Microstructure and mechanical properties of a new group of nanocrystalline medical-grade stainless steels prepared by powder metallurgy

Javanbakht, M.; Hadianfard, M.J.; Salahinejad, E.

doi:10.1016/j.jallcom.2014.11.080

Cited by 25 publications

(4 citation statements)

References 24 publications

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“…Recently, the structure and some properties of powder metallurgy (mechanical alloying and liquid-phase sintering) samples with the latter standard composition were investigated. 21,22,23 Typically, it was found that a higher resistance to uniform corrosion, estimated from EIS experiments, dictates a more cell viability on the surfaces, albeit when liquid-phase sintering was completely activated. 10 Nevertheless, the question is whether this conclusion is universal, i.e.…”

mentioning

confidence: 99%

Is cell viability always directly related to corrosion resistance of stainless steels?

Salahinejad

Ghaffari

Vashaee

et al. 2016

Materials Science and Engineering: C

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It has been frequently reported that cell viability on stainless steels is improved by increasing their corrosion resistance. The question that arises is whether human cell viability is always directly related to corrosion resistance in these biostable alloys. In this work, the microstructure and in vitro corrosion behavior of a new class of medical-grade stainless steels were correlated with adult human mesenchymal stem cell viability. The samples were produced by a powder metallurgy route, consisting of mechanical alloying and liquid-phase sintering with a sintering aid of a eutectic Mn-Si alloy at 1050 °C for 30 and 60 min, leading to nanostructures. In accordance with transmission electron microscopic studies, the additive particles for the sintering time of 30 min were not completely melted. Electrochemical impedance spectroscopic experiments suggested the higher corrosion resistance for the sample sintered for 60 min; however, a better cell viability on the surface of the less corrosion-resistant sample was unexpectedly found. This behavior is explained by considering the higher ion release rate of the Mn-Si additive material, as preferred sites to corrosion attack based on scanning electron microscopic observations, which is advantageous to the cells in vitro. In conclusion, cell viability is not always directly related to corrosion resistance in stainless steels. Typically, the introduction of biodegradable and biocompatible phases to biostable alloys, which are conventionally anticipated to be corrosion-resistant, can be advantageous to human cell responses similar to biodegradable metals.

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mentioning

confidence: 99%

Is cell viability always directly related to corrosion resistance of stainless steels?

Salahinejad

Ghaffari

Vashaee

et al. 2016

Materials Science and Engineering: C

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“…Steels powders are widely used in an extensive range of industrial fields such as aerospace [68], automotive [69], oil and gas industries [70], biomedical engineering [7,68,71], and other fields, owing to their high ductility and high strength [72], biocompatibility and, considering stainless steel powders, also to their high corrosion resistance [68,72]. Austenitic stainless steel powders show however low hardness and relatively poor wear resistance; a strategy for improving the hardness and the wear resistance is coating the metal powders using ceramic nanoparticles (e.g., TiB 2 ) acting as a grain refiner.…”

Section: Base Metal Powdersmentioning

confidence: 99%

Coated Metal Powders for Laser Powder Bed Fusion (L-PBF) Processing: A Review

Bidulský¹,

Gobber

Bidulská

et al. 2021

Metals

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In the last years, functionalized powders are becoming of increasing interest in additive manufacturing (particularly in laser powder bed fusion processing, L-PBF), due to their improved flowability and enhanced processability, particularly in terms of laser absorbance. Functionalized powders may also provide higher final mechanical or physical properties in the manufactured parts, like an increased hardness, a higher tensile strength, and density levels close to theoretical. Coatings represent a possible interesting approach for powders’ functionalizing. Different coating methods have been studied in the past years, either mechanical or non-mechanical. This work aims to present an overview of the currently obtained coated powders, analyzing in detail the processes adopted for their production, the processability of the coated systems, and the mechanical and physical properties of the final parts obtained by using L-PBF for the powders processing.

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“…Powder metallurgy is one of the promising processing methods to improve the alloy composition [18,27]. This research has attempted to further accelerate this technique for not only developing the alloy composition but also the surface nitride the layer of implant material with an aim to minimize the ionic leaching of nickel and other elements.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Surface Nitriding and Characterization of Ti-Nb Modified 316L Stainless Steel Alloy Using Powder Metallurgy

et al. 2021

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The powder metallurgy (PM) technique has been widely used for producing different alloy compositions by the addition of suitable reinforcements. PM is also capable of producing desireable mechanical and physical properties of the material by varying process parameters. This research investigates the addition of titanium and niobium in a 316L stainless steel matrix for potential use in the biomedical field. The increase of sintering dwell time resulted in simultaneous sintering and surface nitriding of compositions, using nitrogen as the sintering atmosphere. The developed alloy compositions were characterized using OM, FESEM, XRD and XPS techniques for quantification of the surface nitride layer and the nitrogen absorbed during sintering. The corrosion resistance and cytotoxicity assessments of the developed compositions were carried out in artificial saliva solution and human oral fibroblast cell culture, respectively. The results indicated that the nitride layer produced during sintering increased the corrosion resistance of the alloy and the developed compositions are non-cytotoxic. This newly developed alloy composition and processing technique is expected to provide a low-cost solution to implant manufacturing.

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Microstructure and mechanical properties of a new group of nanocrystalline medical-grade stainless steels prepared by powder metallurgy

Cited by 25 publications

References 24 publications

Is cell viability always directly related to corrosion resistance of stainless steels?

Is cell viability always directly related to corrosion resistance of stainless steels?

Coated Metal Powders for Laser Powder Bed Fusion (L-PBF) Processing: A Review

Synthesis, Surface Nitriding and Characterization of Ti-Nb Modified 316L Stainless Steel Alloy Using Powder Metallurgy

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