Advanced laser heat treatment with respect for the application for Tailored Heat Treated Blanks

Merklein, Marion; Nguyen, Hung

doi:10.1016/j.phpro.2010.08.049

Cited by 12 publications

(5 citation statements)

References 6 publications

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“…In fact, according to the well-known precipitation sequence of Al-Mg-Si alloys [14][15][16][17][18][19], the heat treatment can be designed to dissolve precipitates at the grain boundaries (from a T6/T4 state) to improve the material formability or, alternatively, start from a more formable condition and use the local treatment to promote the precipitation of hardening phases. In particular, due to the complexity of the process and the wide number of parameters involved in both steps, the process design is not trivial and a Finite Element (FE) based approach represents an efficient tool able to provide the optimal value of the process parameters to effectively treat selected areas while creating a very small transition region (due to the high material conductivity) [20].…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization of the Local Laser Treatment to Improve the Formability of Age Hardenable Aluminium Alloys

Piccininni

Palumbo

2020

Materials

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The research of innovative methodologies to improve the Aluminium alloys formability at room temperature still remains an open question: the local modification of the material properties via short-term heat treatments followed by the stamping at room temperature is reported to be an effective alternative to the forming in warm conditions. In the present work, such a methodology has been applied to the deep drawing of an age-hardenable Aluminium alloy (AA6082-T6) using an experimental/numerical approach. A preliminary extensive material characterization was aimed at investigating the material behaviour: (i) in the as-received condition (peak hardening), (ii) in the supersaturated condition (obtained by physical simulation) and (iii) after being locally solutioned via laser heating. A Finite Element based approach (Abaqus CAE, v. 6.17) was then used to design the laser treatment of the blanks to be subsequently deep drawn at room temperature: a 2D axisymmetric model of the deep drawing process was coupled with the optimization platform modeFRONTIER in order to define the radial extent of the laser heat treated area able to maximize the Limit Drawing Ratio. The experimental tests were finally conducted for validation purposes and revealed the effectiveness of the adopted approach which allowed to improve the drawability of more than 20% with respect to the as received condition (T6).

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Section: Introductionmentioning

confidence: 99%

Design and Optimization of the Local Laser Treatment to Improve the Formability of Age Hardenable Aluminium Alloys

Piccininni

Palumbo

2020

Materials

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“…The simulation was then developed by Geiger et al [7] with an inverse approach, allowing the calculation of appropriate laser heat treatment parameters. The consecutive cycle of heating and cooling introduced by a multi-path laser heat treatment strategy for a large-scale local laser heat treatment was investigated by Merklein et al [8]. Laser beam energy has proven to be effective in homogenizing the temperature of large-scale areas.…”

Section: Introductionmentioning

confidence: 99%

Development of Laser Heat Treatment Process for Assisted Forming of Aluminum Alloys

2023

IJEM

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This study presents information regarding the development of a localized laser-induced heat treatment for aluminum alloys. Such a process is intended to improve the forming behavior of aluminum parts in challenging metal-forming conditions. This study details information on material, heat treatment parameters as well as results for strength, hardness, and elongation properties. It was concluded that it is possible to locally modify yield strength and hardness using laser control parameters and process duration suitable for industrial applications.

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“…A mockup geometry made of martensitic steel revealed a significant decrease of 78% of the sliding force. 7 Merklein et al 22 have identified four parameters, regarding the temperature -time profile, as the most important for the manufacturing of THTB: (1) heating rate; (2) holding time; (3) cooling time and (4) maximum temperature. Meanwhile, the heating technology must comply with three key requirements as stated by Merklein et al 23 : high heating rate; temperature uniformity; and third, reproductivity of the heating parameters.…”

Section: Introductionmentioning

confidence: 99%

“…The natural cooling enhanced a sharp transition and thus, a separation between the heat-treated and non-heat-treated areas. 22 As for the maximum temperature, Geiger et al 13 specified that all relevant microstructural mechanisms in the context of THTB directly correlate with the maximum temperature; indeed, most of the authors correlate material softening as a function of the LHT maximum temperature. 24,25 Regarding HSS, there is still a lack of experimental data to determine maximum temperature influence.…”

Section: Introductionmentioning

confidence: 99%

Process and parameters for laser assisted localised heat treatment in manufacturing applications

Pereira

Peixinho

Carneiro

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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This paper presents information and results relevant for the development of a laser heat treatment process suitable to improve manufacturing in high strength steel and high strength aluminium alloys. The challenges with manufacturing of such materials include springback effect and localised fracture. The study details heat cycle and their effect in metallurgical state and mechanical properties. Such laser induced heat treatment process is intended to improve the forming behaviour of metal parts in challenging metal forming conditions, in particular for the delay or avoidance of localised fracture. Results for strength, hardness and elongation properties are presented. It was concluded that it is possible to locally modify yield strength and hardness using process duration suitable for industrial applications. Suitable process temperature ranges and target heat cycles were identified. A positive effect of material softening was observed in both hardness and strength properties. However, in some cases a reduction of ductility is apparent which must be considered for targeted industrial applications. The dimension of the heat-affected zone was also considered as design variable for the industrial process development. Preliminary results were obtained in a development forming tool.

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Advanced laser heat treatment with respect for the application for Tailored Heat Treated Blanks

Cited by 12 publications

References 6 publications

Design and Optimization of the Local Laser Treatment to Improve the Formability of Age Hardenable Aluminium Alloys

Design and Optimization of the Local Laser Treatment to Improve the Formability of Age Hardenable Aluminium Alloys

Development of Laser Heat Treatment Process for Assisted Forming of Aluminum Alloys

Process and parameters for laser assisted localised heat treatment in manufacturing applications

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