Physically-Based Modelling of Strength, Microstructure and Recrystallisation during Thermomechanical Processing of Al-Mg Alloys

Furu, Trond; Shercliff, Hugh; Sellars, C. M.; Ashby, MF

doi:10.4028/www.scientific.net/msf.217-222.453

Cited by 23 publications

(18 citation statements)

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“…A number of works have already reported on recrystallization kinetics using the equations suggested by Sellars et al [6], and expressed the fraction of dynamic recrystallization as…”

Section: Estimating the Fraction Of Dynamic Recrystallization (Kinetimentioning

confidence: 99%

“…On the other hand, the microstructural softening of AZ31 Mg alloy was known to arise from the dynamic recrystallization (DRX) [5]. To quantify the microstructural softening, a number of works have already been reported on dynamic recrystallization kinetics using the equations suggested by Sellars and co-workers [6]. Although those works are very useful, they have difficulties in determining parameters used in the equation.…”

Section: Introductionmentioning

confidence: 98%

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Flow softening behavior during high temperature deformation of AZ31Mg alloy

Lee

Reddy

Yeom

et al. 2007

Journal of Materials Processing Technology

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“…A number of works have already reported on recrystallization kinetics using the equations suggested by Sellars et al [6], and expressed the fraction of dynamic recrystallization as…”

Section: Estimating the Fraction Of Dynamic Recrystallization (Kinetimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Flow softening behavior during high temperature deformation of AZ31Mg alloy

Lee

Reddy

Yeom

et al. 2007

Journal of Materials Processing Technology

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“…These relationships are based on quantitative analysis of the dislocation structures in the as-deformed state. [2][3][4][5][6][7][8] The nucleation density per unit volume, N v , arises from preferential nucleation at grain boundaries and can be related to the subgrain size, d, as 18) .... (A1) where P v is the number of grain corners per unit volume where four grains meet (which are rarely seen in optical microstructure sections), L v is the line length per unit volume where three grains meet ('triple points' in optical micro- …”

Section: Appendix Physical Basis For Analysis Of Recrystallization Kmentioning

confidence: 99%

“…The observations are interpreted in terms of a physically based model derived from transmission electron metallographic studies of hot worked aluminium alloys, which also undergo only work hardening and dynamic recovery during hot deformation. [2][3][4][5][6][7][8] …”

Section: Introductionmentioning

confidence: 99%

Hot Deformation and Recrystallization of 3% Silicon: Steel Part 2: Effect of Microstructural Variables on Static Recrystallization

Akta¹,

Richardson²,

Sellars³

2005

ISIJ Int.

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The recrystallization kinetics and the recrystallized grain size of 3 % Si steel after hot rolling at temperatures of 900 to 1 100°C and annealing at the rolling temperature have been investigated for a range of initial grain sizes from 140 to 850 mm and initial austenite contents from 0 to 16 %. It is shown that, in single phase ferrite, nucleation of recrystallization takes place only at grain boundaries, whereas some intragranular nucleation also occurs when austenite is present during rolling. Finer initial grain size and the presence of austenite therefore lead to faster recrystallization and to finer recrystallized grain size.Recovery during annealing causes a rapid decrease in stored energy, and therefore a decrease in the growth rate of recrystallizing regions with annealing time. This results in plateaux in the fraction recrystallized, which decrease in level with increase in initial grain size and with decrease in initial austenite content. Recrystallization kinetics approximate closely to site saturated nucleation and to negligible coarsening of recrystallized grains, leading to simple relationships between the time for 0.3 fraction of recrystallization and the fully recrystallized grain size.KEY WORDS: silicon steel; hot rolling; static recrystallization; quantitative metallography; grain size; austenite content.ing after hot rolling.Other slabs of Mat(A) were rolled and annealed to produce different grain sizes of 140, 235 (Mat(A1)), and 475 mm with 16 % austenite present, and of 180 (Mat(A3)), 340 and 580 mm with 0 % austenite present, for further rolling and annealing to investigate the influence of grain size on recrystallization behaviour. It is noteworthy that while there is any austenite present at a particular position in the slab used for metallographic investigation (1/4 thickness and the centre), the carbon content in solution is expected to remain at about 0.02 % C, whereas once single phase ferrite is produced, further annealing reduces the carbon in solution to very low levels. For comparison of results with decarburized Mat(A), a second steel Mat(B) of composition 3.31% Si, 0.016% C was produced. This had a grain size of 233Ϯ10 mm and remained single phase ferrite at all reheating temperatures. 1)Experimental rolling was carried out on a 50 t Hille rolling mill. For most of the investigation in this paper, a total equivalent strain of 0.82 was applied in two sequential passes of 30 % reduction. A chromel-alumel thermocouple embedded to the centre of the slab was used to record temperature during rolling, which included 10 s from withdrawal of the slab from the furnace to the first pass and about 15 s between passes. Rolling temperatures quoted are slab centre temperatures at entry to the first pass. As discussed elsewhere, 9) there was no detectable recrystallization in the coarse grained materials rolled by a single pass of 30 % reduction on annealing for at least an order of magnitude longer time that the 15 s interpass time, even at 1 100°C. For the smallest grain sizes, recrystalli...

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“…Recently, Sheppard and Duan [14] have confirmed that the physical model will give better computed results than the empirical model in the simulation of aluminium extrusion. The physical model proposed by Furu and coworkers [15,16] has been modified for use in this study.…”

Section: Introductionmentioning

confidence: 99%

Prediction of structure during shaped extrusion and subsequent static recrystallisation during the solution soaking operation

Sheppard

2006

Journal of Materials Processing Technology

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Physically-Based Modelling of Strength, Microstructure and Recrystallisation during Thermomechanical Processing of Al-Mg Alloys

Cited by 23 publications

References 0 publications

Flow softening behavior during high temperature deformation of AZ31Mg alloy

Flow softening behavior during high temperature deformation of AZ31Mg alloy

Hot Deformation and Recrystallization of 3% Silicon: Steel Part 2: Effect of Microstructural Variables on Static Recrystallization

Prediction of structure during shaped extrusion and subsequent static recrystallisation during the solution soaking operation

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