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- Ringer, S.P, et al.
(författare)
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Effect of particle pinning on recrystallization of a titanium-stabilized stainless steel
- 1990
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Ingår i: Recrystallization '90. - Warrendale, Pa : Minerals, Metals & Materials Society. - 0873391241 ; , s. 483-489
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Konferensbidrag (refereegranskat)abstract
- Recent work has shown that maintenance of coherency between stable particles and matrix after the bypassing of grain boundaries during grain growth can occur to reduce the energy of the particle /matrix interface, and that this occurs by a diffusion controlled bodily rotation of the particle. Since coherent particles, in general, offer more resistance to migrating boundaries than incoherent ones, a particle rotation, if it occurs, should tend to help refine grain size following recrystallization. The recrystallization and early stages of grain growth of a deformed Ti-stabilized austenitic stainless steel (321) containing coherent and semicoherent TiC precipitates has been studied by light optical and transmission electron microscopy. Evidence for a particle rotation following recrystallization of this alloy is presented. A model explaining this behaviour is developed and discussed in terms of the likely effects phenomena such as this and particle reversion will have on the recrystallization behaviour of these steels
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| 3. |
- Ringer, S.P., et al.
(författare)
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On the rotation of precipitate particles
- 1992
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Ingår i: Acta Metallurgica et Materialia. - 0956-7151. ; 40:2, s. 275-283
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Tidskriftsartikel (refereegranskat)abstract
- An energetically unfavourable situation can develop when coherent particles are bypassed by migrating grain boundaries. This is due to the precipitates being exposed to incoherent interfaces in the new matrix. In this work, the rotation of precipitate particles to low energy, coherent orientations in the new matrix is shown to be one of several possible responses to this situation. A physical and kinetic model for the rotation is put forward and the results of calculations of rotation rate presented. It is shown that particle rotation is controlled by interfacial diffusion and depends upon alloy composition, time, temperature and particle size and shape. The possibility of particle rotation occurring during particle/boundary contact is also discussed. This is shown to depend upon the nature of the boundary type. Generally, boundaries moving under large driving pressures with high velocities (e.g. phase transformation interfaces), are less likely to allow rotation during particle/boundary contact than less mobile boundaries such as those in grain growth and recrystallization. Experimental results, from SAD and TEM of a Ti stabilized austenitic stainless steel containing a dispersion of coherent TiC precipitates is also presented and supports the particle rotation model
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