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particle coarsening

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Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005599
EISBN: 978-1-62708-174-0
..., and its simplification, for single-parameter models, in which the microstructure evolution may be treated as an isokinetic reaction. It explains that isokinetic microstructure models are applied to diffusional transformations in fusion welding, covering particle dissolution, growth, and coarsening...
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
...-alpha microstructure. Source: Ref 27 . (a) Coarsening kinetics in terms of average alpha-particle size as a function of time. (b) Comparison of the ratio of the measured coarsening rate at different temperatures (and hence volume fractions, ϕ) and the calculated value of k MLSW / f (ϕ) to various...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006285
EISBN: 978-1-62708-169-6
... parts and semiproducts. This article discusses the processes involved in annealing, namely, recovery, recrystallization, and grain coarsening. It lists the heat treatment conditions of processed aluminum alloys. It provides information on the types of heat treatment, which include preheating, full...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003731
EISBN: 978-1-62708-177-1
... material crystal structure ( Ref 2 ). The GP precipitates generally grow into more stable transition phases and eventually an equilibrium phase. Coarsening of the particles occurs because the microstructure of a two-phase alloy is not stable unless the interfacial energy is at a minimum. A lower...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003054
EISBN: 978-1-62708-200-6
..., corrosion resistance, and other properties. This article discusses the fundamentals of sintering and its effects on pore structures and particle density. It addresses some of the more common sintering methods, including solid-state, liquid-phase, and gas pressure sintering, and presents alternative...
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
... particle coarsening would be expected. When a model behaves well at these extreme conditions, confidence in the model results for other conditions is enhanced. Comparing the results of the model for well-known, simplified degenerate problems for which exact analytical solutions may be available...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003254
EISBN: 978-1-62708-176-4
... be observed in hot-rolled, low-carbon steels. At low coiling temperatures, finer carbides (e.g., Fe 3 C and NbC) are typically produced, resulting in increased strength. At higher coiling temperatures, the carbide particles coarsen at a constant volume fraction, which typically results in a lower strength...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001341
EISBN: 978-1-62708-173-3
... causes the precipitate particles to go into solution, and the cooling rate is too high for reprecipitation. At locations 2 and 3, the precipitate particles partially dissolve and coarsen. After postweld artificial aging, fine precipitate particles are again formed at location 1, causing the hardness...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005613
EISBN: 978-1-62708-174-0
... , to their size, r (i.e., f / r ). At regions near the fusion line, where the temperature is well above the dissolution temperature of carbonitrides ( T d ), profound grain growth can occur as a result of dissolution and/or coarsening of precipitates and subsequent reduction in particle pinning effect...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005455
EISBN: 978-1-62708-196-2
... aluminum alloy. Source: Adapted from Ref 28 Fig. 4 Effect of particle size on yield strength with operating s involving dislocation particle interactions. Time and yield strength in arbitrary units (A.U.) Fig. 5 Schematic of the Orowan mechanism. The dislocation line moves left...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006117
EISBN: 978-1-62708-175-7
.... Ardell A.J. , The Effect of Volume Fraction on Particle Coarsening: Theoretical Considerations , Acta Metall. , Vol 20 , 1972 , p 61 – 71 145. Brailsford A.D. and Wynblatt P. , The Dependence of Ostwald Ripening Kinetics on Particle Volume Fraction , Acta Metall. , Vol 27...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005786
EISBN: 978-1-62708-165-8
... to grain sizes that may be coarser than would be observed in steels without any grain-refining additive. At still higher austenitizing temperatures, the pinning particles coarsen and lose effectiveness, so normal grain growth resumes, and austenite grain sizes are similar to the steels without grain...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006250
EISBN: 978-1-62708-169-6
... in discontinuous or exaggerated grain growth. If the temperature is high enough or the time long enough, the precipitated second-phase particles can coarsen, become larger and fewer in number, or even redissolve. Because this is not a uniform process, select boundaries will break away before others and proceed...
Book Chapter

By P.S. Grant
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005225
EISBN: 978-1-62708-187-0
...-controlled coarsening of the solid particles/grains in the relatively flat temperature gradient of the slowly cooling preform may be expected to occur, following: (Eq 2) d 3 − d 0 3 = K ( T ) t where d is the grain diameter at time t , d 0 is the starting grain size at t = 0...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006509
EISBN: 978-1-62708-207-5
.... Slow quenching resulted in precipitation of equilibrium η at the grain boundaries. Source: Ref 5 Fig. 6 Mechanisms of strengthening for precipitation hardening. (a) Dislocation cutting a particle. (b) Dislocation bowing around a precipitate based on Orowan’s mechanism of dispersion...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001419
EISBN: 978-1-62708-173-3
... with moving dislocations, thus providing high strength at room temperature. However, when these alloys are exposed to elevated temperatures, the precipitate particles undergo dissolution and/or coarsening, thereby reducing the strength of the base alloy. This behavior precludes the use of these alloys...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005228
EISBN: 978-1-62708-187-0
... and shrinkage porosity, fragmentation of dendrites, the as-cast grain size, grain shapes, and crystallographic texture. Even the detailed distributions of second-phase particles, including equilibrium and nonequilibrium precipitates, as well as the dispersion of mold wall particles and dross are affected...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003743
EISBN: 978-1-62708-177-1
... grains. 2% nital etch. 200× Fig. 11 Fe-0.07% oxygen alloy that was deformed and partially recrystallized, showing new grains (light) that were nucleated at iron oxide particles (dark). 2% nital etch. 750× Fig. 12 0.10% carbon steel cold rolled 90% to a thickness of 0.25 mm (0.010...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003620
EISBN: 978-1-62708-182-5
... °C (480 °F) for 30 min to coarsen the porosity. Dealloying in Aqueous Environments The Critical Potential Below the Critical Potential Morphology Above the Critical Potential Mechanisms References References 1. Sieradzki K. and Newman R.C. , Brittle Behavior...
Series: ASM Handbook
Volume: 1
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v01.a0001007
EISBN: 978-1-62708-161-0
... structure flattened by rolling with equiaxed, strain-free grains. Although precipitate coarsening and particle solution and reprecipitation also occur, they are not of particular importance for most grades. For AKDQ steels, on the other hand, the characteristics of precipitation and of particle coarsening...