Influence of Tantalum on the Rates of High Temperature Oxidation and Chromia Volatilization for Cast (Fe and/or Ni)-30Cr-0.4C Alloys

Patrice Berthod; Yassin Hamini; Lionel Aranda

doi:10.4028/www.scientific.net/MSF.595-598.861

Paper Titles

A Model for Transitions in Oxidation Regimes of ZrB₂
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Investigation of the Development Processes of Self-Organizing, Protective Oxide Scales and Wear Resistant Surface Layers on the Fe-44%Cr-1%Ni-4%Al-0.3%La Alloy
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The Effect of Water Vapour and Sulphur on Corrosion Mechanisms of Steels
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Effects of Microstructural Arrangement on Hot Corrosion Resistance of a Pb-Sb Alloy for Battery Grids
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Influence of Tantalum on the Rates of High Temperature Oxidation and Chromia Volatilization for Cast (Fe and/or Ni)-30Cr-0.4C Alloys
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Study of the Behavior in Oxidation at High Temperature of Ni, Co and Fe-Base Alloys Containing Very High Fractions of Carbides
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Microstructure Influence on Residual Stresses in Growing Chromia Oxide Films as Determined by In Situ High Temperature Raman Spectroscopy
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High Resolution MicroRaman Study of Blisters in Cr₂O₃ Thermal Oxide Films
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Yttrium Implantation and Manganese Addition Element Effects on the High Temperature Oxidation Resistance of a Model Steel
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Influence of Tantalum on the Rates of High Temperature Oxidation and Chromia Volatilization for Cast (Fe and/or Ni)-30Cr-0.4C Alloys

Abstract:

Four cast superalloys, Fe-base and (Fe,Ni)-base alloys, all containing 30%Cr and 0.4%C, were elaborated with addition of 3% and 6% of tantalum. Their oxidation behaviours were studied at 1000, 1100 and 1200°C during 50 hours. The oxidized surfaces of the samples were quantitatively characterized by measurements of thicknesses and surface fractions of internal oxides. The thermogravimetry files were treated according to the {m×(dm/dt) = Kp - Kv×m} equation, to obtain simultaneously the parabolic constant and the chromia volatilization constant. The internal tantalum oxides are more present in the Fe-base alloys and the carbide-free zones are less developed for the (Fe,Ni)-base alloys than for the others. The Fe-base alloys oxidize faster than the (Fe,Ni)-base and Ni-base alloys. The comparison with the corresponding Ta-free ternary alloys shows that the presence of Ta tends to accelerate the oxidation.