Performance improvement of tailored die quenching using material combinations with phase change material in hot stamping

Yun, Sungho; Song, Kang Sub; Cho, Wonhee; Kim, Yongchan

doi:10.1016/j.ijheatmasstransfer.2020.120286

Cited by 8 publications

(4 citation statements)

References 51 publications

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“…Several methods are available to obtain tailored microstructures, such as partial heating, differential cooling, tailor-welded and rolled blanks and partial annealing after hot stamping. [45][46][47][48][49][50][51][52]. For example, Oldenburg [45] used a material combination approach to develop dies comprising materials of different thermal conductivities to achieve different cooling rates as a function of location during the forming stage.…”

Section: Tailored Microstructures and The Quenching And Partitioning Processmentioning

confidence: 99%

“…This enabled the boron steel microstructure after hot stamping to be tailored. Yun et al [50] further developed the material combination approach, using lithium nitrate undergoing a phase transformation as the part with low thermal conductivity. This effectively avoided the problem of heat conduction between different materials, and high-quality tailored blanks could be obtained.…”

Section: Tailored Microstructures and The Quenching And Partitioning Processmentioning

confidence: 99%

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New Developments and Future Trends in Low-Temperature Hot Stamping Technologies: A Review

Tong

Rong

Yardley

et al. 2020

Metals

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Improvement of the hot stamping process is important for reducing processing costs and improving the productivity and tensile properties of final components. One major approach to this has been to conduct all or part of the process at lower temperatures. The present paper reviews the state of the art of hot stamping techniques and their applications, considering the following aspects: (1) conventional hot stamping and its advanced developments; (2) warm stamping approaches in which complete austenitisation is not attained during heating; (3) hot stamping with a lower forming temperature, i.e., low-temperature hot stamping (LTHS); (4) advanced medium-Mn steels with lower austenitisation temperatures and their applicability in LTHS. Prospects for the further development of LTHS technology and the work required to achieve this are discussed.

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Section: Tailored Microstructures and The Quenching And Partitioning Processmentioning

confidence: 99%

Section: Tailored Microstructures and The Quenching And Partitioning Processmentioning

confidence: 99%

New Developments and Future Trends in Low-Temperature Hot Stamping Technologies: A Review

Tong

Rong

Yardley

et al. 2020

Metals

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“…Notably, they reported that the performance gain offered by MWCNT over PCM/CFM was only marginal. A subsequent experimental study [22] explored the use of PCM in solar water systems, aiming to enhance heat transfer and decrease the friction factor. The inclusion of 6kg PCM resulted in an overall performance increase of more than 30%.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Convective Heat Transfer in a Nanofluid-Filled Enclosure: An Optimization of Fin Placement and Material

Rudrabhiramu,

Kumar,

Rao

2023

IJHT

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The strategic utilization of nanofluids within square enclosures comprising horizontal fins presents promising applications ranging from electronic cooling systems, nuclear reactor heat management, to solar energy collection. This study employs numerical simulations to delineate the intricacies of heat transfer phenomena under the influence of natural convection in a laminar flow regime within a square enclosure of varied cavity dimensions. The enclosure is filled with a nanofluid composed of Al2O3 at a concentration of 3%, suspended in H2O, Ethylene Glycol (EG), and H2O/EG mixtures. The position and length of a specific fin are scrutinized, along with an array of Rayleigh numbers. Numerical analyses are executed using the homogeneous heat transfer model in Ansys Fluent. Observations reveal a direct correlation between the increase in Rayleigh number (ranging from 10 3 to 106), the conductivity ratio and an elevation in the surface temperature, consequently contributing to an enhanced efficiency of heat transmission. Optimal fin placement for maximum heat transfer improvement is detected at a height of 0.5 m and a length of 0.75 m within the enclosure. The study further investigates the Nusselt number variations of Al2O3 nanoparticles at a 3% volume concentration when suspended in water, a combination of water and Ethylene Glycol, and Ethylene Glycol alone. Upon a rise in wall temperature, an increase in the Rayleigh number is noted, inducing heightened convective activity and hence, improved heat transmission. Additionally, it is established that an increase in the conductivity ratio of the fin significantly augments heat transfer enhancement.

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“…Tang et al [19] investigated the influence of temperature and deformation on phase transformation and hardening of hot-stamped components produced by tailored processes. Yun et al [20] improved the tailored die quenching using material combination by adding lithium nitrate to transfer the phase of the material. Kong et al [21] investigated the re-deformation characteristics of hot-stamped boron steel parts with tailored properties obtained by local induction heating and press hardening.…”

Section: Introductionmentioning

confidence: 99%

Corner Strengthening by Local Thickening and Ausforming Using Planar Compression in Hot Stamping of Ultra-High Strength Steel Parts

Maeno

Mori

Homma

et al. 2021

Metals

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Hot-stamped products are widely used for the body-in-white of an automobile as they are lightweight and improve crashworthiness. A hot-stamping process using planar compression was developed to strengthen corners of ultra-high strength parts by local thickening and hardening. In this process, the corners are thickened by compressing the blank in the planar direction with the upper and lower dies while blocking the movement of both edges with stoppers in the latter stage of forming. Thickening of the corners largely heightens the strength of the formed parts. Not only the thickness but also the hardness of the corner was increased by large plastic deformation and die quenching. For a hot hat-shaped part, a 30% increase in thickness and a 530 HV20 hardness around the corners were attained. The bending rigidity and strength of the formed parts thickened by 30% in the corners increased by 25% and 20%, respectively. In addition, the improvements of the part shape accuracy and the sidewall quenchability were obtained.

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Performance improvement of tailored die quenching using material combinations with phase change material in hot stamping

Cited by 8 publications

References 51 publications

New Developments and Future Trends in Low-Temperature Hot Stamping Technologies: A Review

New Developments and Future Trends in Low-Temperature Hot Stamping Technologies: A Review

Enhanced Convective Heat Transfer in a Nanofluid-Filled Enclosure: An Optimization of Fin Placement and Material

Corner Strengthening by Local Thickening and Ausforming Using Planar Compression in Hot Stamping of Ultra-High Strength Steel Parts

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