The use of scanning vibrating electrode technique to evaluate the effect of hot stamping on corrosion resistance of press hardened steel 22MnB5 metallic coated with electroplated ZnNi
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2018
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CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23.
Resumo
The carmakers and all their production chain must achieve worldwide targets of
lightweight, safety and reduced fuel consumption. The use of ultra high strength steel,
such as press-hardened steels (PHS), in vehicle structures has been contributing with
this. This type of steel is widely used in hot stamping process, which consists in heating
the steel blank to the total austenitization temperature, and then transferring it from the
furnace into the die where the steel is deformed and quenched at the same time, with
a minimum cooling rate of 27 K/s. The boron-manganese PHS steel comprises perlite
and ferrite microstructure, and its tensile strength is around 600 MPa in the annealed
condition. Thus, after the hot stamping process the PHS microstructure completely
changes to martensite and the tensile strength increases to 1500 MPa or more. The
transferring step is a critical one, due to the contact of the hot steel blank with the
atmospheric air; as consequence, it causes the steel oxidation. To avoid that, the steel
is protected with metallic coatings. The hot-dip AlSi is the most currently used coating
for this application, however, in order to keep up with the high PHS demand, alternative
coatings, like zinc-base is under investigation. This work had the objective of evaluating
the corrosion resistance of PHS, 22MnB5 grade, coated with electroplated ZnNi before
and after hot stamping, using scanning vibrating electrode technique (SVET). The
corrosion-localized techniques are more suitable, once the results showed that after
hot stamping the coating layer changes completely, as a result of chemical elements
diffusion. Thus, different phases of Zn-Fe-Ni are formed and random distributed which
impacts the corrosion resistance of the steel.
Como referenciar
COUTO, C.P.; COSTA, I.; VIVEIROS, B.G. de; ALENCAR, M.C.; PANOSSIAN, Z.; ROSSI, J.L.; COLOSIO, M.A. The use of scanning vibrating electrode technique to evaluate the effect of hot stamping on corrosion resistance of press hardened steel 22MnB5 metallic coated with electroplated ZnNi. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23., 04-08 de novembro, 2018, Foz do Iguaçu, PR. Resumo... p. 5149-5149. Disponível em: http://repositorio.ipen.br/handle/123456789/29567. Acesso em: 28 Mar 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.