Effect of precipitates on the corrosion?fatigue crack initiation of ISO 5832-9 stainless steel biomaterial

Giordani, E.J.; Guimarães, Valdir Alves; pinto, Thomas; Ferreira, Itamar

doi:10.1016/j.ijfatigue.2004.03.002

Cited by 57 publications

(43 citation statements)

References 20 publications

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“…Austenitic stainless steel with high nitrogen content, when compared with others stainless steels, presents increased mechanical strength and corrosion resistance, providing better performance in its use on the human body 1 . In 1992, the International Organization for Standardization specified the ISO 5832-9 fixing composition limits of 22Cr -10.6 Ni -2.4 Mo -Nb 0.42-0.37 N, describes the features and defines test methods to austenitic stainless steels with high nitrogen used in orthopedic implants.…”

Section: Introductionmentioning

confidence: 99%

Prediction of hot flow plastic curves of ISO 5832-9 steel used as orthopedic implants

et al. 2014

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An austenitic stainless steel ISO 5832-9 used as a biomaterial was torsion-deformed over the temperature range of 1000-1200 °C and strain rates of 0.05, 0.1, 1.0 and 5.0 s -1 . The flow stress curves obtained showed two regions where firstly there is a rising on stress characterized as work hardening mechanism acting and secondly a decreasing in work-softening after a peak stress. The flow curves were modeled by adjusting the experimental data with Zener-Hollomom parameter to construct the constitutive equations that describe the plastic behavior in both regions. The first region was described until the peak stress, taking into consideration the competition between work hardening and recovery while the second one was described applying the softening time of 50% and the Avrami equation. In some hot deformation conditions the simulated curves showed good agreement with the experimental ones while in others conditions the simulated showed differences to experimental curves that was discussed and associated with other mechanisms that acted during hot deformation.

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Section: Introductionmentioning

confidence: 99%

Prediction of hot flow plastic curves of ISO 5832-9 steel used as orthopedic implants

et al. 2014

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“…Entretanto as expectativas apontavam no sentido oposto, uma vez que o aço ISO 5832-9 apresentou propriedades mecânicas e de corrosão superiores às do aço F 138. Estudos sobre o mecanismo de nucleação de trincas por fadiga e fadiga-corrosão nesse aço (17) mostraram que as trincas de fadiga nuclearam quase que exclusivamente em descontinuidades geométricas associadas com a ruptura de partículas de precipitados da fase Z. Essas descontinuidades geomé-tricas, muitas delas geradas já no primeiro ciclo de carregamento, sob condições de deformação plástica, favorecem o estabelecimento de condições muito agressivas do eletrólito estagnado no seu interior, criando condições favoráveis ao processo de corrosão em frestas, que, por sua vez, contribui com a redução acentuada no período de nucleação de trincas por fadiga. O estudo sugere que a presença de partículas grosseiras da fase Z, no aço ISO 5832-9, favorece a formação de descontinuidades geométricas pela ruptura dessas partículas, prejudicando as propriedades de fadiga e fadiga-corrosão desse material.…”

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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“…When the particles are small, they tend to decrease the mobility of grain boundaries formed upon straining by dynamic recrystallization and during the interpass time by static and metadynamic recrystallization. In turn, when precipitates coalesce, a degradation of fatigue properties and corrosion resistance of the material is noticed [11][12][13][14][15][16]. The formation of Z-phase is unclear at present and not well established whether it is formed from prior nitride precipitates as proposed by some authors [13,[17][18][19] or directly nucleated as suggested by others [8,20,21].…”

Section: Accepted Manuscriptmentioning

confidence: 97%

Thermomechanical controlled processing to achieve very fine grains in the ISO 5832-9 austenitic stainless steel biomaterial

Silva

Cabrera

Balancin

et al. 2017

Materials Characterization

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Simulations of thermomechanical processing of a high niobium-and nitrogen-bearing austenitic stainless steel for orthopedic implants (ISO 5832-9) were conducted using hot torsion test with multiple deformations under continuous cooling conditions. Samples were reheated to 1250 o C and subjected to deformation schedules with pass strain of 0.3, strain rate of 1 s -1 and interpass times of 5, 20 and 50 seconds. Optical microscopy, TEM, EDS and EBSD were used to characterize the samples. Characterization of precipitates indicated that only TiNbN was undissolved after soaking, while Z-phase and NbN precipitated during on cooling deformation schedules. The evolution of grain and precipitate sizes with deformation conditions were studied and related to both grain refinement, and mechanical behavior observed. The critical grain size limited by precipitates was calculated using the values obtained for size and volume fraction of precipitates. Differences observed between calculated and measured values were discussed.Keywords: Thermomechanical controlled processing, Niobium, Strain-induced precipitation, Recrystallization, Grain Refinement, Stainless steel. ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T2 Thermomechanical controlled processing to achieve very fine grains in the ISO 5832-9 Austenitic Stainless Steel Biomaterial AbstractSimulations of thermomechanical processing of a high niobium-and nitrogen-bearing

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Effect of precipitates on the corrosion?fatigue crack initiation of ISO 5832-9 stainless steel biomaterial

Cited by 57 publications

References 20 publications

Prediction of hot flow plastic curves of ISO 5832-9 steel used as orthopedic implants

Prediction of hot flow plastic curves of ISO 5832-9 steel used as orthopedic implants

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

Thermomechanical controlled processing to achieve very fine grains in the ISO 5832-9 austenitic stainless steel biomaterial

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