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dynamic nucleation

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Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006311
EISBN: 978-1-62708-179-5
... to occur, nuclei must form in the liquid. The article discusses the various types of nucleation: homogeneous nucleation, heterogeneous nucleation, and dynamic nucleation. It reviews the classification of eutectics based on their growth mechanism: cooperative growth and divorced growth. The article...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005410
EISBN: 978-1-62708-196-2
... with heterophase fluctuations that led to the formation of precipitates. It discusses the gas cluster dynamics using the kinetic approach to describe nucleation. The article presents key parameters, such as cluster condensation and evaporation rates, to describe the time evolution of the system. The predictions...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005403
EISBN: 978-1-62708-196-2
... dynamic recrystallization (DDRX). The article discusses the assumptions and simplifications for the Avrami analysis. It describes the effects of nucleation and growth rates on recrystallization kinetics and recrystallized grain size based on the Johnson-Mehl-Avrami-Kolmogorov model for static...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004019
EISBN: 978-1-62708-185-6
... of grain boundaries increases rapidly. Differences in dislocation density across the grain boundaries, coupled with high mobility, lead to the nucleation and growth of new, strain-free grains via a discontinuous dynamic recrystallization process ( Ref 17 , 22 ). The evolution of a dynamically...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005435
EISBN: 978-1-62708-196-2
... Fig. 1 Flow-block diagram of martensitic transformation as a multilevel dynamic system. See text for explanation of details. Fig. 5 Heterogeneous nucleation at strong defects. Two-dimensional variational solutions to Ginzburg-Landau model for (a) linear elastic material and (b...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003724
EISBN: 978-1-62708-177-1
... the types of nuclei available in the melt as resulting from homogeneous nucleation, heterogeneous nucleation, and dynamic nucleation ( Ref 1 ). Homogeneous Nucleation Heterogeneous Nucleation Dynamic Nucleation The thermal and compositional fields at the S/L interface determine the morphology...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004018
EISBN: 978-1-62708-185-6
.... The substructure that results from dynamic recovery effectively reflects an intermediate stage of annealing. After deformation has been completed, but before any significant drop in temperature, static recrystallization may occur by the usual processes of nucleation of new grains and the growth of those grains...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009002
EISBN: 978-1-62708-185-6
... of Recrystallization, Part I: Homogeneous Nucleation and Growth,” Acta Metall. , Vol 34 , 1986 , p 1833 10.1016/0001-6160(86)90128-8 37. Rollett A.D. , Luton M.J. , and Srolovitz D.J. , “Microstructural Simulation of Dynamic Recrystallization,” Acta Metall. , Vol 40 , 1992 , p 43...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005459
EISBN: 978-1-62708-196-2
... Cellular automata results for discontinuous dynamic recrystallization (DRX). (a) Initial structure. (b) Necklace structure formed by partial dynamic ion of (a). (c) Partial dynamic recrystallization of an ingot structure with particle-stimulated nucleation (PSN). GB, grain boundary. Source: Ref 29...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005432
EISBN: 978-1-62708-196-2
.... and Seetharaman V. , Modeling Dynamic Recrystallization Using Cellular Automata , Scr. Metall. , Vol 38 , 1998 , p 405 – 413 14. Sakai T. , Akben M.G. , and Jonas J.J. , Acta Metall. , Vol 31 , 1983 , p 631 15. Goetz R.L. , Particle Stimulated Nucleation during...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005227
EISBN: 978-1-62708-187-0
... of pushing; postulates an equation-of-state to determine surface energies. Eminently useful for low-energy (e.g., organic) systems Gilpin Disjoining pressure as the repulsive interaction and drag as attractive force; temperature gradient effects included Catalina and Stefanescu Proposed a dynamic...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005409
EISBN: 978-1-62708-196-2
... (JMAK) equation ( Eq 23 ) k B Boltzmann's constant k LSW Lifshitz, Slyosov, and Wagner (LSW) coarsening-rate constant k MLSW LSW coarsening-rate constant modified for volume-fraction effects L b length of lamellar branch N nucleation rate during phase transformation...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004027
EISBN: 978-1-62708-185-6
..., so their density, and hence the final recrystallized grain size and crystallographic texture, also depend on the deformation conditions. If dynamic recrystallization has taken place during deformation, the just nucleated dynamic grains may continue to grow after deformation to give “metadynamic...
Book Chapter

Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005816
EISBN: 978-1-62708-165-8
... Different heat flow paths. Source: Ref 55 Fig. 9 Two bubble growth-termination scenarios. (a) Dynamic equilibrium. (b) Thermal equilibrium. Source: Ref 55 Abstract Abstract Spray quenching refers to a wide variety of quenching processes that involve heat removal facilitated...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003995
EISBN: 978-1-62708-185-6
... Fig. 3 Regions of restoration processes (recovery and recrystallization) under various thermomechanical conditions. (a) Rolling with a thickness strain of 50% results in static and dynamic recovery, although static recrystallization occurs in materials with a high stacking-fault energy. (b...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005436
EISBN: 978-1-62708-196-2
... ′ ≥ 4.26; L is the sphere radius Large finite body 0.90 L ′ ≥ 4; L = V / A Predicted versus actual distortion of pinion gears modeled using computational fluid dynamics and finite-element analysis Table 5 Predicted versus actual distortion of pinion gears modeled using computational...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004029
EISBN: 978-1-62708-185-6
... component in coarse-grained low-carbon steels, particularly when rolled in the temperature range between 100 and 300 °C (212 and 570 °F), which coincides with the dynamic strain aging interval. In IF steels, on the other hand, which do not display such aging behavior, the nucleation texture is dominated...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005428
EISBN: 978-1-62708-196-2
... are shown in dark gray. Source: Ref 2 Fig. 2 Microstructural evolution of an initially random distribution of spins on a two-dimensional square lattice using the Potts model, periodic boundary conditions, metropolis spin dynamics, and kT s = 0.5. The initial configuration of spins was set...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005438
EISBN: 978-1-62708-196-2
... Fig. 1 Sargent circle for model verification and validation. Source: Adapted from Ref 4 Fig. 2 System diagram for the dynamic structural hierarchy for heterogeneous nucleation of martensite Fig. 3 Architecture of mechanistic martensite start temperature (M s ). fcc, face...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003729
EISBN: 978-1-62708-177-1
...Abstract Abstract Computational modeling assists in addressing the issues of solid/liquid interface dynamics at the microlevel. It also helps to visualize the grain length scale, fraction of phases, or even microstructure transitions through microstructure maps. This article provides a detailed...