Fatigue processes in metals—role of aqueous environments

Sudarshan, T. S.; Srivatsan, T. S.; Harvey, D. P.

doi:10.1016/0013-7944(90)90262-f

Cited by 37 publications

(13 citation statements)

References 82 publications

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“…Sudarshan e colaboradores (16) defendem que o contato com o meio agressivo tem o mesmo efeito sobre a vida em fadiga que o de um entalhe agudo usinado na superfície do metal, que, por sua vez, age como concentrador de tensões, facilitando a nucleação precoce de trincas por fadiga. Dessa forma, supõe-se que o meio corrosivo simplesmente facilita a formação de descontinuidades geométricas (pites de corrosão) na superfície previamente lisa de corpos de prova metálicos.…”

Section: Discussionunclassified

Propriedades mecânicas e de corrosão de dois aços inoxidáveis austeníticos utilizados na fabricação de implantes ortopédicos

Giordani

Ferreira

Balancin

2007

Rem: Rev. Esc. Minas

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Embora o aço inoxidável austenítico tipo ASTM F 138 seja o material metálico mais utilizado na fabricação de implantes ortopédicos, alguns aspectos como baixa resistência mecânica, quando na condição recozido, e suscetibilidade à corrosão localizada limitam o emprego mais amplo desse material. Recentemente, o aço inoxidável austenítico com alto nitrogênio de classificação ISO 5832-9 vem sendo indicado como substituto ao F 138, principalmente para aplicações mais críticas, envolvendo carregamentos mais severos e longos períodos de permanência no interior do corpo humano. Nesse trabalho, fez-se a caracterização das microestruturas dos dois aços, avaliaram-se, comparativamente, as propriedades mecânicas básicas, as propriedades de corrosão e de fadiga dos dois aços. O aço ISO 5832-9 apresentou comportamentos mecânico e eletroquímico bastante superior ao aço ASTM F138. A combinação dessas características rendeu a esse material melhor desempenho em fadiga em meio neutro e em meio agressivo. Avalia-se o papel do nitrogênio, tanto em solução sólida, quanto combinado com o nióbio formando a fase Z, e discutem-se os fatores que levam à superioridade nas propriedades do aço ISO 5832-9.
ASTM F 138 austenitic stainless steel is extensively used as an orthopedic implant material. However, some aspects, such as low strength in the annealed condition and susceptibility to localized corrosion, limit wider use of this kind of steel. Recently, a high-nitrogen austenitic stainless steel, specified in the standard ISO 5832-9, has been indicated as an alternative to ASTM F 138 steel for more severe loading and permanent application inside the human body. In this work, microstructure, mechanical properties, corrosion resistance and fatigue behavior of both steels were determined and compared. ISO 5832-9 steel displayed better mechanical and corrosion behaviors than did ASTM F 138 steel. The combination of these features lead ISO steel to enhanced fatigue performance in both neutral and aggressive environments. Analyzed were the role of nitrogen in solid solution, combined with niobium in the Z-phase, and the factors that led to superior ISO 5832-9 properties

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Section: Discussionunclassified

Propriedades mecânicas e de corrosão de dois aços inoxidáveis austeníticos utilizados na fabricação de implantes ortopédicos

Giordani

Ferreira

Balancin

2007

Rem: Rev. Esc. Minas

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“…It was reported that the initiation of fatigue cracks in stainless steel was closely correlated to the corrosion pits [22,23]. In a long-term application, corrosion would not only degrade the implant mechanical function but also be likely to release ions such as iron, chromium, nickel and molybdenum to human body [24][25][26].…”

Section: Stainless Steelmentioning

confidence: 99%

State of the art of bioimplants manufacturing: part I

Kang

Fang

2018

Adv. Manuf.

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Bioimplants are becoming increasingly important in the modern society due to the fact of an aging population and associated issues of osteoporosis and osteoarthritis. The manufacturing of bioimplants involves an understanding of both mechanical engineering and biomedical science to produce biocompatible products with adequate lifespans. A suitable selection of materials is the prerequisite for a long-term and reliable service of the bioimplants, which relies highly on the comprehensive understanding of the material properties. In this paper, most biomaterials used for bioimplants are reviewed. The typical manufacturing processes are discussed in order to provide a perspective on the development of manufacturing fundamentals and latest technologies. The review also contains a discussion on the current measurement and evaluation constraints of the finished bioimplant products. Potential future research areas are presented at the end of this paper.

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“…These discontinuities or stress risers then become the potential sites for origination of fatigue cracks upon cyclic loading. The mechanisms of initiation and growth of crack in corrosive environment [41] are discussed below (It is important to mention here that no single mechanism can fully explain crack initiation or crack propagation behaviour of metals in corrosive environment):…”

Section: Fatigue Under Aqueous and Corrosive Environmentsmentioning

confidence: 99%