Microstructural and hardness evolution of mechanically alloyed Fe–Cr–Mn–N powders

Salahinejad, E.; Amini, Rasool; Bajestani, E. Askari; Hadianfard, M.J.

doi:10.1016/j.jallcom.2010.03.071

Cited by 32 publications

(23 citation statements)

References 26 publications

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“…Moreover, nitrogen intensifies the structural refinement, aiding amorphization. On the other hand, nitrogen in the Fe-Cr-Mn-N alloys increases the atomic size mismatch and negative heat of mixing among the constituent elements [14][15][16][17][18], encouraging amorphization significantly according to the Inoue's empirical rules [31].…”

Section: Structural Evolution During Mamentioning

confidence: 99%

“…Nitrogen alloying via MA can be accomplished by either milling under a nitrogen atmosphere or milling with proper nitrides under an inert gas. The generation of the high density of defects during MA increases the nitrogen solubility considerably [11][12][13][14][15][16][17][18][19]. In the recent years, noticeable researches on MA of Ni-free stainless steels under a nitrogen atmosphere have been also reported [11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Crystal interstitial sites contribution to nitrogen supersaturation in mechanically alloyed Fe–Cr–Mn–N alloys

Salahinejad

Amini

Ghaffari

et al. 2010

Journal of Alloys and Compounds

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Section: Structural Evolution During Mamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Crystal interstitial sites contribution to nitrogen supersaturation in mechanically alloyed Fe–Cr–Mn–N alloys

Salahinejad

Amini

Ghaffari

et al. 2010

Journal of Alloys and Compounds

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“…Apart from this contribution, as noted in the experimental section, the stainless steel powders were synthesized by mechanical alloying, a process that induces nanocrystallization and amorphization. 27,28,29,30,31,32 During sintering, the shorter duration of the 30 min sample results in lower grain/crystal growth; and the smaller the grain/crystallite size the higher the corrosion rate and ion release rate. 33 albeit from the stainless steel matrix.…”

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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“…Salahinejad et al reported hardness values above 1000 HV in mechanically alloyed powders of similar base composition. [30] This result can explain why the unconsolidated regions of the samples have much higher hardness values than the well-processed ones.…”

Section: A Grain Size and Morphologymentioning

confidence: 96%

Dispersoid Distribution and Microstructure in Fe-Cr-Al Ferritic Oxide Dispersion-Strengthened Alloy Prepared by Friction Consolidation

Catalini

Kaoumi

Reynolds

et al. 2015

Metall Mater Trans A

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INCOLOY Ò MA956 is a ferritic oxide dispersion-strengthened alloy manufactured by mechanical alloying followed by hot extrusion in vacuum-sealed cans or by degassing and hot isostatic pressing. This could be followed by a tailored heat treatment sequence in order to obtain a desired microstructure and to allow the oxide dispersion to precipitate. Three different oxides, responsible for the high-temperature mechanical strength, have been observed in this alloy: Y 4 Al 2 O 9 , YAlO 3 , and Y 3 Al 5 O 12 . Their sizes range from just a few to hundreds of nanometers. In this work, mechanically alloyed MA956 powder was consolidated via friction consolidation, a single-step and potentially cheaper processing alternative. Three fully dense compacts were produced. The compacts exhibited a refined, equiaxed grain structure with grain sizes smaller than 10 lm and the desired oxide dispersion. YAlO 3 and Y 3 Al 5 O 12 were identified by scanning electron microscopy, energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction. The size distribution of precipitates above 50 nm showed a direct proportionality between average precipitate size and grain size. The total energy input during processing was correlated with the relative amount of each of the oxides in the disks: the higher the total processing energy input, the higher the relative amount of Y 3 Al 5 O 12 precipitates. The elemental composition of the oxide precipitates was also probed individually by EDS, showing an aluminum enrichment trend as precipitates grew in size.

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Microstructural and hardness evolution of mechanically alloyed Fe–Cr–Mn–N powders

Cited by 32 publications

References 26 publications

Crystal interstitial sites contribution to nitrogen supersaturation in mechanically alloyed Fe–Cr–Mn–N alloys

Crystal interstitial sites contribution to nitrogen supersaturation in mechanically alloyed Fe–Cr–Mn–N alloys

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

Dispersoid Distribution and Microstructure in Fe-Cr-Al Ferritic Oxide Dispersion-Strengthened Alloy Prepared by Friction Consolidation

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