Effect of asymmetric rolling process on the microstructure, mechanical properties and texture of AZ31 magnesium alloys sheets produced by twin roll casting technique

Ucuncuoglu, Selda; Ekerim, Ahmet; Secgin, Gizem Oktay; Duygulu, Özgür

doi:10.1016/j.jma.2014.02.001

Cited by 43 publications

(23 citation statements)

References 33 publications

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“…This could be due to additional shear deformation and further growth of the recrystallised (REX) grains. Similar results were obtained for hot rolling of magnesium alloys [23]. Using a laboratory rolling mill, as-cast magnesium alloy plates were rolled in both symmetrical and asymmetrical manner at the temperature of 300°C.…”

Section: Microstructuresupporting

confidence: 69%

“…Negligible numbers of scientific papers have been published until the beginning of the year 2000 when ASR became more interesting for research [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. A significant increase in publications has been noticed in the past few years [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. They deal with hot and cold rolling, rolling of steels [13], aluminium [2-6, 8, 12, 16, 20-22, 29, 31, 34], titanium [30], magnesium [16,23] and their alloys, as well as flat, wire [25] and rod rolling [28].…”

Section: Introductionmentioning

confidence: 99%

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Asymmetric rolling process

Fajfar

Lah

Kraner

et al. 2017

Materials and Geoenvironment

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Asymmetric rolling is a novel technique used to control both the texture and the grain refinement of metallic materials. The aim of asymmetric rolling is to apply a large shear strain uniformly through the thickness of the plate, by maintaining a high degree of friction between the sheet and the rolls. It can be used to improve the formability of material. One of the advantages of asymmetrical rolling is that the rolling force and torque can be decreased. The methods used for the asymmetric rolling are single roll drive, different work roll speeds, different work roll diameters or different lubricated work roll surfaces. IzvlečekAsimetrično valjanje je novejša tehnika preoblikovanja, ki se uporablja za kontrolo teksture in za zmanjšanje zrnatosti valjanega materiala. Pri asimetričnem valjanju nastanejo zaradi velikega trenja na stiku valjanega materiala in valjev velike strižne deformacije po celotnem preseku valjanca. S to tehniko se lahko izboljšajo preoblikovalne lastnosti materiala. Ena od prednosti asimetričnega valjanja je tudi zmanjšanje sile in momenta valjanja. Asimetrično valjanje lahko izvajamo na naslednje načine: z le enim gnanim valjem, različnima hitrostima valjev, različnima premeroma valjev ali pa z (ne)uporabo različnih lubrikantov na površini valjev.

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Section: Microstructuresupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Asymmetric rolling process

Fajfar

Lah

Kraner

et al. 2017

Materials and Geoenvironment

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“…It is found that optimization of process parameters of TRC offers the possibility to produce high quality sheet material. Ucuncuoglu et al 7 studied the warm rolling on the AZ31 Mg alloy and it is found that the grain size of 19 µm for the TRC strip is reduced to 10 µm after rolling. Chen et al 8 studied the texture of the Mg alloy processed by TRC and warm rolling.…”

mentioning

confidence: 99%

Effect of Warm Rolling on Microstructure and Mechanical Properties of Twin-roll Casted ZK60 Alloy Sheets

Gong

Kang

et al. 2015

Mat. Res.

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In this study, ZK60 magnesium alloy strips were produced by twin roll casting (TRC) and then subjected to warm rolling at the temperature of 300 °C and 350 °C. Rolled sheets related to different rolling reductions were prepared after sequential warm rolling with the rolling speed of 5 m/min. Microstructures, texture, hardness, tensile properties of the rolled sheets with different rolling reductions were studied experimentally. It has been found that grain refinement occurs actively during the warm rolling. Also, high density of shear bands were observed in the rolled sheets. The warm rolling sheet presents strong (0002) basal texture. In addition, the increase of the rolling reduction results in the improvement of the mechanical properties.

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“…During the twin-roll cast process of Mg alloys at higher temperature, slip occurs predominantly on the basal planes, which leads to their alignment parallel to the direction of metal flow [2]. Consequently, a strong basal texture develops during the production, which means that most of the basal planes {0001} are approximately parallel to the sheet plane [21,29]. At ambient temperature, tensile stress in the sheet plane direction mainly activates basal a slip, whereas compressive stress leads to extensive {1012} 1011 tension twinning [2,5].…”

Section: Introductionmentioning

confidence: 99%

Fatigue modeling for wrought magnesium structures with various fatigue parameters and the concept of highly strained volume

Nischler

Denk

Huber

2020

Continuum Mech. Thermodyn.

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Mechanical fatigue tests of unnotched, notched, and bending twin-roll cast AZ31B magnesium alloy specimens are performed in which strain fields are analyzed with digital image correlation. Clearly, delimited macroscopic bands of twinned grains (BTGs) in which the compressive strain is significantly higher compared to the adjacent regions are observed. Conventional fatigue parameters, e.g., the strain amplitude, exhibited higher values within the BTGs. This findings are confirmed by the fact that for all investigated specimens the initial macroscopic cracks are observed within the BTGs. Consequently, for the presented concept of highly strained volume, fatigue parameters are determined from the highly strained regions with high strain amplitudes. This paper focuses on the application of the effective strain amplitude fatigue parameter decomposed in an elastic and plastic portion, the Smith-Watson-Topper fatigue parameter and energy-based fatigue parameters within the concept of highly strained volume. An extended stress-strain hysteresis model is presented to compute stress-strain hystereses for arbitrary load ratios, required to determine the mentioned fatigue parameters. The application and evaluation of five different fatigue parameters within the concept of highly strained volume demonstrates the accurate description of the fatigue life until failure.

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Effect of asymmetric rolling process on the microstructure, mechanical properties and texture of AZ31 magnesium alloys sheets produced by twin roll casting technique

Cited by 43 publications

References 33 publications

Asymmetric rolling process

Asymmetric rolling process

Effect of Warm Rolling on Microstructure and Mechanical Properties of Twin-roll Casted ZK60 Alloy Sheets

Fatigue modeling for wrought magnesium structures with various fatigue parameters and the concept of highly strained volume

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