Experimental and numerical investigation of dual phase steels formability during laser-assisted hole-flanging

Motaman, S. Amir H.; Komerla, Krishna Chaitanya; Storms, T.; Prahl, Ulrich; Brecher, Ch.; Bleck, Wolfgang

doi:10.1063/1.5034894

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…Motaman et al, on the other hand, investigated the effects of heat treatments with a laser beam on the hole-flanging method with their analysis and experimental studies. They applied heat treatment to the deformation region of the DP1000 sheet metal material with a laser beam and then formed it directly [29]. In another study by Al-Obaidi et al, the formability of 0.9 mm thick DP980 sheet metal material by induction heating was investigated.…”

Section: Introductionmentioning

confidence: 99%

The effects of laser-assisted heat treatment on warm formability of dual-phase materials

Karaağaç

Kabakçi

Başdoğan³

2023

Ironmaking & Steelmaking

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In this study, the effects of local heat treatment using a low-power laser on the bending formability of DP800 sheet material were experimentally investigated. In the first step of the study, only the punch contact bending region of sheet metal was locally heated with a constant feed rate (1 mm s −1 ) and at different laser powers (50, 75, and 100% Watt). In the next step, the sheet material was transferred to the bending die for bending without any cooling process, and into the last stage, the sheet material was formed in different angled V-bending dies (30°, 60°, and 90°). It was observed that in heating up to 75-W power, the hardness decreased to 237 HV due to the dissolution of the martensite in the microstructure of DP material, and the springback value decreased by 39.285% due to the decrease in hardness.

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Section: Introductionmentioning

confidence: 99%

The effects of laser-assisted heat treatment on warm formability of dual-phase materials

Karaağaç

Kabakçi

Başdoğan³

2023

Ironmaking & Steelmaking

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“…The tensile strength and breaking toughness of the formed flanges increased by 7.4% and 33% compared to flanges formed by the cold working process. Motaman et al [9] explored laser-assisted heating of the blank edge to increase formability. The blanks were heated to about 400°C and flanges with an HER of 3.3 were formed.…”

Section: Introductionmentioning

confidence: 99%

Increasing the Forming Limits in Hole Flanging of Dual-Phase (DP) 1000 Steel Using Punch Rotation

Besong

Buhl

Härtel

et al. 2022

KEM

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Dual-phase (DP) steels are widely used in sheet metal stamping. However, they are typically characterized by low hole expansion ratios. Since hole flanging is very often applied to sheet metal parts, solutions for improving hole flangeability are needed. In this study, high-speed punch rotation is applied in hole flanging of DP 1000 to generate frictional heat and increase formability. The flanges were formed using a punch rotating at 8000 rev/min and varying axial feeds. A maximum hole expansion ratio (HER) of 3.6 is obtained in the tests compared to ~1.58 in conventional hole flanging. The high formability is explained by the high temperature recorded in the process. The effects of temperature and strain rate on the formability of DP 1000 are examined by tensile tests conducted at different conditions. The tensile tests show an increase in formability at high temperatures. Optical microscopy at the flange edge reveals a change in the microstructure of the steel from the characteristic dual phase to a martensitic structure with elongated grains.

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“…Groche and Erhardt [11] demonstrate an enhancement of the expansion ratio during laser assisted warm (~ 200 °C) hole-flanging of magnesium and aluminum sheets as well as a difference in strain hardening between the inner and the outer surface of the collar. Motaman et al [12] improved the expansion ratio during laser-assisted warm (~250 °C to 400 °C) hole-flanging of DP1000 sheet material in a progressive-die by taking advantage of dynamic strain aging. Cheng [13] developed a onestep hot stamping-forging method that enables the hole-flanging of high strength quenchable steel sheet 15B22.…”

Section: Introductionmentioning

confidence: 99%

Control-Oriented Characterization of Product Properties during Hot Hole-Flanging of X46Cr13 Sheet Material in a Progressive-Die

Martschin

Meya

Klöser

et al. 2021

Metals

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Robust and versatile production is enabled by a closed-loop control of product properties. This essentially relies on the characterization of the interaction between properties and available degrees of freedom to control the process. In particular, this work examines the setting of collar height, thinning, curvature, and hardness during hot hole-flanging of X46Cr13 sheet material with simultaneous heat treatment to identify approaches for a closed-loop property control in hot hole-flanging during multi-stage hot sheet metal forming. To scrutinize the adjustability of the hardness of X46Cr13 sheet material by heat treatment with rapid heating and short dwell times, quenching tests with austenitizing temperatures from 900 to 1100 °C and dwell times from 1 to 300 s were carried out. A hardness between 317 and 680 HV10 was measured. By analyzing the force-displacement curve and the contact situation between tools and blank during hot hole-flanging, an understanding for the process was established. To determine the adjustability of geometrical collar properties and the hardness of the collar, collars were formed at punch speeds between 5 and 100 mm/s and at different temperatures. Here, a dependency of the geometry of the collar on temperature and punch speed as well as setting of the hardness was demonstrated.

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Experimental and numerical investigation of dual phase steels formability during laser-assisted hole-flanging

Cited by 5 publications

References 7 publications

The effects of laser-assisted heat treatment on warm formability of dual-phase materials

The effects of laser-assisted heat treatment on warm formability of dual-phase materials

Increasing the Forming Limits in Hole Flanging of Dual-Phase (DP) 1000 Steel Using Punch Rotation

Control-Oriented Characterization of Product Properties during Hot Hole-Flanging of X46Cr13 Sheet Material in a Progressive-Die

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