Fracture criterion for predicting edge-cracking in Hot rolling of twin-roll casted AZ31 Mg alloy

Wang, Jia; Ma, Lifeng; Jiao, Mingyang; Le, Qichi; Han, Tianli; Che, Chaojie

doi:10.1016/j.jmrt.2020.02.103

Cited by 67 publications

(12 citation statements)

References 19 publications

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“…The results showed that the pure copper contact wire began to soften when the temperature reached 200°C, and its hardness decreased rapidly when it was higher than 200°C. On this basis, the changes in the microstructure and cracks of materials caused by severe plastic deformation and process conditions of rolling have received widespread attention [10][11][12]. The application of pulsed currentassisted rolling has simplified the production process and improved the microstructure and property [13,14].…”

Section: Introductionmentioning

confidence: 99%

10 Effect of pulse current on micro-hardness and wear performance of cold-rolled T2 copper sheet

Song

Wei

Mu³

et al. 2020

Mater. Res. Express

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The effect of pulse current assisted rolling on the micro-hardness and wear properties of T2 copper sheet was studied. The micro-hardness of copper sheet with pulse current assisted rolling was measured, and the hardness values of the copper sheet at different deformation rates were obtained. The wear performance of rolled copper sheet was tested by friction and wear tester. The results show that compared with traditional cold rolling, with the increase of deformation rate, the micro-hardness of copper sheet with pulse current assisted rolling increased after an initial decrease. The microhardness reaches the minimum value((82.25±2.5)HV0.1) when the rolling deformation rate reaches 65%. The specific wear rate of the copper sheet reached the maximum(0.00176 mm 3 /N·m) when the deformation rate of the copper sheet was 65%. The copper sheet has a smaller specific wear rate by using pulse current assisted rolling, and the oxygen element of the wear debris has a lower content. This indicates that pulse current assisted rolling can improve the wear resistance and oxidation resistance of copper sheet.

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Section: Introductionmentioning

confidence: 99%

10 Effect of pulse current on micro-hardness and wear performance of cold-rolled T2 copper sheet

Song

Wei

Mu³

et al. 2020

Mater. Res. Express

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“…There are metals and alloys which are of great interest for various industries but are seriously limited in their plasticity. Examples of such metals and their applications are: pure magnesium, magnesium alloy AZ31 (Mg-3Al-1Zn) and thin sheets in the automotive industry [7][8][9]; molybdenum, molybdenum alloys and various parts in aerospace, defense and nuclear industries [10,11]; alloy of uranium with molybdenum U-10Mo and foil for nuclear reactors [12,13]; titanium alloys and various parts for the aircraft industry [14].…”

Section: Hard-to-deform Materials and Areas Of Their Applicationmentioning

confidence: 99%

“…In most cases, the main method for manufacturing semi-finished products from hard-to-deform steels and alloys is hot [1,2,4,5,6,7,9,11,12,13] or cold sheet rolling. It provides high productivity of the process with the opportunity of automation, allows to get the required dimensions of the semi-finished product and to improve the microstructure and mechanical properties of the metal.…”

Section: Hard-to-deform Materials and Areas Of Their Applicationmentioning

confidence: 99%

“…Specialists in the field of metal forming point out several problems associated with sheet rolling of hard-to-deform steels and alloys. One of the main problems is edge cracking of thin sheets during rolling due to the inherent low plasticity of such materials [2,3,4,5,7,9,12,13,15,16,17,18,19]. Among the factors influencing the plasticity of the material, two groups are distinguished: 1) the properties of the material itself: chemical composition, microstructure, type of crystal lattice, number of microstructure phases, structural and chemical heterogeneity, etc.…”

Section: The Main Issues Of Rolling Hard-to-deform Materialsmentioning

confidence: 99%

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Technological Shells in the Processes of Rolling Thin Sheets From Hard-To-Deform Materials

Каманцев²

2021

Preprint

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The present work is devoted to the study of deformability of high-strength and hard-to-deform materials. Today the most promising technology for their forming is a rolling in a ductile shell also known as sandwich rolling. Despite the fact that the use of such technological shells allows to effectively reduce the rolling forces and soften the stress state, they have not got wide application in manufacturing practice due to the accompanying disadvantages. On the basis of finite element (FE) simulation, we carried out an all-around analysis of the effect of shell material on process parameters of method: rolling force, total reduction of hard-to-deform material, deformation inhomogeneity and thickness variation of rolled sheet, stress state scheme. Analysis of computer models allowed us to highlight the main reason for the low efficiency of the known method and propose a new design of technological shells. Preliminary FE-simulation of the rolling process of hard-to-deform material in the new technological shells showed an improvement in process parameters and method efficiency. Approbation was carried out via rolling U12 high-carbon tool steel (Russian analogue of DIN C110W2 tool steel), which has low plasticity and high hardness, on the rolling mill Duo 250 under laboratory conditions. Evaluation according to technological criteria – reducing the rolling force, increase of the total reduction and the deformation uniformity of hard-to-deform material, improvement of its deformability – showed the prospects of using proposed technological shells in manufacturing practice.

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“…Magnesium alloy is the lightest metal structural material in actual engineering, with light specific gravity, high specific strength, excellent thermal and electrical conductivity [ 1 , 2 , 3 , 4 , 5 , 6 ], and the mechanical properties of rolled magnesium alloys are better than those of cast magnesium alloys. Therefore, magnesium alloy rolled sheets are widely used in automobiles, aerospace, and other fields.…”

Section: Introductionmentioning

confidence: 99%

Initiation and Suppression of Crack Propagation during Magnesium Alloy Rolling

et al. 2021

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The conventional rolling of magnesium alloy with a single pass and large reduction will cause severe edge cracking. The sheet without cracks can be achieved by limited width rolling. The microstructure evolution of the sheet with cracks after conventional rolling and the sheet without cracks after limited width rolling is explored, and an effective mechanism for solving edge cracks is proposed. Conventional rolling can fully develop twin evolution due to high deformation, and three stages of twinning evolution can be observed and the secondary twins easily become the nucleation points of micro cracks, resulting in a large number of cracks propagating along the twin lamellae. Cracks terminate at dislocation accumulation because the accumulation of a large number of dislocations can hinder propagation. Dislocation shearing of twins to eliminate the high localization caused by twins and induce the tensile twins to weaken the basal surface texture provides an effective plastic deformation mechanism of crack inhibition, which is useful for expanding the engineering application of magnesium alloy rolled sheets.

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Fracture criterion for predicting edge-cracking in Hot rolling of twin-roll casted AZ31 Mg alloy

Cited by 67 publications

References 19 publications

10 Effect of pulse current on micro-hardness and wear performance of cold-rolled T2 copper sheet

10 Effect of pulse current on micro-hardness and wear performance of cold-rolled T2 copper sheet

Technological Shells in the Processes of Rolling Thin Sheets From Hard-To-Deform Materials

Initiation and Suppression of Crack Propagation during Magnesium Alloy Rolling

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