An Analytical Approach to the Problem of Core Fracture During Extrusion of Bimetal Rods

Avitzur, B.; Wu, R.; Talbert, S.; Chou, Y. T.

doi:10.1115/1.3185994

Cited by 10 publications

(3 citation statements)

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“…Several authors have investigated the manufacturing of different material combinations [4][5][6][7][8]. WANG et al (2022) studied hot forging of bimetallic gears using aluminum (AA6082) and steel (E355).…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Analysis of the Forging of a Bimetallic Crosshead

Rosiak,

Santos,

Alba

et al. 2023

Advances in Materials Science

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The automobile sector has been making increasing efforts to reduce the weight of automobiles, aiming at mitigating pollutant gas emissions. The use of innovative concepts, such as bimetallic components, has become attractive because it makes it possible to increase the strength-to-weight ratio of the components. In this study, the hot forging of a bimetallic crosshead is investigated. In the process, a billet with a cylindrical core of the magnesium alloy AZ61 is enclosed with a hollow cylinder of the aluminum alloy AA 6351 and forged at 400°C. The objective is to reconcile the low density of Mg alloys with the high corrosion resistance of Al alloys. In parallel, a finite element analysis of the process was carried out.

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Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Analysis of the Forging of a Bimetallic Crosshead

Rosiak,

Santos,

Alba

et al. 2023

Advances in Materials Science

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“…This offers the potential to comply with the requirement of weight saving in several fields of industry, e.g., automotive [1] and aeronautical. Therefore, several investigations have been done since the early 1970s on the co-extrusion process with different material combinations [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

A Fragmentation Criterion for the Interface of a Hydrostatic Extruded Al-Mg-Compound

Kirbach

Stockmann

Ihlemann

2018

Metals

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Due to the higher demand for energy efficient products, light-weight constructions have become more important in recent years. An innovative, hydrostatic extruded Al-Mg-compound used here combines the corrosion resistance of aluminium with the outstanding lightweight properties of magnesium. During the production process, a thin boundary layer is built between the two basic materials. Investigations on further hot forming processing revealed a good formability of these compounds despite the fact that the boundary layer splits into fragments during forging and a new secondary boundary layer is built when the basic materials between the fragments come into contact again during the continuous deformation. The aim of the research is now to investigate fragmentation depending on the deformation rate and boundary layer thickness, which increases during the heat-up process in preparation of forging. For this purpose, a channel compression test is used in conjunction with a special newly developed specimen shape. The metallographic evaluation of the boundary layer reveals a strong dependency of fragmentation on the deformation rate and the boundary layer thickness. With the aid of a numerical simulation, an individual critical stretch could be determined at which fragmentation starts, and provide guidance for an optimal forging process design.

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“…The main objective was to achieve a sound metal flow, without fracturing the harder material. Among these works, attention must be paid to an upper bound method-based criterion for core fracture, as developed by Avitzur et al (1982Avitzur et al ( , 1985. According to the criterion, the process variables seriously affecting core fracture include die cone angle, volume fraction of the core, the ratio of the flow stress of the core to the flow stress of the sleeve, friction factor, and the reduction in area.…”

Section: Introductionmentioning

confidence: 99%

Influence of die geometric parameters on plastic flow of layer composites during extrusion process

Nowotyńska

Smykla

2009

Journal of Materials Processing Technology

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An Analytical Approach to the Problem of Core Fracture During Extrusion of Bimetal Rods

Abstract: The process of core fracture in bimetals during extrusion was reexamined. The new analysis, based on the upper-bound theorem in limit analysis, eliminated the lengthy numerical computations employed in the previous work [1]. The criterion for core fracture was derived and discussed.

Cited by 10 publications

References 0 publications

Numerical and Experimental Analysis of the Forging of a Bimetallic Crosshead

Numerical and Experimental Analysis of the Forging of a Bimetallic Crosshead

A Fragmentation Criterion for the Interface of a Hydrostatic Extruded Al-Mg-Compound

Influence of die geometric parameters on plastic flow of layer composites during extrusion process

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