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Alumina scale formation on a powder metallurgical FeCrAl alloy (Kanthal APMT) at 900-1100 °C in dry O2 and in O2 + H2O
Högskolan Dalarna, Akademin Industri och samhälle, Materialvetenskap.
Vise andre og tillknytning
2010 (engelsk)Inngår i: Oxidation of Metals, ISSN 0030-770X, E-ISSN 1573-4889, Vol. 73, nr 1-2, s. 233-253Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A Rapidly Solidified Powder (RSP) metallurgical FeCrAl alloy, Kanthal APMT, was exposed in dry and humid O2 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 andSIMS). The oxide scales were at all exposures composed of two-layered α-Al2O3 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 α-Al2O3layer is suggested to have formed by transformation of outwardly grown metastable alumina, while the inward-grown bottom α-Al2O3 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.

sted, utgiver, år, opplag, sider
Springer, 2010. Vol. 73, nr 1-2, s. 233-253
Emneord [en]
FeCrAl; Oxidation; Alumina scale
HSV kategori
Forskningsprogram
Stålformning och ytteknik
Identifikatorer
URN: urn:nbn:se:du-4716DOI: 10.1007/s11085-009-9177-7ISI: 000273481500014OAI: oai:dalea.du.se:4716DiVA, id: diva2:520196
Tilgjengelig fra: 2010-05-24 Laget: 2010-05-24 Sist oppdatert: 2017-12-07bibliografisk kontrollert

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Engkvist, JosefinOlsson, Mikael
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