The tribological behaviour of AA5083 alloy plastically deformed at warm forming temperatures

Gali, O.A.; Riahi, A.R.; Alpas, A.T.

doi:10.1016/j.wear.2012.12.048

Cited by 27 publications

(12 citation statements)

References 27 publications

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“…Most of the friction tests, are able to capture the COF values of tool-workpiece interfaces by controlling critical parameters, such as lubrication conditions [19,20,62,112], microgeometry of contact (surface roughness of sheet and tools surfaces) [50,53,91], contact pressures [40,90], temperature [42,46,47,81], tool material and coating applied [21,22,38,45], and sliding velocity [33]. The multitude of parameters and phenomena affecting frictional resistance means that the results obtained in various tribological tests are not comparable [35].…”

Section: Discussionmentioning

confidence: 99%

“…where θ is the angle of contact between specimen and roller/pin. Gali et al [81] developed the hot forming friction measurement setup (Figure 21). This tribometer is capable of measuring the COF between the pin and a metallic strip contact stretching at different strain rates and temperatures.…”

Section: Friction Conditions In Die Curvaturementioning

confidence: 99%

“…They additionally installed a camera system over the top face of the strip to measure changes in the initial diameter of circular grids inscribed on the strip's surface and then used it for in-situ evaluation of the major and minor strains in the hot zone. The results of testing AA5083 aluminum alloy sheets at different temperatures showed that COF increased, and this can be attributed to the effects of softening tribolayer at high temperature and abrasion at low temperature [81]. While forming the draw pieces with complex shapes, such as car bodies, it is important to utilize dies having varying outline curvatures.…”

Section: Friction Conditions In Die Curvaturementioning

confidence: 99%

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Recent Developments and Trends in the Friction Testing for Conventional Sheet Metal Forming and Incremental Sheet Forming

Trzepieciński

Lemu

2019

Metals

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Friction is the main phenomenon that has a huge influence on the flow behavior of deformed material in sheet metal forming operations. Sheet metal forming methods are one of the most popular processes of obtaining finished products, especially in aerospace, automobile, and defense industries. Methods of sheet forming are carried out at different temperatures. So, it requires tribological tests that suitably represent the contact phenomena related to the temperature. The knowledge of the friction properties of the sheet is required for the proper design of the conditions of manufacturing processes and tools. This paper summarizes the methods used to describe friction conditions in conventional sheet metal forming and incremental sheet forming that have been developed over a period of time. The following databases have been searched: WebofKowledge, Scopus, Baztool, Bielefield Academic Search Engine, DOAJ Directory of Open Access Journals, eLibrary.ru, FreeFullPdf, GoogleScholar, INGENTA, Polish Scientific Journals Database, ScienceDirect, Springer, WorldCat, WorldWideScience. The English language is selected as the main source of review. However, in a limited scope, databases in Polish and Russian languages are also used. Many methods of friction testing for tribological studies are selected and presented. Some of the methods are observed to have a huge potential in characterizing frictional resistance. The application of these methods and main results have also been provided. Parameters affecting the frictional phenomena and the role of friction have also been explained. The main disadvantages and limitations of the methods of modeling the friction phenomena in specific areas of material to be formed have been discussed. The main findings are as follows—The tribological tests can be classified into direct and indirect measurement tests of the coefficient of friction (COF). In indirect methods of determination, the COF is determined based on measuring other physical quantities. The disadvantage of this type of methods is that they allow the determination of the average COF values, but they do not allow measuring and determining the real friction resistance. In metal forming operations, there exist high local pressures that intensify the effects of adhesion and plowing in the friction resistance. In such conditions, due to the plastic deformation of the material tested, the usage of the formula for the determination of the COF based on the Coulomb friction model is limited. The applicability of the Coulomb friction model to determine the COF is also very limited in the description of contact phenomena in hot SMF due to the high shear of adhesion in total contact resistance.

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Section: Discussionmentioning

confidence: 99%

Section: Friction Conditions In Die Curvaturementioning

confidence: 99%

Section: Friction Conditions In Die Curvaturementioning

confidence: 99%

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Recent Developments and Trends in the Friction Testing for Conventional Sheet Metal Forming and Incremental Sheet Forming

Trzepieciński

Lemu

2019

Metals

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“…Gali et al developed the hot forming friction measurement setup as shown in Fig. 14 [79]. According to the figure, a strip was placed around the rotating heater (25-250 °C ) and pulled on both ends by the tensile force.…”

Section: Tribometers For Sheet Metal Formingmentioning

confidence: 99%

Tribology in metal forming at elevated temperatures

et al. 2015

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Abstract:The tribo-characteristics of metal forming at high temperatures have not yet been well understood due to the complex nature of thermal, microstructural, interaction, and process parameters. This is a review paper on the effects of temperature, coating, and lubrication to the tribological characteristics in hot forming as well as the tribometers for different metal forming processes at elevated temperatures mainly based on the experimental work. The tribological behaviors of oxides in hot forming, such as rolling and stamping, were reviewed and presented. Some commonly used surface coatings and lubricants in hot forming were given. Many types of tribometer were selected and presented and some of them provided a great potential to characterize friction and wear at elevated temperatures. Nevertheless, more testing conditions should be further investigated by developing new tribometers. Eventually, experimental results obtained from reliable tribometers could be used in theory and model developments for different forming processes and materials at high temperatures. The review also showed the great potential in further investigations and innovation in tribology.

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“…The first observation was a series of parallel streaks resembling fibers which have been seen in other studies and are an indication of the presence of surface oxides. [23,24] The second was a series of lines or wrinkles. These wrinkles were typically located surrounding the edges of intermetallic particles.…”

Section: Observations Of the Aa3003 Chill Cast Surfacementioning

confidence: 99%

Interface Formation During Fusion™ Casting of AA3003/AA4045 Aluminum Alloy Ingots

Ciano

Caron

Weckman

et al. 2015

Metall Mater Trans B

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Fusionä casting is a unique Direct Chill continuous casting process whereby two different alloys can be cast simultaneously, producing a laminated ingot for rolling into clad sheet metal such as AA3003/AA4045 brazing sheet. Better understanding of the wetting and interface formation process during Fusionä casting is required to further improve process yields and also explore use of other alloy systems for new applications. In this research, AA3003-core/AA4045-clad ingots were cast using a well-instrumented lab-scale Fusionä casting system. As-cast Fusionä interfaces were examined metallurgically and by mechanical testing. Computational fluid dynamic analyses of the Fusion TM casts were also performed. It was shown that the liquid AA4045-clad alloy was able to successfully wet and create an oxide-free, metallurgical, and mechanically sound interface with the lightly oxidized AA3003-core shell material. Based on the results of this study, it is proposed that the bond formation process at the alloys interface during casting is a result of discrete penetration of AA4045 liquid at defects in the preexisting AA3003 oxide, dissolution of underlying AA3003 by liquid AA4045, and subsequent bridging between penetration sites. Spot exudation on the AA3003 chill cast surface due to remelting and inverse segregation may also improve the wetting and bonding process.

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The tribological behaviour of AA5083 alloy plastically deformed at warm forming temperatures

Cited by 27 publications

References 27 publications

Recent Developments and Trends in the Friction Testing for Conventional Sheet Metal Forming and Incremental Sheet Forming

Recent Developments and Trends in the Friction Testing for Conventional Sheet Metal Forming and Incremental Sheet Forming

Tribology in metal forming at elevated temperatures

Interface Formation During Fusion™ Casting of AA3003/AA4045 Aluminum Alloy Ingots

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