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Fujikawa, Hisao; Morimoto, T.; Nishiyama, Yoshitaka; Newcomb, S. B.

doi:10.1023/a:1023061814413

Cited by 46 publications

(32 citation statements)

References 5 publications

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“…6 and 9, a wedge-shaped internal oxide consisting of SiO 2 was observed for the electrodeposited steel. Therefore, it is thought that for the electrodeposited steel, the wedgeshaped internal oxide consisting of SiO 2 was formed according to the same mechanism that was proposed by Fujikawa et al 20 , and this oxide inhibited the spallation of the scale. Bautista et al 21 added Y 2 O 3 to sintered stainless steels (ferritic and austenitic steels), and examined the oxidation resistance of these steels.…”

Section: Discussionmentioning

confidence: 75%

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Improvement in Oxidation Resistance of Stainless Steel by Molten-Salt Electrodeposition of La

2004

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Improvement in the oxidation resistance of SUS304 stainless steel was accomplished by electrodeposition of La in a molten salt. The electrolysis of La was conducted using a potentiostatic-polarization method in an equimolar NaCl-KCl melt containing 3.5 mol.% LaF 3 at 1023 K. Observation of the specimen surface after polarization at −1.8 V (vs. Ag/Ag + (0.1)) for 0.18 ks showed that La particles were uniformly dispersed on the surface. The oxidation resistance of the electrodeposited stainless steel was significantly improved as compared with the untreated stainless steel. The scale formed on the untreated stainless steel after oxidation was thick and consisted of Fe 2 O 3 and Fe 3 O 4 , whereas the scale formed on the elecrodeposited stainless steel was extremely thin, and mainly consisted of Cr 2 O 3 .

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Section: Discussionmentioning

confidence: 75%

“…Fujikawa et al 20 added 0.03 wt.% Y to an austenitic stain- less steel containing a small amount of Si. The oxidation resistance of this steel at 1173, 1273 and 1373 K in air, was studied and analyzed after oxidation using scanning-electron microscopy, secondary-ion mass spectroscopy, and transmission-electron microscopy.…”

Section: Discussionmentioning

confidence: 99%

Improvement in Oxidation Resistance of Stainless Steel by Molten-Salt Electrodeposition of La

2004

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“…Although 304L is generally not considered for high-temperature oxidizing applications, the oxidation of 304L and similar alloys has been studied by several researchers [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Most previous work was performed in high pO 2 environments, such as air, and was concerned with the long-term oxidation resistance of the alloys.…”

Section: Glass Insertmentioning

confidence: 99%

“…In these investigations, oxide spallation was more prevalent in alloys with higher Si content; for example, Park et al [15] reported spallation for alloys with [0.5 wt% Si. Oxide spallation occurred in samples with a more continuous layer of SiO 2 at the oxide/alloy interface [6,10,15,18]. In addition, higher Si generally results in slower oxidation kinetics [9,10] (better oxidation resistance).…”

Section: Glass Insertmentioning

confidence: 99%

The Effects of Pre-Oxidation and Alloy Chemistry of Austenitic Stainless Steels on Glass/Metal Sealing

et al. 2009

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An oxidation treatment is often performed on austenitic stainless steel prior to joining to alkali barium silicate glass to produce hermetic seals. The thin oxide formed during this pre-oxidation step acts as a transitional layer and a source of Cr and other elements that diffuse into the glass during the subsequent bonding process. Pre-oxidation is performed in a low pO 2 atmosphere to avoid iron oxide formation; the final oxide is composed of Cr 2 O 3 , MnCr 2 O 4 spinel, and SiO 2 . Significant heat-to-heat variations in the oxidation behavior of austenitic stainless steel were observed in this work, resulting in inconsistent glass/metal seal behavior. Twenty-five (25) stainless steel heats were examined including 304L, 316L, and experimental high sulfur alloys similar to 303SS. The objectives were to characterize the oxidation kinetics, the oxide morphologies, and compositions that affect glass/ metal adhesion. It was found that poor glass sealing is associated with a more continuous layer of SiO 2 at the metal/oxide interface. The effects of alloy chemistry, in particular Mn and Si concentrations, on glass/metal sealing behavior were empirically determined. A criterion based on the Mn/Si ratio was developed for use in selecting heats with good glass/metal bonding characteristics. To test this criterion, four other austenitic stainless steels were evaluated: 21-6-9 (also known by original Armco Steel Co. trade name Nitronic Ò 40), 22-13-5 (Nitronic Ò 50), Nitronic Ò 60, and Gall-Tough Ò (Carpenter Technology Corp.). These alloys have compositions significantly different from 300-series alloys, but they were still found to comply with the compositional guidelines developed for predicting glass/metal adhesion.

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“…Further improvements have been brought about by rare-earth element additions and such alloys are known to exhibit good oxidation resistance [3][4][5][6][7][8][9][10][11][12][13]. More studies of alumina scale structures and the effect of dopant elements were carried out in the ferritic steels such as FeCrAl alloy [4][5][6][7][8][9][10][11] than in austenitic alloys such as NiCrAl alloy [12][13][14][15]. The authors made clear the role of S as a tramp element and Y as dopant element in the high-temperature oxidation of austenitic steels before [14,16,17].…”

Section: Introductionmentioning

confidence: 99%

High Temperature Oxidation Behaviour of High Al Content Ferritic and Austenitic Stainless Steels With and Without Rare-Earth Element Addition

Fujikawa

Newcomb

2011

Oxid Met

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The oxidation behaviour of austenitic and ferritic alloys containing 4% Al and rare-earth element addition of (La ? Ce) has been investigated, and comparisons made to an austenitic alloy with no such addition. The alloys were all found to exhibit good oxidation resistance; although, such resistance was highest when the alloy contained rare-earth elements. The addition led to a reduction in the amount of scale spalling. The scales formed after 10 and 100 h at 1,000°C were examined using transmission electron microscopy and found to have bi-layered microstructures. The dislocation density and an amount of distortion in the scale were found to differ, depending on the absence or presence of (La ? Ce) in the metal. It was observed that the outer-to-inner layer thickness ratio changed with time and the rare-earth element addition promoted growth of the inner layer relative to the outer layer. Analysis of the scale compositions demonstrated an apparent synergistic relationship between the effects of the rare-earth element addition and the degree to which iron is incorporated within the scales. The results are discussed in relation to the relative oxidation performance of the austenitic and ferritic alloys.

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Cited by 46 publications

References 5 publications

Improvement in Oxidation Resistance of Stainless Steel by Molten-Salt Electrodeposition of La

Improvement in Oxidation Resistance of Stainless Steel by Molten-Salt Electrodeposition of La

The Effects of Pre-Oxidation and Alloy Chemistry of Austenitic Stainless Steels on Glass/Metal Sealing

High Temperature Oxidation Behaviour of High Al Content Ferritic and Austenitic Stainless Steels With and Without Rare-Earth Element Addition

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