Influence of decarburization on the local corrosion behavior of the SAE 9254 spring steel
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2019
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BRAZIL MRS MEETING, 18th
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Resumo
Decarburization is an unwanted metallurgical phenomenon comprising the loss of
carbon from the steel through outward diffusion and oxidation on the surface at
high temperatures. As this phenomenon leads to phase transformations in a small
region close to the surface, it is likely expecting some effects on the local
chemical reactivity of the steel. This, in turn, would account for the appearance of
preferential anodic sites that can act as localized corrosion spots. Macroscopic
corrosion symptoms, observed by conventional corrosion techniques, express only
the final step of a complex and dynamic sequence that begins at the microscopic
level. Several localized electrochemical techniques can be used to characterize
local corrosion processes. One of them is the scanning electrochemical
microscopy (SECM). The aim of the present work was to study the surface
chemistry, microstructure and local corrosion processes at the decarburized layer
of the SAE 9254 automotive spring steel. The samples were austenitized at 800,
850, 900 and 950 °C followed by oil quenching. The microstructure was
investigated using confocal laser scanning microscopy and scanning electron
microscopy. The surface chemistry was analyzed by X-ray photoelectron
spectroscopy. The local electrochemical activity was probed by SECM.
Microstructural characterization and XPS analysis indicate a dependence of the
local electrochemical processes with the steel microconstituents and also Si and
Cr oxides formed during heat treatments. The presence of the ferritic layer
enhanced the multiphase character of the steel microstructure in the region of
partial decarburization of sample A900, increasing iron oxidation and, therefore,
the local electrochemical activity for this condition.
Como referenciar
SANTANA, JESSICA C.C. de C.; SILVA, REJANE M.P. da; ANTUNES, R.A.; SANTOS, SYDNEY F. Influence of decarburization on the local corrosion behavior of the SAE 9254 spring steel. In: BRAZIL MRS MEETING, 18th, September 22-26, 2019, Balneário Camburiú, SC. Abstract... São Carlos, SP: Aptor Software, 2019. p. 2199-2199. Disponível em: http://repositorio.ipen.br/handle/123456789/31040. Acesso em: 18 Apr 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.