The Role of Silicon in the Reactive-Elements Effect on the Oxidation of Conventional Austenitic Stainless Steel

Paúl, A.; Sanchez, Rainier Garcia; Montes, O.; Odriozola, J.A.

doi:10.1007/s11085-006-9046-6

Cited by 50 publications

(17 citation statements)

References 23 publications

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“…This oxide has also been obtained by mechanochemical synthesis by grinding constituent oxides by Zhang [23]. The LaCrO 3 formation at high temperature on chromia forming alloys has been described by other authors [13,[24][25][26][27]. The present results indicate that the reaction between Cr 2 O 3 and La 2 O 3 occurs at the beginning of the oxidation process on all coated specimens.…”

Section: Discussionsupporting

confidence: 80%

Influence of Lanthanum Coatings on a Model 330 Alloy (Fe–35Ni–18Cr–2Si) Oxidation at High Temperatures

et al. 2013

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Abstract. The influence of a lanthanum sol-gel coating on the chromia scale adherence has been studied on the 330 alloy (Fe-35Ni-18Cr-2Si) oxidized at 900°C, in air. Argon annealing of lanthanum sol-gel coatings have been performed at various temperatures. Kinetic results show that lanthanum sol-gel coatings lead to a lower oxidation rate compared to blank specimens. On blank 330 specimens scale spallation is observed after cooling to room temperature. On the non-annealed sol-gel coated specimen and the argon annealed specimens at 600, 800 or 1000°C, the oxide scale formed at 900 °C is adherent after 48 hours isothermal oxidation. The adherent oxide scales are convoluted. It results from o an anionic and a cationic mixed diffusion process in the chromia scale Thermal cycling tests on lanthanum the sol-gel coated specimen show that the oxide scale remains adherent after 250 cycles. It is concluded that argon annealing of the lanthanum sol gel coating is not necessary to improve the scale adherence.

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Section: Discussionsupporting

confidence: 80%

Influence of Lanthanum Coatings on a Model 330 Alloy (Fe–35Ni–18Cr–2Si) Oxidation at High Temperatures

et al. 2013

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“…direct ''glass''/metal contact. Amorphous SiO 2 layers formed at the oxide/metal interface during oxidation of stainless steels are well documented [10,16,[29][30][31]. The smooth interfacial characteristics and complete coverage of the alloy surface could be characteristics of amorphous SiO 2 , observed predominantly in nonadherent heats.…”

Section: Discussion Of the Role Of Alloying Elements In Pre-oxidationmentioning

confidence: 94%

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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“…It should be noticed that they studied a manganese free substrate and that the comparison with manganese containing steels is then not very easy [46,47]. On the other hand, it appears that a too high amount of silicon induces more scale spallation between the alloy and the silica scale or at the silica/chromia interface [39].…”

Section: Influence Of Silicon Contentmentioning

confidence: 99%

330Cb alloy (Fe35Ni18Cr1Nb2Si) oxidation study between 800 and 1000 °C

Issartel¹,

Buscail²,

Nguyen³

et al. 2010

Materials & Corrosion

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The 330Cb alloy (Fe-35Ni-18Cr-1Nb-2Si) has been oxidized, in air, in the 800-1000 8C temperature range. Results show the formation of a chromia layer acting as a good diffusion barrier under isothermal conditions. Nevertheless, some oxide scale spallation is generally observed after cooling to room temperature. A fine and adherent chromia scale is only obtained after short-term oxidation at 800 8C. In this case, the scale is probably too fine to expect a protection against carburization. At 900 8C we have observed that the scale spalled off on the niobium rich alloy areas. At 1000 8C the scale adherence is very bad. This study shows that the oxide scale adherence is decreased when the 330Cb alloy oxidation duration is increased.

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The Role of Silicon in the Reactive-Elements Effect on the Oxidation of Conventional Austenitic Stainless Steel

Cited by 50 publications

References 23 publications

Influence of Lanthanum Coatings on a Model 330 Alloy (Fe–35Ni–18Cr–2Si) Oxidation at High Temperatures

Influence of Lanthanum Coatings on a Model 330 Alloy (Fe–35Ni–18Cr–2Si) Oxidation at High Temperatures

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

330Cb alloy (Fe35Ni18Cr1Nb2Si) oxidation study between 800 and 1000 °C

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