The addition of silver affects the deformation mechanism of a twinning-induced plasticity steel: Potential for thinner degradable stents

Loffredo, Sergio; Paternoster, Carlo; Giguère, Nicolas; Barucca, G.; Vedani, Maurizio

doi:10.1016/j.actbio.2019.04.030

Cited by 15 publications

(18 citation statements)

References 54 publications

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“…This was reported for a variety of alloy systems prepared by different casting and forming technologies . Especially, FeMnC‐base alloys are promising candidates due to their higher strength and improved cell compatibility compared with many FeMn systems . This work is based on a novel developed FeMnCS alloy, which already shows an attractive combination of mechanical properties under tensile load, corrosion rate, and cell compatibility in the as‐cast state, as shown in previous studies …”

Section: Introductionmentioning

confidence: 63%

“…Among the biodegradable alloys, Fe‐based systems, especially those on FeMn base, are very promising, e.g., for cardiovascular applications due to their excellent processability, a broad range of tunable mechanical properties, their high integrity during degradation, as well as degradation reactions without hydrogen gas evolution in physiological media. This was reported for a variety of alloy systems prepared by different casting and forming technologies . Especially, FeMnC‐base alloys are promising candidates due to their higher strength and improved cell compatibility compared with many FeMn systems .…”

Section: Introductionmentioning

confidence: 73%

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Effect of Selective Laser Melting on Microstructure, Mechanical, and Corrosion Properties of Biodegradable FeMnCS for Implant Applications

et al. 2020

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Currently, additive manufacturing, e.g., selective laser melting (SLM), of biodegradable metals and alloys for implant applications is drawing increasing attention. [1-5] This new class of materials is of highest interest as it enables progressive implant degradation after providing temporary support on the healing processes of the diseased tissue. So, revision surgery, chronic inflammation, or lacking adaptation to growth (regarding diseases at infancy) can be avoided. [6-8] Among the biodegradable alloys, Fe-based systems, especially those on FeMn base, are very promising, e.g., for cardiovascular applications due to their excellent processability, a broad range of tunable mechanical properties, their high integrity during degradation, as well as degradation reactions without hydrogen gas evolution in physiological media. This was reported for a variety of alloy systems prepared by different casting and forming technologies. [7-16] Especially, FeMnC-base alloys are promising candidates due to their higher strength and improved cell compatibility compared with many FeMn systems. [11-15] This work is based on a novel developed FeMnCS alloy, which already shows an attractive combination of mechanical properties under tensile load, corrosion rate, and cell compatibility in the as-cast state, as shown in previous studies. [11,14] However, there are still challenges regarding a more homogenous degradation for good temporary structural integrity, an adequate corrosion rate, as well as improved mechanical properties which are comparable or better than those of clinically applied 316L benchmark steel. Until now, there are only a few published studies on the processing of biodegradable Mg-, Zn-, or Fe-based alloys by means of SLM. [1-4,17-20] However, the layer-by-layer technique offers a flexible production of parts with a high degree of individualization or complex geometries and a high level of function integration, which can often not be generated by conventional manufacturing techniques. [21,22] Furthermore, SLM is a rapid solidification technique, which yields particular microstructural phenomena like grain refinement, extended solid solubility and reduction of quantity, and size of phase segregations. These effects can be very beneficial for the properties of metallic biomaterials as it was already demonstrated by different authors for various nondegradable materials like 316L, Ti-based, or CoCr-based alloys, also partially considering the influence of the SLM building orientation. [21-29] Consequently, the exploitation of advantages of SLM for the production of patient-specific degradable implants with tailored microstructures appears to be a promising approach.

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Section: Introductionmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 73%

Effect of Selective Laser Melting on Microstructure, Mechanical, and Corrosion Properties of Biodegradable FeMnCS for Implant Applications

et al. 2020

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“…In these tests, silver did not show any cytotoxicity or thrombosis effect. Loffredo et al tested the difference between Fe-16Mn-0.7C alloy and Fe-16Mn-0.7C-0.4Ag [ 108 ]. As a result, it was shown that the presence of silver decreased the ductility caused by the development of mechanical ε-martensite.…”

Section: Iron Materials Modificationsmentioning

confidence: 99%

Biodegradable Iron-Based Materials—What Was Done and What More Can Be Done?

2021

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Iron, while attracting less attention than magnesium and zinc, is still one of the best candidates for biodegradable metal stents thanks its biocompatibility, great elastic moduli and high strength. Due to the low corrosion rate, and thus slow biodegradation, iron stents have still not been put into use. While these problems have still not been fully resolved, many studies have been published that propose different approaches to the issues. This brief overview report summarises the latest developments in the field of biodegradable iron-based stents and presents some techniques that can accelerate their biocorrosion rate. Basic data related to iron metabolism and its biocompatibility, the mechanism of the corrosion process, as well as a critical look at the rate of degradation of iron-based systems obtained by several different methods are included. All this illustrates as the title says, what was done within the topic of biodegradable iron-based materials and what more can be done.

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“…Due to their outstanding mechanical properties, e.g. high ductility (deformation at rupture, A ≈ 20%) and strength (yielding strength, σ Y ≈ 620 MPa) [ 4 , 5 ], and their appropriate corrosion behavior (0.13 ± 0.01 to 0.24 ± 0.03 mm/year) [ 6 , 7 ], this new class of alloys is particularly attractive for thinner implants [ 8 ], such as stents, as they present more favorable mechanical properties than those of Mg-based ones [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Surface processing for iron-based degradable alloys: A preliminary study on the importance of acid pickling

Andrade

Paternoster

Chevallier

et al. 2022

Bioactive Materials

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The formation of a heterogeneous oxidized layer, also called scale, on metallic surfaces is widely recognized as a rapid manufacturing event for metals and their alloys. Partial or total removal of the scale represents a mandatory integrated step for the industrial fabrication processes of medical devices. For biodegradable metals, acid pickling has already been reported as a preliminary surface preparation given further processes, such as electropolishing. Unfortunately, biodegradable medical prototypes presented discrepancies concerning acid pickling studies based on samples with less complex geometry (e.g., non-uniform scale removal and rougher surface). Indeed, this translational knowledge lacks a detailed investigation on this process, deep characterization of treated surfaces properties, as well as a comprehensive discussion of the involved mechanisms. In this study, the effects of different acidic media (HCl, HNO 3 , H 3 PO 4 , CH 3 COOH, H 2 SO 4 and HF), maintained at different temperatures (21 and 60 °C) for various exposition time (15–240 s), on the chemical composition and surface properties of a Fe–13Mn-1.2C biodegradable alloy were investigated. Changes in mass loss, morphology and wettability evidenced the combined effect of temperature and time for all conditions. Pickling in HCl and HF solutions favor mass loss (0.03–0.1 g/cm 2 ) and effectively remove the initial scale.

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The addition of silver affects the deformation mechanism of a twinning-induced plasticity steel: Potential for thinner degradable stents

Cited by 15 publications

References 54 publications

Effect of Selective Laser Melting on Microstructure, Mechanical, and Corrosion Properties of Biodegradable FeMnCS for Implant Applications

Effect of Selective Laser Melting on Microstructure, Mechanical, and Corrosion Properties of Biodegradable FeMnCS for Implant Applications

Biodegradable Iron-Based Materials—What Was Done and What More Can Be Done?

Surface processing for iron-based degradable alloys: A preliminary study on the importance of acid pickling

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