Innovative Press Hardened Steel Based Laser Welded Blanks Solutions for Weight Savings and Crash Safety Improvements

Múnera, Daniel Duque; Pic, Aurélien; Abou-Khalil, Damien; Shmit, Francis; Pinard, Fabrice

doi:10.4271/2008-01-1076

Cited by 45 publications

(10 citation statements)

References 1 publication

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“…Besides the intention to achieve higher strengths and thus fully exploit the potential for lightweight construction, there is an increasing demand for steels with higher ductility [9]. These enable targeted energy absorption as a result of plastic crash deformation [1].…”

Section: Methodsmentioning

confidence: 99%

Analysis of process limits for partial hot stamping with controlled pre-cooling by radiation exchange

Reihani,

Donat,

Heibel

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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The increasing demands on part complexity and tailored properties in form of local strength and ductility cannot be achieved with conventionally manufactured hot stamped body components. To meet the requirements of safety-relevant body parts, partial hot stamping is increasingly used in the automotive industry. One approach to achieve tailored properties on hot stamped parts is based on controlled cooling of the blank prior to forming and quenching. The related furnace technology is based on a furnace chamber in which a cooled aluminum mask protects local areas of the blank from thermal radiation while simultaneously absorbing the blank’s own emitted radiation. The sheet thickness and utilized material significantly influence the controlled radiation exchange and present potential process limits. To analyse these lower process limits, blanks made of the materials 22MnB5 AS150 and 8MnB7 AS150 are partially pre-cooled and hot stamped with different sheet thicknesses. In addition, the process is simulated with AutoForm®R10 and validated by the obtained experimental results. The results show that the sheet thickness is a key influencing factor in the process and significantly affects the mechanical properties after partial hot stamping. Especially sheet thicknesses t0 of 2.25 mm can limit the process, as the effectiveness of the radiation exchange for controlled pre-cooling and phase transformation decreases.

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Section: Methodsmentioning

confidence: 99%

Analysis of process limits for partial hot stamping with controlled pre-cooling by radiation exchange

Reihani,

Donat,

Heibel

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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“…(3) Tailor-Welded Blank (TWB): ArcelorMittal developed the use of laser welding to combine blanks of different strengths into an integrated part. Research has shown that the components produced by hot stamping of the TWB can reduce the mass of the component by 20% compared to the normal assembly with the same capacity to absorb crash energy [9]. Shi et al [10] optimized the structure of tailor welded B-pillar and verified the collision performance of B-pillar through vehicle side impact.…”

Section: Introductionmentioning

confidence: 99%

Influence of Die Temperature on Microstructure and Strength-Toughness of B1500HS Steel

She,

Song,

Liu

et al. 2023

Advances in Transdisciplinary Engineering

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In order to optimize the strength-toughness matching of auto body components. Taking B1500HS steel as the research object. The influence of die temperature on the microstructure and properties was studied by hot stamping tests of flat die, mechanical properties tests and microstructure observation tests. The study shows that the microstructure and properties of B1500HS is not sensitive to die temperature below 250°C. When the die temperature is 20–250°C, the tensile strength of B1500HS is above 1400 MPa, while the plastic-toughness is poor; When the die temperature is above 300°C, B1500HS steel begins to generate martensite-bainite phase. As the die temperature increases from 300°C to 550°C, the strength and hardness of B1500HS decrease significantly, while the plastic and toughness have the opposite trend. When the die temperature in 300°C, B1500HS has good strength-toughness. The tensile strength, percentage elongation after fracture, Vickers hardness, and impact toughness values are 1308.26 MPa, 8.18%, 436Hv, and 800.41 KJ·m–2 respectively.

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“…Indeed, if the former have to satisfy more and more restrictive regulations for environmental pollution and greenhouse gas emissions, the latter have to fully optimize the energy usage in order to guarantee longer ranges of autonomy per battery charge [3][4][5][6][7]. For these reasons, the development of lightweight solutions for the vehicle bodyin-white through the application of both more strength materials and tailored blanks technologies is mandatory nowadays [8][9][10]. Consequently, the use of advanced high-strength steels (AHSS), and in particular its subfamily of ultra-high-strength steels (UHSS), is growing much more than forecast due to the capability of these grades of steel to reach lightweighting targets without the critical issues of other alternative materials (e.g., aluminum, magnesium, titanium) [11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Laser welding of tailored blanks made of Al-Si-coated 22MnB5 steel using a filler wire and a variable energy distribution laser optics

Coviello

Heydt²,

Rullo³

et al. 2022

Preprint

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Laser welding of Al-Si coated steels for hot stamping in automotive applications is problematic due to the mixing of the coating layers inside the molten pool that weakens the resulting weld seam. The most common welding procedure used in this case consists in removing the Al-Si layer through laser ablation prior to the joining. Although in-situ ablation of the Al-Si coating can be costly and time consuming, this method continues to be the most widely used by major producers of tailor welded blanks (TWB). In this work, a novel approach consisting in joining as-received (i.e. not decoated) materials using a filler wire and an innovative variable energy distribution (VED) laser optics is introduced and tested on TWB made of 22MnB5. Specimens obtained from a 33 full factorial design of experiment have shown a mechanical resistance much higher than that observed in as-received welded then hot stamped cases. SEM and hardness analyses have been performed to better investigate the quality of the resulting weld seam. Variations of the main process parameters have been considered on an iso-thickness and iso-material configuration, empirically demonstrating the stability and reliability of the proposed methodology as well as its suitability for production purposes.

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Innovative Press Hardened Steel Based Laser Welded Blanks Solutions for Weight Savings and Crash Safety Improvements

Cited by 45 publications

References 1 publication

Analysis of process limits for partial hot stamping with controlled pre-cooling by radiation exchange

Analysis of process limits for partial hot stamping with controlled pre-cooling by radiation exchange

Influence of Die Temperature on Microstructure and Strength-Toughness of B1500HS Steel

Laser welding of tailored blanks made of Al-Si-coated 22MnB5 steel using a filler wire and a variable energy distribution laser optics

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