Development of geometry of forming tools for extrusion of strip sheet by SPD process

Rusz, Stanislav; Salajka, Michal; Džugan, Ján; Hilšer, Ondřej; Boruta, J.; Pastrňák, Martin; Švec, Jiří

doi:10.1088/1757-899x/179/1/012061

Cited by 3 publications

(4 citation statements)

References 6 publications

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“…The quality properties of the DX56D + Z100-M-C-O material are de ned by the standard STN EN ISO 10346 (Continuous heat-dip coated at steel products) [16]. It is an alloyed noble low-carbon ferritic steel micro-alloyed with titanium (the standard prescribes a maximum amount of 0.3 wt%), which serves as a carbonitriding stabiliser to completely pure ferrite from interstitially dissolved C and N. [17][18][19][20] Reducing the content of these elements increases the value of normal anisotropy and guarantees better deep drawing properties. Titanium forms TiCN inclusions with carbon and nitrogen, which can be seen as sharp yellow edges in the material under microscopic observation on an Olympus LEXT OLS 3000 microscope, see Fig.…”

Section: Experimental Materials and Methodsmentioning

confidence: 99%

Effect of tool speed on FLC curve position for DX56D

Novák

Tatíček²

2023

Preprint

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Experimentally determined forming limit curves (FLC) are often used to evaluate formability in sheet metal forming. These curves represent the limits of the formability of the material. The most widely used procedure for the experimental determination of the breaking point of sheet metal is formulated in EN ISO 12004-2. The FLC curve was measured for material DX56D + Z100-M-C-O using the Nakajima test on a BUP 600 universal test machine. The test setup and sample shape correspond to EN ISO 12004-2 except for the punching speed, which was increased from 2 mm/s to 10, 14, and 17 mm/s against the conditions defined in the standard. A non-contact optical system ARAMIS from GOM was used to measure the deformation. A stochastic pattern was applied to the samples to ensure the quality of the measurements, and the Erichsen adhesion test was performed. To determine other properties of the material, the microstructure of the material in the fracture area was observed in the metallographically prepared samples. During analysis, the microstructure was monitored with regard to the state of deformation (deep drawing, plane deformation, and more axial stress). Observations were made on samples with an etched structure using an optical microscope and an electron microscope, where, among other things, the distribution of particles, their size, and chemical composition were observed.

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Section: Experimental Materials and Methodsmentioning

confidence: 99%

Effect of tool speed on FLC curve position for DX56D

Novák

Tatíček²

2023

Preprint

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“…The DRECE method (Dual Rolls Equal Channel Extrusion) [2,3,4,7,13,15] is based on the principle of angular extrusion through an equilateral channel using contact friction between the extruded blank, in the form of a metal strip, and feed rollers. Based on the generated friction force, the strip is continuously extruded into a special forming tool, where is intensively deformed by shear strain as passes through the deformation zone.…”

Section: Principle Of Drece Methodsmentioning

confidence: 99%

“…This significance was recognized several years ago and led to the concept of nanocrystalline materials which were discussed in detail in an early review [1,12,14]. A possible way for microstructure refinement of metals is the use of SPDprinciple on the base of thermomechanical processing [2,3,4,7,13,15]. It is important to note that the shape of the sample is retained in SPD processing by the use of special tool geometries which effectively prevent free flow of the material and thereby produce a significant hydrostatic pressure which leads to a high density of dislocations and consequent grain refinement [9,10].…”

Section: Introductionmentioning

confidence: 99%

DRECE forming method as a way to improve metals and alloys for advanced structural and functional application

Zabystrzan

Švec

Szkandera

et al. 2022

METAL 2022 Conference Proeedings

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The creation of UFG (ultra-fine grain) materials is a new and promising way to improve metals and alloys for advanced structural and functional application. To date, it is common knowledge that UFG materials can be successfully produced by intense plastic deformation. Severe plastic deformation (SPD) is one of the most effective techniques to improve the physical and mechanical properties of metallic materials through structural refining for UFG and nano-crystalline (NC) states. One of the approaches that has been the subject of basic and applied research for two decades is the preparation of materials with UFG structure with a grain size below 1000 nm. Such materials will find use primarily where they use stress, while preserving the required plasticity, it will be due to the reduction of the weight of the structure, which will also contribute to the preservation of its safety (steel is used in the automotive industry, steel for engineering, of non-ferrous alloys in the aerospace industry), or high strength and hardness in combination with biocompatibility ensures greater life of the products (titanium implants, etc.). Some ultra-fine-grained steels are already introduced in mass production, while the expected properties are achieved by methods of plastic deformation. These materials include, for example, DC01 and DC03, which will be analyzed in the following article after several passes through the DRECE method. The DRECE forming process is based on extrusion technology with zero change in crosssection dimensions with the ultimate goal of achieving a high degree of deformation in the formed material. With the help of severe plastic deformation of the material, a substantial refinement of the structure of the material is achieved. The following article will deal mainly with the influence of the DRECE forming speed on the hardness and microstructure of the material of the sheet metal blank for DC01 and DC03 steel.

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“…Multiple plastic deformations carried out this way influence the change of the structure and mechanical properties in relation to the initial material. The decisive factor for increasing mechanical properties of material after extrusion in the DRECE process is selection of the optimal forming angle in the plastic area (123°, 118° or 108°) determined by the structural arrangement of the forming tool and number of passes through the device [10][11][12][13][14][15]. Fig.…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Kowalczyk¹,

Jabłońska²,

Rusz³

et al. 2018

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This research paper shows the influence of a repeated SPD (Severe Plastic Deformation) plastic forming with the DRECE technique (Dual Rolls Equal Channel Extrusion) on hardening of low carbon IF steel. The influence of number of passes through the device on change of mechanical properties, such as tensile strength TS and yield stress YS, of tested steel was tested. The developed method is based on equal channel extrusion with dual rolls and uses a repeated plastic forming to refinement of structure and improve mechanical properties of metal bands [1-2]. For the tested steel the increase of strength properties after the DRECE process was confirmed after the first pass in relation to the initial material. The biggest strain hardening is observed after the fourth pass.

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Development of geometry of forming tools for extrusion of strip sheet by SPD process

Cited by 3 publications

References 6 publications

Effect of tool speed on FLC curve position for DX56D

Effect of tool speed on FLC curve position for DX56D

DRECE forming method as a way to improve metals and alloys for advanced structural and functional application

Archives of Metallurgy and Materials

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