Investigation on the effect of plastic deformation on the fatigue-corrosion resistance of the austenitic stainless steel NBR ISO 5832 for biomedical use

• Grant number: 12/50187-7
• Support Opportunities: Regular Research Grants
• Start date: October 01, 2012
• End date: September 30, 2015
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Transformation Metallurgy
• Principal Investigator: Isolda Costa
• Grantee: Isolda Costa
• Host Institution: Instituto de Pesquisas Energéticas e Nucleares (IPEN). Secretaria de Desenvolvimento Econômico (São Paulo - Estado). São Paulo , SP, Brazil

Abstract

Localized corrosion in stainless steels can be manifested in different ways, such as: pitting corrosion, crevice corrosion, stress corrosion cracking and fatigue-corrosion, among others, when material is exposed to aggressive environments. The fatigue-corrosion process is one of the main causes of prosthesis failure. The literature reports on the effect of plastic deformation on the corrosion process. Despite of this, the influence of deformation on the fatigue corrosion mechanism was not found in the literature. The aim of this work is to evaluate the effect of plastic deformation by cold rolling, crystallographic orientation (texture) are metallurgic aspects resulting from deformation on the fatigue-corrosion resistance of NBR ISO 5832 austenitic stainless steel (with and without nitrogen). Stainless steel samples, with and without cold deformation, will be initially characterized (both non-metallic inclusions and microstructural characterization), using the scanning electron microscopy (SEM) and transmission electron microscopy (TEM). After microstructural characterization, texture studies for determination of the crystallographic orientation will be carried out by EBSD using a SEM. The corrosion resistance of the stainless steel, either without or with plastic deformation, will be studied by potentiodynamic polarization curves, Mott-Schottky approach and electrochemical impedance spectroscopy techniques in order to evaluate the effect of texture resulting from deformation on the passive film properties. The fatigue-corrosion resistance of the stainless steel samples with and without cold deformation will also be investigated to evaluate which metallurgical aspects affect the nucleation and propagation of fatigue cracks in the material. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

ALEXANDER H. RAMIREZ; CRISTIAANN H. RAMIREZ; ISOLDA COSTA. Influence of cold deformation on pitting corrosion resistance of ISO NBR 5832-1 austenitic stainless steel used for orthopedic implants. Journal of the Brazilian Chemical Society, v. 25, n. 7, p. 1270-1274, 2014-07-00. (12/50187-7)

RAMIREZ, ALEXANDER HINCAPIE; RAMIREZ, CRISTIAANN HINCAPIE; COSTA, ISOLDA. Cold Rolling Effect on the Microstructure and Pitting Resistance of the NBR ISO 5832-1 Austenitic Stainless Steel. International Journal of Electrochemical Science, v. 8, n. 12, p. 12801-12815, DEC 2013. (12/50187-7)