Journal ArticleDOI
State‐of‐the‐Knowledge on Coating Systems for Hot Stamped Parts
Dong Wei Fan,Bruno C. De Cooman +1 more
TLDR
In this article, the microstructure evolution of aluminized coatings during the hot stamping process is discussed, and 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.Abstract:
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 Zn-induced 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.read more
Citations
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Journal ArticleDOI
Phase formation at the interface between a boron alloyed steel substrate and an Al-rich coating
TL;DR: In this paper, Al-base coating (AlSi10Fe3) was applied to a steel substrate (22MnB5) by hot dipping, and phase formation at the steel/coating interface was investigated by means of ex-situ phase analysis with synchrotron radiation and EBSD.
Journal ArticleDOI
Critical review of automotive hot-stamped sheet steel from an industrial perspective
T. Taylor,A. R. Clough +1 more
TL;DR: The hot-stamped sheet steel has developed to become the leading material in a modern state-of-the-art steel industry as discussed by the authors, and is the most widely used steel material in the world.
Journal ArticleDOI
Formation of intermetallic phases in Al-coated hot-stamped 22MnB5 sheets in terms of coating thickness and Si content
TL;DR: In this article, the formation of AlFe-rich intermetallics at the steel/coating interface was investigated by ex-situ phase analysis with synchrotron radiation and by electron backscatter diffraction.
Journal ArticleDOI
Refill friction stir spot welding of dissimilar aluminum alloy and AlSi coated steel
TL;DR: In this paper, AA5754 Al alloy and coated steel were successfully joined by refill friction stir spot welding through the eutectic Al-Si coating, the overlap shear strength increased with plunge depth and reached a high strength plateau which was attributed to maximum bonding size and strong Al/AlSi joint interface.
Journal ArticleDOI
Fusion zone microstructure evolution of fiber laser welded press-hardened steels
TL;DR: Fusion zone microstructures of fiber laser welded Al-Si coated press-hardened steels at pre-and post-press-hardening conditions were analyzed using transmission electron microscopy (TEM) and nanoindentation studies as mentioned in this paper.
References
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Journal ArticleDOI
A review on hot stamping
H. Karbasian,A.E. Tekkaya +1 more
TL;DR: In this article, the state of the art in the thermal, mechanical, microstructural, and technological fields of hot stamping is reviewed, and the investigations of all process sequences, from heating of the blank to hot stamps and subsequent further further processes are described.
Journal ArticleDOI
The metallurgy of zinc-coated steel
TL;DR: In this article, a review of the metallurgy of zinc-coated steel from a scientific standpoint to develop relationships to practical applications is presented. And the effect of the microstructures of these coatings on the important properties of corrosion, formability, weldability and paintability is discussed.
Journal ArticleDOI
Control of intermetallic compound layers at interface between steel and aluminum by diffusion-treatment
Shigeaki Kobayashi,Takao Yakou +1 more
TL;DR: In this article, the growth mechanism, morphology and mechanical properties of Fe-Al intermetallic compound layers on the surface of carbon steel were systematically evaluated for specimens diffused at temperatures ranging from 873 to 1323 K after hot dip aluminizing.
Journal ArticleDOI
An environmental effect as the major cause for room-temperature embrittlement in FeAl☆
C.T. Liu,Eal H. Lee,C.G. McKamey +2 more
TL;DR: Analyse de la ductilite et de la rupture a la temperature ambiante de l'aluminure FeAl contenant 36,5 at% Al dans differents environnements (air, vide, Ar+4% H 2, vapeur d'eau, oxygene pur)
Journal ArticleDOI
Metallurgy of continuous hot dip aluminizing
TL;DR: In spite of a strong commercial interest in hot dipped aluminised steel strip, research over the past 60 years has been somewhat piecemeal as mentioned in this paper, and a relatively small body of work exists on this material compared with the equivalent galvanised product but the lack of systematic study and development means that it is difficult to rationalise and appraise the existing literature.