallel to the grain. This difference can be explained in terms of the fracture mechanics of very anisotropic solids
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3.
  • Bengtsson, B., et al. (författare)
  • Laser hardening of steel
  • 1984
  • Ingår i: Materials Research Society Symposia Proceedings. - Amsterdam : Elsevier. - 0444009019 ; , s. 789-793
  • Konferensbidrag (refereegranskat)
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4.
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5.
  • Easterling, K.E., et al. (författare)
  • On the growth of martensite in steel
  • 1980
  • Ingår i: Acta Metallurgica. - : Elsevier BV. - 0001-6160. ; 28:9, s. 1229-1234
  • Tidskriftsartikel (refereegranskat)abstract
    • Criteria based on minimum energy and maximum stress considerations have been developed for the first stages of growth of martensite in steel. It is shown that the critical size of nucleus at which dislocation-assisted growth can occur is about 25 nm diameter. The mode of growth governing low carbon lath martensite forming on {111} austenite habit planes is found to be fundamentally different from that of plate martensite which forms on irrational habit planes. A mechanism for lath thickening and growth is advanced in which dislocations nucleate at the thickest section of the lath and then follow after the coherent leading edge of the lath to generate ledges. Plate growth on the other hand can occur by the formation of twins which nucleate and thicken laterally behind the coherent leading edge of the plate.
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6.
  • Easterling, K.E., et al. (författare)
  • On the mechanics of balsa and other woods
  • 1982
  • Ingår i: Proceedings of The Royal Society of London. Series A, Mathematical and physical sciences. - : The Royal Society. - 0080-4630. ; 383:1784, s. 31-41
  • Tidskriftsartikel (refereegranskat)abstract
    • The structure of balsa wood has been characterized by scanning microscopy. The moduli and crushing strengths of the wood, in three orthogonal directions, have been related to the structure and its reponse to load: during deformation the cell walls bend elastically and collapse plastically or by fracture. It is found that the moduli, crushing strengths and anisotropy of balsa and of other wood are determined, in part, by the properties of the cell-wall material, and, in part, by the dimensions and shape of the cells themselves.
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7.
  • Helle, A.S., et al. (författare)
  • Hot isostatic pressing diagrams : new developments
  • 1985
  • Ingår i: Acta Metallurgica. - : Elsevier BV. - 0001-6160. ; 33:12, s. 2163-2174
  • Tidskriftsartikel (refereegranskat)abstract
    • The equation and procedures for constructing hot-isostatic pressing diagrams are simplified and clarified. In earlier work, three classes of mechanism were modelled: plastic yielding, power-law creep and diffusional densification. In this paper two further mechanisms are added: diffusional deformations of particles when the grain size is smaller than the particle size, and separation of pores from boundaries when grain growth occurs. Application of HIP diagrams to tool steels, alumina and copper are discussed
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8.
  • Li, Wen-Bin, et al. (författare)
  • On densification and shape change during hot isostatic pressing
  • 1987
  • Ingår i: Acta Metallurgica. - Cambridge : Elsevier BV. - 0001-6160. ; 35:12, s. 2831-2842
  • Tidskriftsartikel (refereegranskat)abstract
    • When the temperature of a powder compact is raised, heat diffuses inwards from the surface. If the compact is under pressure (as it is during HIPing), the surface layers start to densify, increasing the local thermal conductivity. Under certain conditions a densification front then propagates into the powder, and this leads to changes of shape of the compact, which is no longer identical to the preform shape. The conditions which lead to non-uniform densification are analysed and the consequences are discussed, and compared with experiments
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9.
  • Li, Wen-Bin, et al. (författare)
  • On the Zener drag pressure by cubic shaped particles
  • 1988
  • Ingår i: Strength of metals and alloys. - Amsterdam : Elsevier. - 0080348041 ; , s. 1345-1350
  • Konferensbidrag (refereegranskat)abstract
    • All models of the Zener drag effect, in which precipitate particles hinder the movement of migrating grain boundaries, are based on spherical or ellipsoidal particles. Zener drag by cubic shaped particles is modelled. It is shown that cubic particles are generally more effective than spherical particles in holding up grain growth, and that coherent particles are better in this respect that incoherent particles
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10.
  • Li, Wen-Bin, et al. (författare)
  • Residual stresses in laser transformation hardened steel
  • 1986
  • Ingår i: Surface Engineering. - : Informa UK Limited. - 0267-0844 .- 1743-2944. ; 2:1, s. 43-48
  • Tidskriftsartikel (refereegranskat)abstract
    • A simple analytical solution is developed for calculating the residual stresses which occur as a result of the laser transformation hardening of steel surfaces. The solution is based mainly on taking account of the dilatation resulting from the martensitic transformation and allows the influence of the many and varied parameters involved in laser transformation hardening (beam size and intensity, material properties, composition, etc.) to be readily assessed. Satisfactory agreement between the theoretical predictions and reported experimental measurements of residual stress is obtained
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  • Resultat 1-10 av 17

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