Interlaboratory Comparison of Forming Limit Curves for Hot Stamping of High Strength Steels

Pellegrini, Daniele; Lechler, J.; Ghiotti, Andrea; Bruschi, Stefania; Merklein, Marion

doi:10.4028/www.scientific.net/kem.410-411.297

Cited by 29 publications

(10 citation statements)

References 5 publications

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“…Therefore, special heating cartridges have to be introduced in the punch, the die, and the blank holder to control the temperature of the setup. Pellegrini et al (2009) have shown that the thermally induced improvement of the material and higher values of the slip systems of austenite in comparison to the initial ferrite-pearlite microstructure are the cause of the evolution of the mechanical properties during hot stamping (Fig. 13).…”

Section: Tablementioning

confidence: 95%

“…The heating method by Lechler (2009) ensures a uniform distribution of the blank temperature during the heating phase in the furnace, but implies a more difficult control of the temperature during cooling due to the manual transfer to the press. The induction heating of Pellegrini et al (2009) leads to a less uniform distribution of the temperature but also to a good cooling control. Similar to cited works of Pellegrini et al (2009), Chastel et al (2008 have shown that the higher the initial blank temperature or the sheet thickness, the higher the critical strain in plane strain.…”

Section: Tablementioning

confidence: 98%

“…The induction heating of Pellegrini et al (2009) leads to a less uniform distribution of the temperature but also to a good cooling control. Similar to cited works of Pellegrini et al (2009), Chastel et al (2008 have shown that the higher the initial blank temperature or the sheet thickness, the higher the critical strain in plane strain.…”

Section: Tablementioning

confidence: 98%

See 2 more Smart Citations

A review on hot stamping

Karbasian

Tekkaya

2010

Journal of Materials Processing Technology

1,378

521

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Section: Tablementioning

confidence: 95%

Section: Tablementioning

confidence: 98%

See 1 more Smart Citation

A review on hot stamping

Karbasian

Tekkaya

2010

Journal of Materials Processing Technology

1,378

521

View full text Add to dashboard Cite

“…Coraz częściej stosuje się stale o podwyższonej wytrzymałości (advanced high strength steels -AHSS), dzięki czemu moż-na zmniejszać grubość poszczególnych elementów, redukując masę wyrobu [2,3]. W przypadku elementów stalowych proces tłoczenia realizowany jest w głównej mierze na zimno; nie dotyczy to jednak stali martenzytycznych o bardzo wysokiej wytrzymałości, które są formowane w podwyższonych temperaturach [4,5].…”

Section: Proces Tłoczenia Elementu Ze Stopu Az31unclassified

Computer-aided design work for hot stamping process by the example of a magnesium alloy product

et al. 2016

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Komputerowe wspomaganie projektowania procesu tłoczenia w podwyższonej temperaturze na przykładzie wytwarzania elementu ze stopu magnezu Computer-aided This work represents a segment of the investigation project work intended to review the prospects of application magnesium alloy materials for production of the car chassis parts. The need for the research has aroused from the concept of replacing the conventional heavy steel parts with the lightweight magnesium alloy substitutes revealing however equivalent strength and functional properties. The study focused on numerical simulation of the manufacturing process specified for the bracket supporting the steering system reinforcing beam. Laboratory tests of the magnesium alloy grade AZ31 material were performed and numerical simulations were conducted with due consideration given to material behavior when formed at elevated temperatures. Finally presented are the results of the tests and prospects of application of the magnesium alloys for selected purposes.

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“…The material formability during hot forming process depends on process parameters (temperature, velocity, blank holder force, friction and heat exchange), strain states and microstructural evolution during deformation [6]. Some scholars has investigated the FLC of high strength steel at elevated temperature with the Marciniak and the Nakajima tests being the most commonly applied ones [7,8,9]. And a few investigations introduced FLC to numerical simulation to evaluate hot forming formability of high strength steel [10].…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical determination of thermal forming limit diagrams (TFLD) of high strength steel 22MnB5

Shi

et al. 2013

AIP Conference Proceedings

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Hardness-based plasticity and fracture model for quench-hardenable boron steel (22MnB5) AIP Conf. Proc. 1567, 571 (2013); 10.1063/1.4850038The coupled thermo-mechanical-microstructural finite element modeling of hot stamping process in 22MnB5 steel AIP Conf. Proc. 1567, 552 (2013); 10.1063/1.4850034Modeling of tensional behavior of 22MnB5 boron steel at isothermal conditions by extended crystal plasticity AIP Conf.Abstract. High strength steel components are increasingly being considered for use in vehicle structures due to the potential for higher strength to weight ratio, fuel economy improvement and emission reduction. However, high strength steel's poor ductility at room temperature requires sheet forming to be carried out in hot forming method. The Thermal Forming Limit Diagram (TFLD) is an important primary criterion to determine how close the sheet metal is to tearing when it is formed into a product shape in hot forming process. In this work, an efficient experimental set-up named TFLD 300 which is based on Nakajima test has been developed. Several experiments for hot forming limits of high strength steel 22MnB5 were performed and the forming limit curves at different temperatures are obtained. Then the three-dimensional TFLD which considers temperature history and strain path is constructed. As an evaluation criterion for formability, the three-dimensional TFLD is introduced into KMAS (King Mesh Analysis System), which is independently developed commercial CAE software and can be used for hot forming simulation. Subsequently, a typical B-pillar's hot forming process with varying process conditions have been simulated by using the KMAS software. And the corresponding experiment results confirm that the KMAS software and three-dimensional TFLD can accurately predict the fracture of sheet metal in hot forming.

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Interlaboratory Comparison of Forming Limit Curves for Hot Stamping of High Strength Steels

Cited by 29 publications

References 5 publications

A review on hot stamping

A review on hot stamping

Computer-aided design work for hot stamping process by the example of a magnesium alloy product

Experimental and numerical determination of thermal forming limit diagrams (TFLD) of high strength steel 22MnB5

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