Mechanical properties of the AlSi1MgMn aluminium alloy (AA6082) processed by gradation rolling

Neugebauer, Reimund; Sterzing, Andreas; Bergmann, Markus

doi:10.1002/mawe.201100836

Cited by 8 publications

(6 citation statements)

References 16 publications

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“…2D axisymmetric, explicit FE-simulations have been implemented by using FE-Software Abaqus version 6.14.4 in order to estimate changes in residual stress distribution due the die geometry designs. The tools are defined as rigid bodies with combined friction model of Coulomb and factor model according to Tresca (μ 0.2, m 0.1 [16]). The flow curves for the material 1.4301 applied in the FE-simulations were determined experimentally by compression tests on the Gleeble System 3800 for different temperatures and strain rates and were extrapolated for higher degrees of deformation and isotropic work hardening effect using the Swiftapproach.…”

Section: Methodsmentioning

confidence: 99%

Concept for controlled adjustment of residual stress states in semi-finished products by gradation extrusion

et al. 2021

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The residual stress distribution in extruded components and wires after a conventional forming process is frequently unfavourable for subsequent processes, such as bending operations. High tensile residual stresses typically occur near the surface of the wire and thus limit further processability of the material. Additional heat treatment operations or shot peening are often inserted to influence the residual stress distribution in the material after conventional manufacturing. This is time and energy consuming. The research presented in this paper contains an approach to influence the residual stress distribution by modifying the forming process for wire-like applications. The aim of this process is to lower the resulting tensile stress levels near the surface or even to generate compressive stresses. To achieve these residual compressive stresses, special forming elements are integrated in the dies. These modifications in the forming zone have a significant influence on process properties, such as degree of deformation and deformation direction, but typically have no influence on the diameter of the product geometry. In the present paper, the theoretical approach is described, as well as the model set-up, the FE-simulation and the results of the experimental tests. The characterization of the residual stress states in the specimen was carried out by X-ray diffraction using the sin2Ψ method.

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Section: Methodsmentioning

confidence: 99%

Concept for controlled adjustment of residual stress states in semi-finished products by gradation extrusion

et al. 2021

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“…The tensile test provides significant mechanical properties, yield strength (YS), ultimate tensile strength (UTS), uniform elongation (UE), total elongation (TE) and n value (n) of the tested materials [67]. In this research, UTS and TE are two critical factors that are frequently used to compare and select materials.…”

Section: Tensile Testmentioning

confidence: 99%

Processing, Microstructures and Properties of Ultra-High Strength, Low Carbon and V-Bearing Dual-Phase Steels Produced on Continuous Galvanizing Lines

Wu¹,

DeArdo²

2018

Contributed Papers From MS&T17

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One of the most popular elements in weight reduction programs in the automotive industry is high strength zinc coated dual-phase steel produced on continuous hot dipped galvanizing lines. The high strength is needed for mass reduction, while the protective zinc coating is needed to prevent corrosion of the thin gage cold rolled steel. The present study was aimed to explore an optimized way to produce such dual-phase steels with ultra-high tensile strength (UTS > 1280MPa), good global ductility (TE > 18%), excellent local ductility (sheared-edge ductility, HER > 40%) and products of UTS × TE > 22000 MPa × %, conforming to data of AHSS Generation III steel. A steel of this kind is referred to as a third-generation advanced high strength steel. By altering chemical compositions (0.15wt.% carbon), pre-annealing conditions (different hot band coiling temperatures and cold reductions), annealing conditions (different intercritical annealing temperatures) and annealing paths (standard galvanizing or supercool processing), this study set out to investigate the effects of these factors on the microstructures and mechanical properties of dual-phase steels. Results showed that the stored energy of cold rolled steel with 0.15wt.% carbon was much higher than that of carbon containing 0.1wt.% carbon, generating numerous lattice defects during deformation and providing more driving force for formation of austenite and v recrystallization of ferrite during the intercritical anneal. In addition, it was found that the volume fraction of martensite increased with the combination of low coiling temperature, high cold reduction, and high annealing temperature, thereby increasing the tensile strength. Furthermore, the microstructural analysis and tensile testing results and showed that the tensile strength of dual-phase steel with 0.15Wt.% carbon, combined with the ultrafine microstructures (average ferrite grain sizes reached 1-2µm) could approach 1300MPa without loss of ductility and with hole expansion ratios, in some cases, reaching 35%. Since the relative hardness of the hard martensite and soft ferrite is important in controlling sheared-edge ductility, the nanohardness results of these phases were measured. It was revealed that the martensite hardness decreased with increasing volume fraction, at a given carbon content, indicating the tensile strength was independent of the martensite hardness. Other mechanical properties, such as yield strength, YS/UTS ratio, hardness and work hardening behavior, of dual-phase steels controlled by the factors mentioned above were correlated to the microstructural features. The hypothesis that the bulk carbon content would be a major factor in controlling the strength of these steels was vindicated by the results of this study.

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“…One approach for influencing the residual stress distribution during the forming process lies in applying methods of gradation rolling and gradation extrusion, which have been developed to create materials with tailored properties [ 15 , 16 ]. Gradation extrusion appears to be particularly suitable, with additional severe plastic deformation (SPD) elements being integrated into the die.…”

Section: Introductionmentioning

confidence: 99%

Adjusting the Residual Stress State in Wire Drawing Products via In-Process Modification of Tool Geometries

et al. 2021

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After conventional forming processes, the residual stress distribution in wires is frequently unfavorable for subsequent processes, such as bending operations. High tensile residual stresses typically occur near the wire surface and normally limit further processability of the material. Additional heat treatment operations or shot peening are often used to influence the residual stress distribution in the material after conventional manufacturing, which is time- and energy-consuming. This paper presents an approach for influencing the residual stress distribution by modifying the forming process, especially regarding die geometry. The aim is to reduce the resulting tensile stress levels near the surface. Specific forming elements are integrated into the dies to achieve this residual stress reduction. These modifications in the forming zone have a significant influence on process properties, such as plastic strain and deformation direction, but typically do not influence product geometry. This paper describes the theoretical approach and model setup, the FE simulation, and the results of the experimental tests. The characterization of the residual stress states in the specimen was carried out through X-ray diffraction using the sin2Ψ method.

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Mechanical properties of the AlSi1MgMn aluminium alloy (AA6082) processed by gradation rolling

Cited by 8 publications

References 16 publications

Concept for controlled adjustment of residual stress states in semi-finished products by gradation extrusion

Concept for controlled adjustment of residual stress states in semi-finished products by gradation extrusion

Processing, Microstructures and Properties of Ultra-High Strength, Low Carbon and V-Bearing Dual-Phase Steels Produced on Continuous Galvanizing Lines

Adjusting the Residual Stress State in Wire Drawing Products via In-Process Modification of Tool Geometries

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