Microstructure and texture evolution after twin roll casting and subsequent cold rolling of Al–Mg–Mn aluminium alloys

In this paper, non-silicon steel sheets were produced by both twin-roll casting method and conventional process. Orientation characteristics and texture evolution of the sheets during casting, cold rolling and recrystallization annealing were investigated for comparison. It was found that the subsurface of twin-roll casting strips are characterized by weak {100} orientation while the central layer by random orientation. Twin-roll casting process can decrease α fiber (//RD) and increase γ fiber (//ND) during cold rolling process. Consequently, the η fiber (//RD) favorable for magnetic properties of non-silicon steels is enhanced and the detrimental {111} component is suppressed after annealing.

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Analysis of Properties of Selected Aluminium Alloys, Obtained by Twin Roll Casting Method and Subjected to Cold Rolling Process

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.641.202 ◽

2015 ◽

Vol 641 ◽

pp. 202-209

Author(s):

Wojciech Ściężor ◽

Andrzej Mamala ◽

Paweł Kwaśniewski

Keyword(s):

Mechanical Properties ◽

Continuous Casting ◽

Cold Rolling ◽

Aluminium Alloys ◽

Raw Materials ◽

Uniaxial Tensile ◽

Casting Method ◽

Twin Roll Casting ◽

Roll Casting ◽

Twin Roll

Modern manufacturing technologies of flat cold-rolled products made of aluminium and its alloys are based on raw materials produced with the use of continuous casting technology. One of the most frequently used integrated production processes, based on continuous casting of metal, is twin roll casting method (TRC). In TRC method liquid metal flows into the area formed by two water-cooled rolls, solidifies and next is deformed (rolled) which allows to obtain strip with several millimetres thickness. Thanks to this, it is possible to eliminate hot rolling stage from the typical production technology, and directly subject obtained sheets to cold rolling process.This paper presents results of cold rolling strain dependency on the mechanical properties of tested aluminium alloys from 1XXX, 3XXX and 8XXX series, produced in the laboratory conditions with the use of TRC method. Furthermore the rolling loads and basic mechanical properties, determined in an uniaxial tensile, were examined.

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Influence Research of Al and Zn Addition for Twin Roll Casting Magnesium During Multi-Pass Hot Rolling

Science of Advanced Materials ◽

10.1166/sam.2020.3703 ◽

2020 ◽

Vol 12 (5) ◽

pp. 685-692 ◽

Cited By ~ 1

Author(s):

Jia Yao ◽

Min Zha ◽

Huiyuan Wang ◽

Wei Lu

Keyword(s):

Hot Rolling ◽

Texture Evolution ◽

Az31 Alloy ◽

Thickness Reduction ◽

Twin Roll Casting ◽

Texture Intensity ◽

Pinning Effect ◽

Roll Casting ◽

Zn Addition ◽

Twin Roll

This study was aimed at revealing the influence of Al and Zn additions on microstructure, texture evolution and mechanical properties of twin roll casting Mg during multi-pass hot rolling. Firstly, both pure Mg and AZ31 sheets were rolled 9 passes with ∼80% thickness reduction. More effective grain refinement in AZ31 compared to pure Mg after hot rolling, which caused by the pinning effect from fine Mg17Al12 particles present in AZ31 alloy. Meanwhile a strong basal texture gradually formed with increasing thickness reduction in pure Mg. With Al and Zn adding, the texture intensity of AZ31 was much lower than pure Mg in each rolling-pass. The 5th AZ31 sample features a maximum intensity of ∼12.9, which is reduced by 50.6% as compared to the value of ∼26.1 for pure Mg. Compared to pure Mg, the Al and Zn solutes and weakened texture in AZ31 favor the strong work hardening, which promotes a simultaneous high ultimate tensile strength of ∼270 MPa and ductility of ∼22% in the 5th AZ31 sample. The results will be helpful for the TRCed Mg alloys with huge potential for industrial application.

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Twin roll casting of aluminium alloys

Materials Science and Engineering A ◽

10.1016/s0921-5093(99)00676-0 ◽

2000 ◽

Vol 280 (1) ◽

pp. 116-123 ◽

Cited By ~ 114

Author(s):

M Yun ◽

S Lokyer ◽

J.D Hunt

Keyword(s):

Aluminium Alloys ◽

Twin Roll Casting ◽

Roll Casting ◽

Twin Roll

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Microstructure and Texture Evolution during Twin-Roll Casting and Annealing of a Mg–6.8Y2.5Zn–0.4Zr Alloy (WZ73)

Crystals ◽

10.3390/cryst10060513 ◽

2020 ◽

Vol 10 (6) ◽

pp. 513 ◽

Cited By ~ 1

Author(s):

Kristina Kittner ◽

Madlen Ullmann ◽

Falko Arndt ◽

Rudolf Kawalla ◽

Ulrich Prahl

Keyword(s):

Grain Boundaries ◽

High Temperatures ◽

Texture Evolution ◽

Cast State ◽

Twin Roll Casting ◽

Roll Casting ◽

Average Grain Size ◽

Different Temperatures ◽

Twin Roll Cast ◽

Twin Roll

In the present work, the microstructure and texture of a Mg–6.8Y–2.5Zn–0.4Zr sheet manufactured by twin-roll casting were investigated. The twin-roll cast state consisted of two apparent phases: the α-Mg matrix, which was made up of dobulites with an average grain size of approximately 50 µm and the LPSO (long-period stacking ordered) phase, which formed network-like precipitates along the grain boundaries. After twin-roll casting, annealing was carried out under conditions of different temperatures ranging from 450 °C to 525 °C and holding times between 2 h and 24 h. It was found that heat treatment led to the formation of a microstructure in which grains were apparent. Furthermore, it could be observed that high temperatures > 500 °C led to changes in the morphology of the LPSO structures. On one hand, the network-like structure dissolved while, on the other hand, both rodlike and blocky LPSO phases precipitated predominantly at the grain boundaries of the α-Mg matrix. This process was fostered by high temperatures and long holding times.

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Microdefects formation during the twin-roll casting of Al–Mg–Mn aluminium alloys

Journal of Materials Processing Technology ◽

10.1016/j.jmatprotec.2004.09.084 ◽

2005 ◽

Vol 167 (1) ◽

pp. 62-72 ◽

Cited By ~ 58

Author(s):

Ch. Gras ◽

M. Meredith ◽

J.D. Hunt

Keyword(s):

Aluminium Alloys ◽

Twin Roll Casting ◽

Roll Casting ◽

Twin Roll

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Comparison of Precipitates and Texture Evolution in Nb-Bearing Grain-Oriented Silicon Steel Produced by Conventional Processing and Novel Twin-Roll Casting

Metals ◽

10.3390/met10081085 ◽

2020 ◽

Vol 10 (8) ◽

pp. 1085

Author(s):

Yang Wang ◽

Yuanxiang Zhang ◽

Feng Fang ◽

Xiang Lu ◽

Guo Yuan ◽

...

Keyword(s):

Texture Evolution ◽

Secondary Recrystallization ◽

Niobium Nitride ◽

Silicon Steel ◽

Electron Backscattered Diffraction ◽

Twin Roll Casting ◽

Roll Casting ◽

Transmission Electron ◽

New Type ◽

Twin Roll

The Nb-bearing grain-oriented silicon steel sheets were produced by conventional route and novel twin-roll casting route, respectively. The microstructure, texture and precipitate evolution were comparatively investigated by using electron backscattered diffraction (EBSD) and transmission electron microscope (TEM). The findings revealed that the precipitation behavior and the texture evolution were totally different between the two processing routes. In the conventional route, a great number of nanoscale niobium nitride particles (NbN), which acted as mainly grain growth inhibitors were precipitated during hot rolling, while in the twin-roll casting route, due to the rapid solidification, the precipitation of NbN were suppressed and a new type Nb-bearing precipitate enriched with sulfur element was observed in the as-cast strip. Besides, the primary recrystallized texture of conventional specimens was characterized by strong γ-fiber with a peak at {111} <110>, together with very few Goss components. While in the case of twin-roll casting specimens, the strongest primary recrystallized texture was {111} <112> texture and the area fraction of Goss component was much higher than that of conventional specimens. After final high temperature annealing, complete secondary recrystallization was obtained in twin-roll casting specimens and the magnetic induction of B8 was 0.1 T higher than that of conventional specimens.

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