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Characterization of 22MnB5 steel metallic coated with either hot-dip AlSi or electroplated ZnNi before and after hot stamping
Technical Paper
2018-36-0074
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The number of hot stamped components has been steadily increasing in the automotive industry. Press hardened steels (PHS) are generally used in hot stamping because, at the end of the process, the steel may achieve a tensile strength about 1,500 MPa. The hot stamping process consists of heating the steel blank at total austenitization temperatures and transferring it into the press tooling for forming and quenching simultaneously, and then to obtain a fully martensitic transformation. This transference step, from the furnace to the press, is a critical stage since it might promote steel oxidation. The application of metallic coatings avoids this event. The AlSi coating has been the most applied system on steel. However, alternative coatings, as ZnNi, are under development to keep up with the high demand. This study had the objective of characterizing and comparing the surface and transverse section morphologies in AlSi and ZnNi coatings, with scanning electron microscopy - SEM and energy dispersive spectroscopy - EDS techniques, before and after the hot stamping, and then, evaluating the effect of this process on coating morphologies. After the hot stamping, the coating layers change completely, due to the formation of different phases as a result of chemical element diffusion from the coating into the steel substrate and vice-versa. Cracks were seen in both AlSi and ZnNi coatings, but the cracks in the AlSi coating can be more critical due to the lack of cathodic protection.
Authors
- Camila Pucci Couto - Nuclear Energy Institute General Motors Mercosul Institute f
- Marco Antonio Colosio - Nuclear Energy Institute General Motors Mercosul Institute f
- Isolda Costa - Nuclear Energy Institute General Motors Mercosul Institute f
- Luzinete Pereira Barbosa - Nuclear Energy Institute General Motors Mercosul Institute f
- Zehbour Panossian - Nuclear Energy Institute General Motors Mercosul Institute f
- Jesualdo Luiz Rossi - Nuclear Energy Institute General Motors Mercosul Institute f
Topic
Citation
Couto, C., Colosio, M., Costa, I., Barbosa, L. et al., "Characterization of 22MnB5 steel metallic coated with either hot-dip AlSi or electroplated ZnNi before and after hot stamping," SAE Technical Paper 2018-36-0074, 2018, https://doi.org/10.4271/2018-36-0074.Also In
References
- Merklein , M. and Lechler , J. Investigation of the thermo-mechanical properties of hot stamping steels Journal of Materials Processing Technology 177 452 455 2006
- Allély , C. , Dosdat , L. , Clauzeau , O. , Ogle , K. et. al. Anticorrosion mechanisms of aluminized steel for hot stamping Surface & Coatings Technology 238 188 196 2014 10.1016/j.surfcoat.2013.10.072
- Tekkaya , A. E. , Khalifa , N. B. , Grzancic , G. , Hölker , R. Forming of lightweight metal components: Need for new technologies 11th International Conference on Technology of Plasticity, ICTP 2014 19-24 October 2014 Nagoya Congress Center, Nagoya, Japan 81 28 37 2014 10.1016/j.proeng.2014.09.125
- Ying , C. , Zhao-huan , M. , Liang , Y. , Xiao-dong , L. et al. Influence of Hot Press Forming Techniques on Properties of Vehicle High Strength Steels Journal of Iron and Steel Research, International 18 5 59 63 2011
- Karbasian , H. , Tekkaya , A. E. A review on hot stamping Journal of Materials Processing Technology 210 2103 2118 2010
- FAN , D. W. , KIM , H. S. ; OH , J. , CHIN , K. et al. Coating Degradation in Hot Press Forming ISIJ International 50 4 561 568 2010
- Kondratiuk , J. , Kuhn , P. , Labrenz , E. and Bischoff , C. Zinc coatings for hot sheet metal forming: Comparison of phase evolution and microstructure during heat treatment Surface & Coatings Technology 205 4141 4153 2011 10.1016/j.surfcoat.2011.03.002
- Mori , K. , Bariani , P.F. ; Behrens , B.-A. Brosius , A. et. al. Hot stamping of ultra-high strength steel parts CIRP Annals - Manufacturing Technology 66 755 777 2017 10.1016/j.cirp.2017.05.007
- Neugebauera , R. , Schieck , F. , Polster , S. , Mosel , A. et al. Press hardening -An innovative and challenging technology Archives of civil and mechanical engineering 12 113 118 2012 10.1016/j.acme.2012.04.013
- Windmann , M. , Röttger , A. , Theisen , W. Formation of intermetallic phases in Al-coated hot-stamped 22MnB5 sheets in terms of coating thickness and Si content Surface & Coatings Technology 246 17 25 2014 10.1016/j.surfcoat.2014.02.056
- Couto , C. P. ; Costa , P. D. O. L. ; Martinez , L. G. ; Turrillas , X. ; Rossi , J. L. The use of X-ray diffraction for phase identification of press hardened steels VII Scientific Meeting of Applied Physics 19-20 May Vitória, Espirito Santo, Brazil 159 161 Blucher Physics Proceedings 3 1 159 161 2016 2358-2359 10.5151/phypro-vii-efa-038
- Panossian , Z. Zinc/nickel bath: a guide to Brasmetal Waelzholz S.A.