Formation of an Aluminide Coating on Hot Stamped Steel

Fan, Dong; Cooman, Bruno C. De

doi:10.2355/isijinternational.50.1713

Cited by 38 publications

(16 citation statements)

References 8 publications

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“…The coating has excellent high temperature ductility and thermal oxidation resistance. Although FeAl is ductile at high temperature, it becomes brittle below 800°C 36. Kuc et al37 also reported that FeAl cracks when it is deformed at temperatures below 800°C at a strain rate of 0.5 s −1 .…”

Section: Aluminized Coatingmentioning

confidence: 99%

“…A similar aluminide coating suitable for hot stamping was proposed by Fan and De Cooman 36. The coating has excellent high temperature ductility and thermal oxidation resistance.…”

Section: Aluminized Coatingmentioning

confidence: 99%

“…Kuc et al37 also reported that FeAl cracks when it is deformed at temperatures below 800°C at a strain rate of 0.5 s −1 . In contrast, the Fe 3 Al phase is ductile in a wide temperature range 36. The criterion for ductile coating formation is that the coating should be the α‐Fe phase with Al in solid solution at high temperature.…”

Section: Aluminized Coatingmentioning

confidence: 99%

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State‐of‐the‐Knowledge on Coating Systems for Hot Stamped Parts

Fan

Cooman

2012

steel research int.

Self Cite

175

140

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In the present contribution, recent developments of coatings for hot stamped steels are reviewed. The use of bare steel in the initial hot stamping technology is discussed, including the application of lubricant oils which are used as oxidation inhibitors on bare steel surfaces. The aluminized coatings are introduced, focusing on the microstructure evolution of aluminized coatings during the hot stamping process. An analysis of the cracking of the coating, caused by the formation of brittle Fe-Al intermetallic phases and their high temperature deformation, is presented. The development of a ductile aluminide coating formed during the diffusion treatment of an aluminized coating is discussed. This aluminide coating can endure both high temperature oxidation and severe plastic deformation. The recently developed galvanized and galvannealed coatings are also reviewed and the influence of the gas atmosphere during the heating cycle on the coating stability is emphasized. The solutions which have been proposed to avoid liquid Zninduced embrittlement are analyzed. The use of Zn-Ni alloy coating, which is characterized by a higher melting temperature, is reviewed. The behavior of sol-gel hybrid coatings on hot stamped steels is discussed. The possible use of the recently developed Al-Zn alloy coatings, dual layer Zn-Al and Zn-Al-Mg coatings is also introduced. The application of Zn-Al-Mg post-process galvanizing is also discussed. In each case, all available information related to the weldability, paintability, and corrosion resistance of the coating systems is also reported. Finally, the advantages and technical challenges associated with each type of coating are reviewed.[ Ã ] Dr.

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Section: Aluminized Coatingmentioning

confidence: 99%

“…A similar aluminide coating suitable for hot stamping was proposed by Fan and De Cooman 36. The coating has excellent high temperature ductility and thermal oxidation resistance.…”

Section: Aluminized Coatingmentioning

confidence: 99%

Section: Aluminized Coatingmentioning

confidence: 99%

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State‐of‐the‐Knowledge on Coating Systems for Hot Stamped Parts

Fan

Cooman

2012

steel research int.

Self Cite

175

140

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“…This steel owns an ultrahigh strength far beyond the cold stamping steels, which makes it be the focus in the field of automobile manufacture and research. [3][4][5] Welding is a primary manufacturing process used in automobile industry, it is thus important to understand the mechanical and metallurgical phenomena concerned to the welding of AHSS. Furthermore, laser beam welding (LBW) has been very popular in auto manufacture, amounts of studies [6][7][8][9][10] have been carried out to investigate the laser welding of AHSS used in light weight vehicles.…”

Section: Introductionmentioning

confidence: 99%

Retraction: Microstructure and Properties of Fiber Laser Welded Joints of Ultrahigh-strength Steel 22MnB5 and its Dissimilar Combination with Q235 Steel

Jia

Yang

et al. 2014

ISIJ Int.

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This paper is to analyze the microstructure, microhardness, tensile and fatigue properties of the welded joints performed by a fiber laser on the 22MnB5 and Q235 steels in similar and dissimilar combinations. The result shows that the weld zone (WZ) consisted of lathy martensite, and the heat affected zone (HAZ) of 22MnB5 could be divided into 3 parts: quenched zone, incomplete quenched zone and the tempered zone which didn't appear in the Q235 HAZ. The WZ had the highest hardness, while the HAZ was very narrow with a very fast drop in hardness. A soft zone existed in the HAZ of 22MnB5, and it was absent on the Q235 side. With the welding speed increasing, the martensite in the WZ became thinner and shorter, and the width of HAZ decreased. All the tensile and fatigue specimens of the similar 22MnB5 welded joints were broken in the HAZ. The base metal (BM) had a higher fatigue life than the similar 22MnB5 welded joints. The fatigue fracture contained 3 parts: crack initiation region which occurred from the specimen surface, crack propagation region and the final fast fracture region.

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“…To prevent scaling during this procedure, an aluminium-silicon (aluminiumsilicon 10 iron 3 or similar) coating is usually applied by hot dip aluminizing. Thus, it results in a coating thickness between 25-35 mm [4,5]. After the aluminizing process, a distinctive line with a thickness of 3 mm-6 mm can be seen between the substrate and the coating, which can be identified as an intermetallic phase layer [5].…”

Section: Introductionmentioning

confidence: 99%

Modified laser beam welding of aluminum‐silicon coated 22MnB5

Gerhards

Engels

Olschok

et al. 2019

Materialwissenschaft Werkst

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Press hardened 22MnB5 is an excellent structural material, but there are several issues when it comes to welding. Especially in the case of overlap joint laser welding, the most severe issue is precipitation of the aluminium silicon (AlSi) coating at the fusion line. If the coating remains on the sheets, an ultimate strength of 20 kN with a crack initiation at the fusion line is reached in tensile tests instead of 30 kN with a crack initiation in the heat affected zone (HAZ) when the coating is removed prior to welding. In the presented work, the influence of coating on the material properties as well as the structure of the precipitation at the fusion line are examined and discussed. It is stated that the precipitation does not consist of AlxFey intermetallic phases, but of an iron, aluminium and silicon solid solution. The fractured surfaces of tensile tests show brittle behavior for the precipitation and ductile behavior for areas where the crack propagated through the steel. A modified beam oscillation in the shape of a recumbent “8” in welding direction is introduced. It was possible to increase the ultimate strength by 10 kN and nearly double the possible elongation.

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Formation of an Aluminide Coating on Hot Stamped Steel

Cited by 38 publications

References 8 publications

State‐of‐the‐Knowledge on Coating Systems for Hot Stamped Parts

State‐of‐the‐Knowledge on Coating Systems for Hot Stamped Parts

Retraction: Microstructure and Properties of Fiber Laser Welded Joints of Ultrahigh-strength Steel 22MnB5 and its Dissimilar Combination with Q235 Steel

Modified laser beam welding of aluminum‐silicon coated 22MnB5

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