Effect of Processing Route on Microstructure and Microhardness of Low-Carbon Steel Subjected to Drece Process

Pastrňák, Martin; Hilšer, Ondřej; Rusz, Stanislav; Reška, Vladislav; Szkandera, Pavel; Zabystrzan, Rostislav

doi:10.37904/metal.2021.4120

Cited by 4 publications

(6 citation statements)

References 5 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%

“…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. As a result of the accumulation of strain, microstructural changes occur, which lead to an increase in the strength characteristics of the extruded strip [15]. A schematic representation of the SPD method of DRECE is shown in…”

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%

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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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“…The most commonly used material in the Czech Republic is DC04 killed steel, which is produced by continuous casting and hot rolling [3]. The mechanical properties of sheet metal can be increased in some applications, for example, by the unconventional forming method DRECE (Dual Rolls Equal Channel Extrusion) [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

DEsign of stamping drawing technology from thin sheet

Čada

Pektor

2022

METAL 2022 Conference Proeedings

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The paper deals with the design of the technology for the production of the cover stamping to achieve the minimum cost of one piece of the produced component. By calculation, the minimum values of the radius of curvature of the edge of the draw die and the edge of the draw punch were determined to eliminate the calibration operation. The shape and dimensions of the blank for the cover stamping were determined by several methods and then compared. Simulations of the drawing process allowed the locations with the greatest thinning to be analyzed and the drawability of the stamping from each alternative of the blank shape to be verified. The results of the simulations showed the highest suitability of the blank determined by the Autodesk Inventor program and also by the BSE module in Dynaform. The simulation results further demonstrated the necessity to increase the radii of curvature of the drawing edge of both the draw die and the draw punch to a value of 4 mm, which allows the fabrication of a defect-free cover stamping without the need for subsequent calibration. The use of the simulation program in the technological preparation phase of production allowed one to optimise the drawing process by a suitable design of the shape of the blank and also allowed one to design a change in the shape of the stamping which eliminated the formation of cracks at its bottom during drawing.

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Effect of Processing Route on Microstructure and Microhardness of Low-Carbon Steel Subjected to Drece Process

Cited by 4 publications

References 5 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

DEsign of stamping drawing technology from thin sheet

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