Experimental investigation of distortion behavior of laser heat treated blanks

Rigas, Nikolaos; Merklein, Marion

doi:10.1016/j.procir.2020.09.074

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…A correlation between the laser beam size and the deformation behavior was found for sheets with a thickness of 1 mm. For thicker sheets, the influence of the laser beam size decreased significantly [18].…”

Section: Theoretical Approachmentioning

confidence: 96%

“…1 The distorted workpiece after profile grinding in the V-groove with the considered thermal compensation strategy in production for sheet metals [16] as well as for profiles [17]. The forming of high-strength alloys was investigated by Rigas and Merklein [18]. A correlation between the laser beam size and the deformation behavior was found for sheets with a thickness of 1 mm.…”

Section: Theoretical Approachmentioning

confidence: 99%

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Modeling of laser processing as a distortion compensation strategy for profile grinding

Schieber

Hettig

Muller

et al. 2022

Prod. Eng. Res. Devel.

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In this paper, the possibility of using laser machining on long slim steel workpieces, such as linear guide rails, was investigated to selectively induce tensile residual stresses. The approach will be used to counteract the residual stresses in a V-groove after profile grinding and to compensate for workpiece distortion. Experimental data with a variation of laser power and feed rate were used to calibrate a finite element simulation so that a valid predictive model could be built. Decisive factors were the distortion values as well as metallographic investigations. Relevant results are the numerical design of suitable strategies for targeted distortion potential induction and an advanced understanding of thermal treatment by laser processing. The completed successful modeling of the process strategy can be used for distortion compensation during profile grinding.

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Section: Theoretical Approachmentioning

confidence: 96%

Section: Theoretical Approachmentioning

confidence: 99%

Modeling of laser processing as a distortion compensation strategy for profile grinding

Schieber

Hettig

Muller

et al. 2022

Prod. Eng. Res. Devel.

View full text Add to dashboard Cite

show abstract

“…Both hot forming and W-Temper forming require subsequent artificial ageing by heat treatment to restore the high strength T6 condition. [4,8] Min et al significantly shorten the necessary artificial ageing cycles compared to conventional approaches while achieving similar high-strength properties. [9] Both processes require energyintensive SA of the entire blank prior to forming, regardless of the part geometry, which increases cycle times.…”

Section: Introductionmentioning

confidence: 99%

Extension of Process Limits in High‐Strength Aluminum Forming by Local Contact Heating

Sellner

Groche

2023

Adv Eng Mater

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The aluminum alloy EN AW‐7075 T6 is used in the automotive sector for its favorable strength‐to‐weight ratio. However, the limited cold formability is currently addressed by energy‐ and time‐consuming temperature‐assisted processes. In order to limit the effort to critical forming areas only, the state‐of‐the‐art shows promising results for increasing the blank temperature in the range of warm forming. The design of new processes in an industrial context requires appropriate numerical simulation with inherent complexity due to time‐ and temperature‐dependent effects. Herein, the potential of a newly developed tool setup and process chain with integrated local contact heating of the EN AW‐7075 T6 blank is investigated on the basis of a curved hat profile. A thermomechanically coupled FE model of the process is developed and validated. The influence of the local heating layout is analyzed in experimental forming tests and a corresponding process window is derived. The influence of local heating on the occurring failure mechanisms is discussed based on simulation results. The equivalent plastic strain evolution is successfully used to evaluate the local heating dependent failure behavior. A significant increase in the overall formability of the part is achieved by the proposed process chain.

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Investigation of Two Laser Heat Treatment Strategies for Local Softening of a Sheet in Age-Hardening Aluminum Alloy by Means of Physical Simulation

Palmieri,

Tricarico

2024

J. of Materi Eng and Perform

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Car manufacturers increasingly aid high-strength aluminum alloys for their advantageous weight-to-strength ratio, but their limited formability poses challenges in plastic deformation processes. Tailored heat-treated blanks (THTBs) are a propitious approach to improve formability. Surface laser treatment is the predominant technology for obtaining THTB. To design this process quickly and accurately, without material waste, the use of physical simulation is increasingly promising. It allows replicating the process on a lab-scale and studying posttreatment mechanical and metallurgical properties. By adopting Gleeble® physical simulator, this study investigates the softening effects of local surface laser heat treatment on a EN AW 6082 T6 aluminum alloy blank. Two laser movement strategies—single linear path and multiple rectangular paths—were investigated at two treatment speeds for each. A finite element (FE) model was developed for simulating the process under all explored conditions. FE-derived thermal cycles were reproduced by means of physical simulation. After physical tests, alloy mechanical properties were evaluated. Results show that these properties depend on both the peak temperature thermal cycle and the interaction time between the laser source and the material surface. The comparison between the two strategies revealed that the multiple rectangular paths strategy allows to achieve a wider softened area at comparable interaction times.

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Experimental investigation of distortion behavior of laser heat treated blanks

Cited by 4 publications

References 3 publications

Modeling of laser processing as a distortion compensation strategy for profile grinding

Modeling of laser processing as a distortion compensation strategy for profile grinding

Extension of Process Limits in High‐Strength Aluminum Forming by Local Contact Heating

Investigation of Two Laser Heat Treatment Strategies for Local Softening of a Sheet in Age-Hardening Aluminum Alloy by Means of Physical Simulation

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