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García‐Alonso, M. C.; González-Carrasco, José Luis; Escudero, M.L.; Chao, Jesús

doi:10.1023/a:1004582713929

Cited by 20 publications

(13 citation statements)

References 25 publications

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“…Improved high temperature strength requires an anisotropic grain structure in the alloy. The fine oxide dispersions in ODS or RSP material are resistant to coarsening and dissolution at high temperature where recrystallisation of the FeCrAl grains would occur and thereby the large anisotropic grain structure needed for increased mechanical strength can be maintained [3,4,[27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Alumina Scale Formation on a Powder Metallurgical FeCrAl Alloy (Kanthal APMT) at 900–1,100 °C in Dry O2 and in O2 + H2O

et al. 2009

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A Rapidly Solidified Powder (RSP) metallurgical FeCrAl alloy, Kanthal APMT, was exposed in dry and humid O 2 for 72 h at 900-1,100°C. The formed oxide scales were characterized using gravimetry in combination with advanced analysis techniques (SEM, EDX, TEM, XRD, AES and SIMS). The oxide scales were at all exposures composed of two-layered a-Al 2 O 3 scales exhibiting a top layer of equiaxed grains and a bottom layer containing elongated grains. A Cr-rich zone, originating in the native oxide present before exposure, separated these two layers. The top a-Al 2 O 3 layer is suggested to have formed by transformation of outwardly grown metastable alumina, while the inward-grown bottom a-Al 2 O 3 layer had incorporated small Zr-, Hf-and Ti-rich oxide particles present in the alloy matrix. The scale also contained larger Y-rich oxide particles. Furthermore, in the temperature range studied, the presence of water vapour accelerated alloy oxidation somewhat and affected scale morphology.

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Section: Introductionmentioning

confidence: 99%

Alumina Scale Formation on a Powder Metallurgical FeCrAl Alloy (Kanthal APMT) at 900–1,100 °C in Dry O2 and in O2 + H2O

et al. 2009

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“…The first is that discrete, non-alumina particles form on the outer surface of the oxide, even after polishing back the oxide to remove any transient oxides and re-oxidizing. For instance, rutile (TiO 2 ) and yttrium-aluminate particles (Y/Al oxides) form on the oxide surface of MA956 alloys after oxidation 8,14 (alloy chemical compositions given in Table I). The formation of such particles requires Ti and Y ions to have diffused outward through the oxide.…”

Section: Introductionmentioning

confidence: 99%

Quantification of Aluminum Outward Diffusion During Oxidation of FeCrAl Alloys

2005

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The outward flux of aluminum during the oxidation of four similar aluminaforming alloys is determined using two types of experiments. One is measurement of the total thickness of the oxide and the ratio of the thickness of the characteristic equiaxed layer to the total oxide thickness. The second is measurement of the new oxide formed along the grain boundaries of the oxide upon re-oxidation. The former provides information about the ratio of outward diffusion of aluminum to inward diffusion of oxygen during oxidation. The latter experiment directly quantifies the outward flux of aluminum as a function of oxide thickness. Both the outward aluminum flux and the ratio of inward to outward diffusional fluxes are found to vary with the minor concentrations of "reactive element" alloying additions. Specifically, Y in solution in the alloy is found to limit outward aluminum diffusion more than Zr in solution, with Y 2 O 3 limiting aluminum diffusion more than Zr, Y, and ZrO 2 .

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“…The ODS FeCrAl alloy treated at 1 100°C generates a dense a-alumina layer, 13) which should be inert to the surrounding tissues.…”

Section: Discussionmentioning

confidence: 99%

“…The roughness of the sandblasted and polished samples was determined as less than 4 mm and 0.2 mm, respectively. The microstructure of the alloy in the as-received condition consists of very small grains slightly elongated in the longitudinal bar direction, 13) about 4-5 mm in length and 0.5 mm in width.…”

Section: Methodsmentioning

confidence: 99%

Effect of Sandblasting on the Oxidation and Corrosion Behaviour of an Oxide-Dispersed Strengthened (ODS) FeCrAl Alloy.

et al. 2001

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Metallic biomaterials are preferred for replacements of the hard tissues since they are the most suitable to withstand the mechanical loads. For same components the higher surface roughness is preferred to increase the adherence and anchorage between the implant and the bone. In this work sandblasting prior to the oxidation is used to increase the surface roughness of the oxide dispersion strengthened (ODS) FeCrAl alloy. The effect of sandblasting on its oxidation and corrosion behaviour is studied. As a comparison, polished samples are also studied. The alloy treated at 1 100°C generates a dense a-alumina layer which thickness increases with increasing exposure time, being the values somewhat lower for the sandblasted samples. Impedance diagrams obtained for sandblasted samples preoxidised for 1 and 3 h show impedance values at the lowest frequency two orders of magnitude lower than those for polished samples. This decrease in the impedance value can be attributed to the presence of paths or fine cracks in the alumina layer that communicate the aggressive medium with the metallic substrate. Spallation of the alumina layer in preoxidised sandblasted samples has been detected by electrochemical impedance spectroscopy for treatment times of 10 and 100 h. Despite this loss of the scale integrity, the corrosion behaviour is good.

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Cited by 20 publications

References 25 publications

Alumina Scale Formation on a Powder Metallurgical FeCrAl Alloy (Kanthal APMT) at 900–1,100 °C in Dry O2 and in O2 + H2O

Alumina Scale Formation on a Powder Metallurgical FeCrAl Alloy (Kanthal APMT) at 900–1,100 °C in Dry O2 and in O2 + H2O

Quantification of Aluminum Outward Diffusion During Oxidation of FeCrAl Alloys

Effect of Sandblasting on the Oxidation and Corrosion Behaviour of an Oxide-Dispersed Strengthened (ODS) FeCrAl Alloy.

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