Hot Tube Forming

Billur, Eren; Schieck, Frank

doi:10.1007/978-3-319-98870-2_9

Cited by 2 publications

(3 citation statements)

References 13 publications

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“…High-strength steel sheets are commonly used in the manufacturing of car bodies to ensure safety and reduce weight. Hot-formed 22MnB5 steel has excellent mechanical properties and is widely used in the production of crucial parts such as A/B pillars and bumpers [5][6][7]. Initially, the material exhibits a ferritic-pearlitic microstructure with a tensile strength of about 600 MPa.…”

Section: Introductionmentioning

confidence: 99%

A Study of the Laser Removal Process of Al-Si Coating from 22MnB5 Steel

Zhang

Lin

et al. 2023

Materials

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22MnB5 hot forming steel is widely used in the automotive industry due to the increasing demand for lightweight vehicles. As surface oxidation and decarburization occur during hot stamping processes, an Al-Si coating is often precoated on surfaces. The coating tends to melt into the melt pool during the laser welding of the matrix and reduce the strength of the welded joint; therefore, it should be removed. The decoating process by sub-nanosecond and picosecond lasers and process parameter optimization were conducted in this paper. The corresponding analysis of the different decoating processes, the mechanical properties and the elemental distribution was carried out after laser welding and heat treatment. It was found that the Al element has an influence on the strength and elongation of the welded joint. The high-power picosecond laser has a better removal effect than the lower power sub-nanosecond laser. The best mechanical properties of the welded joint were obtained under the process conditions of 1064 nm center wavelength, 15 kW power, 100 kHz frequency, and 0.1 m/s speed. In addition, the content of the coating metal elements (mainly Al) melted into the welded joint is reduced with increasing coating removal width, which significantly improves the mechanical properties of the welded joints. Al in the coating rarely melts into the welding pool when the coating removal width is not less than 0.4 mm, and its mechanical properties can meet the automotive stamping requirements for the welded plate.

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Section: Introductionmentioning

confidence: 99%

A Study of the Laser Removal Process of Al-Si Coating from 22MnB5 Steel

Zhang

Lin

et al. 2023

Materials

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“…In order to design lightweight structures in automobiles, hot press formed (HPF) or hot formed steels are important because of their ultrahigh strength, high formability at elevated temperature and reduced springback [1]. Although the conventional B-added HPF steels ('boron steels'), e.g.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, conventional HPF steels require high blank reheating temperatures (>900 o C) leading to degradation of the coating of precoated sheets. In particular, Zn-coated steels suffer from liquid metal embrittlement (LME) induced microcracking during direct hot forming and also during resistance spot welding [1,11]. On the contrary, medium Mn steels require lower reheating temperatures due to their ideally required intercritical treatment and the effect of Mn on suppressing the austenite transformation temperature (Ae3) [12].…”

Section: Introductionmentioning

confidence: 99%

Low Temperature Hot Press Forming of a Zinc Coated Third Generation Advanced High Strength Steel

Rana,

Kop,

Beentjes

et al. 2023

MSF

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A 7 wt.% Mn steel was designed and was cast and processed to 1.5 mm sheets. The sheets were continuous annealed and coated with a Zn alloy by hot dip galvanizing before subjecting them to hot press forming cycles. The final microstructure was characterized by ultrafine ferrite grains and a high fraction of retained austenite. Excellent combinations of in-service strength-ductility-bendability were achieved for hot forming in the temperature range of 530-675 °C. The use of the low temperature hot forming minimized the liquid metal embrittlement induced cracking with Zn coating during hot forming and spot welding. Various application properties such as oxidation resistance, corrosion resistance, and springback were found at optimum levels for hot forming at 675 °C.

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Hot Tube Forming

Cited by 2 publications

References 13 publications

A Study of the Laser Removal Process of Al-Si Coating from 22MnB5 Steel

A Study of the Laser Removal Process of Al-Si Coating from 22MnB5 Steel

Low Temperature Hot Press Forming of a Zinc Coated Third Generation Advanced High Strength Steel

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