Geometrical Variation from Selective Laser Heat Treatment of Boron Steels

Sagar, Vaishak Ramesh; Wärmefjord, Kristina; Söderberg, Rikard

doi:10.1016/j.procir.2018.04.062

Cited by 4 publications

(2 citation statements)

References 20 publications

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“…• C. The partition heating can be realized by means of specially designed heating equipment, such as furnaces with separated chambers [26], furnaces with special plate clamping devices [10], bypass resistance heating systems [7], and selective heating laser-based systems [27]. After heating, the blank is automatically transferred as quickly as possible to the forming press, with a transfer time usually controlled between 5 and 10 s. Then, the cooled dies are closed and kept clamped at a dwell pressure between 5 and 15 MPa to quench the component with a cooling rate above 27 • C/s suitable to obtain a fully martensitic structure where needed.…”

Section: Reference Processmentioning

confidence: 99%

Wear in Hot Stamping by Partition Heating

Simonetto

Scagnolari

et al. 2020

JMMP

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Hot stamping by partition heating of Al–Si coated boron steel sheets is currently utilized to produce parts of the car body-in-white with tailored microstructural and mechanical characteristics. This paper investigates the evolution of the Al–Si coating and its tribological and wear performances in the case of direct heating at the process temperatures of 700 °C, 800 °C, and 900 °C, skipping the preliminary austenitization as it may happen in the case of tailored tempered parts production. A specifically designed pin-on-disk configuration was used to reproduce at a laboratory scale the process thermo-mechanical cycle. The results show the morphological and chemical variation of the Al–Si coating with heating temperature, as well as that the friction coefficient, decreases with increased temperature. Furthermore, the results proved that the adhesive wear is the main mechanism at the lower temperature, while abrasive wear plays the major role at the higher temperature.

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Section: Reference Processmentioning

confidence: 99%

Wear in Hot Stamping by Partition Heating

Simonetto

Scagnolari

et al. 2020

JMMP

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“…Impulse laser treatment of steels and alloys which makes it possible to create a certain structural state and to specify the properties of surface layers of products according to the requirements of the operating conditions, is prominent enough among the wide variety of surface hardening techniques [1][2][3][4][5][6]. Pulsed laser radiation has unique characteristics that allow heating the surface of materials at hyper-high speeds (10 6 deg/s) and with almost complete absence of exposure at temperatures above critical points.…”

Section: Introductionmentioning

confidence: 99%

Physical Aspects of Laser Steel Processing in the Magnetic Field

Brover

Topolskaya

2022

MSF

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The article contains the results of experiments carried out on laser irradiation of steels in a constant magnetic field. The experiment shows it possible to increase the cooling speed while heat transfer decreases from the surface into lower metal layers, which slightly reduces laser-hardened layer depth, increases convective mixing of the fusion area, which have a positive impact on the surface layers quality of steel and alloys. This has a positive effect on strength product properties. Magnetic field processing of metal reduces the degree of local plastic deformation of irradiated layer due to magnetostriction phenomenon. Magnetic field superimposition contributes to two-phase decay of the martensite, and reduces residual stresses and crack risk.

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Influence of Selective Laser Heat Treatment Pattern Position on Geometrical Variation

Sagar

Wärmefjord

Söderberg

2019

Journal of Manufacturing Science and Engineering

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Selective laser heat treatment allows local modification of material properties and can have a wide range of applications within the automotive industry. Enhanced formability and strength are possible to achieve. As the process involves selective heating, positioning of the heat treatment pattern in local areas is vital. Pattern positioning is often suggested based on the part design and forming aspects of the material to avoid failures during manufacturing. Along with improving material properties in desired local areas, the process also produces unwanted distortion in the material. Such effects on variation should be considered and minimized. In this paper, the heat treatment pattern is offset from its original position and its effect on geometrical variation is investigated. Boron steel blanks are selectively laser heat treated with a specific heat treatment pattern and then cold formed to the desired shape. Two heat treatment pattern dimensions are examined. Geometrical variation at the blank level and after cold forming, and springback after cold forming are observed. Results show that pattern offsetting increases the effect on geometrical variation. Therefore, correct positioning of the heat treatment pattern is important to minimize its effect on geometrical variation along with enhancement in the material properties. Knowledge from this study will contribute to various stages of the geometry assurance process.

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Geometrical Variation from Selective Laser Heat Treatment of Boron Steels

Cited by 4 publications

References 20 publications

Wear in Hot Stamping by Partition Heating

Wear in Hot Stamping by Partition Heating

Physical Aspects of Laser Steel Processing in the Magnetic Field

Influence of Selective Laser Heat Treatment Pattern Position on Geometrical Variation

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