Effect of Heating Rate on Recrystallization of Twin Roll Cast Aluminum

Sun, Naiyu; Patterson, Burton R.; Suni, Jaakko P.; Doherty, R.D.; Weiland, Hasso; Kadolkar, Puja; Blue, Craig A.; Thompson, Gregory B.

doi:10.1007/s11661-007-9367-3

Cited by 20 publications

(5 citation statements)

References 10 publications

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“…The effect of heating rate on recrystallized grain size has been extensively analysed [25,[31][32][33], however, the corresponding possible influence on recrystallization textures has been given less attention [34]. Liu et al [24] studied the effect of heating rate on the microstructure and texture of a continuous cast AA3105 aluminium alloy with two different heating rates, i.e.…”

Section: (A) (B)mentioning

confidence: 99%

Factors affecting the strength of P{011}〈566〉-texture after annealing of a cold-rolled Al–Mn–Fe–Si alloy

Huang

Marthinsen

2015

J Mater Sci

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Elongated coarse P{011}h566i-oriented grains are frequently observed after annealing of cold-rolled Al-Mn alloys with a highly supersaturated solid solution level. In this study, important factors affecting the strength of the P-texture component after annealing of a cold-rolled Al-Mn-Fe-Si alloy have been systematically investigated and their influence has been documented. The strength of the P-texture component has been analysed in terms of orientation distribution functions, area fractions and number fractions of P-grains at different conditions using EBSD. The strength of the P-texture is very sensitive to the microchemistry state in terms of the amount of Mn in solid solution (potential for concurrent precipitation) and pre-existing second-phase particles (dispersoids). In conditions of a significant P-texture, decreasing annealing temperature and heating rate, as well as increasing the amount of deformation before annealing, promotes a strengthening of the P-texture component. Detailed analyses clearly show that the strong P-texture is either due to a growth advantage of P-oriented grains at lower annealing temperatures or due to their dominating number fraction at higher temperatures. The differences in terms of P-texture intensity are explained in view of the influence of second-phase particles (dispersoids) on the recrystallization nucleation and growth behaviour.

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Section: (A) (B)mentioning

confidence: 99%

Factors affecting the strength of P{011}〈566〉-texture after annealing of a cold-rolled Al–Mn–Fe–Si alloy

Huang

Marthinsen

2015

J Mater Sci

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“…Interface defect existing in the substructure grain boundary is a high-speed channel for Si element in the filler to diffuse to the core layer. Fine grains provide high-density diffusion channels compared with coarse strip grains [16,17]. As shown at the yellow line in Figures 13 and 14, during the brazing process, Si diffuses along the grain boundary and forms Al-Si eutectic phase at the grain boundary.…”

Section: Effects Of Rate Of Reduction On Microstructure and Sagging Rmentioning

confidence: 98%

Effects of Annealing and Deformation on Sagging Resistance of a Hot‐Rolled, Four‐Layered Al Alloy Clad Sheet

Kang

Zhou

Deng

et al. 2021

Advances in Materials Science and Engineering

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Multilayer brazeable aluminum alloy sheet is prone to collapse during high-temperature brazing process. The sagging resistance of the aluminum composite sheet needs to be further improved for quality control. Effects of annealing and rate of reduction on sagging resistance, microstructure, and Si diffusion of a hot-rolled, four-layered Al clad sheet (4343/3003/6111/3003) were investigated by means of a sagging device, OM, SEM, and TEM. Results showed that once annealed at 360°C, the sagging distance was increased from 3 to 15.7 mm as the reduction rate changed from 10% to 40%. By increasing annealing temperature to 410°C, those were changed from 3.1 to 20.8 mm accordingly. At 360°C/40% and 410°C/40%, specimens exhibited weak sagging resistance, whereas fine recrystallized grains were formed in the core promoting Si penetration along grain boundaries. While the specimens were treated at 360°C/10% and 410°C/10%, better sagging resistance was observed due to the formation of coarse recrystallized grains that can suppress erosion of Si. At the same reduction rate, the sagging resistance was higher for the sample annealed at a lower temperature as more precipitates appeared in the core (at 360°C), thus leading to an increase in strength.

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“…More importantly, the recovery and recrystallization kinetics are significantly retarded by large amounts of Mn supersaturation in Al-Mn-based alloys, which is commonly referred to as concurrent precipitation [7,8]. Therefore, in order to suppress the concurrent precipitation, microstructure control by homogenization treatment prior to the cold-rolling and subsequent annealing is an important issue in advanced engineering processing in Al-Mn-based alloys [9,10].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Soaking Time on Mechanical Properties of Roll-Bonded AA3003 and AA4045 Used for Heat Exchangers

Moema,

Siyasiya,

Morudu

et al. 2023

Metals

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Due to the rising need for energy saving, high-performing automotive heat exchangers, demand has significantly grown in recent years. As a result, effective fin-tube heat exchangers are becoming more popular. These tubes are typically made by rolling flat strips of AA3003 aluminum alloys that have either one or both sides coated with AA4xxx alloys. The AA3003 type of alloy is typically used as the core, which is then covered in either AA4045 or AA4343, which melts during the brazing process to adhere the fins to the tubes. To maintain the optimal size and distribution of manganese (Mn)-containing precipitates, preheating parameters are carefully controlled. Then, longer soaking times or higher soaking temperatures result in larger precipitates, which cause the final product to exhibit poor mechanical properties. Therefore, it is crucial to optimize the different manufacturing steps, such as homogenization, soaking time, and brazing in order to achieve a high quality product. Studies on the impact of homogenization temperature and time on the microstructure of AA3xxx aluminum alloys have been conducted. However, there has been little research on the impact of soaking (reheating) time on AA3003 cladded alloys. Hence, the effects of isothermal soaking time on the microstructure and mechanical properties of AA3003 cladded with AA4045 alloy were investigated in this work. Optical microscopy (OM) and scanning electron microscopy (SEM) were used to characterize the microstructure and identify intermetallic phases. The final microstructure in terms of grain structure at various homogenization times was characterized by electron backscattered diffraction (EBSD). After the hot-rolling and cold-rolling of the as-received material, large particles of intermetallic (mainly in the form of Chinese script morphology consisting of Fe-Mn-Si) were broken into smaller particles with an increased Fe, Mn, and Si content, indicating the formation of an α-Al(Fe,Mn)Si phase. The α-Al(Mn,Fe)Si was found to be a dominant dispersoid precipitate in the modified AA3003 core. Coarsening of the Al(Mn,Fe)Si dispersoids at 505 °C was only observed at a 45 h homogenization time. The hardness trend with homogenization time was found to be similar to that after homogenization, cold working, and annealing, with exception of an increase in hardness in the latter possibly due to strain hardening (from cold-rolling).

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Effect of Heating Rate on Recrystallization of Twin Roll Cast Aluminum

Cited by 20 publications

References 10 publications

Factors affecting the strength of P{011}〈566〉-texture after annealing of a cold-rolled Al–Mn–Fe–Si alloy

Factors affecting the strength of P{011}〈566〉-texture after annealing of a cold-rolled Al–Mn–Fe–Si alloy

Effects of Annealing and Deformation on Sagging Resistance of a Hot‐Rolled, Four‐Layered Al Alloy Clad Sheet

The Effect of Soaking Time on Mechanical Properties of Roll-Bonded AA3003 and AA4045 Used for Heat Exchangers

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