Surface preparation effect on oxidation kinetics of Ni-base superalloy

Abstract

Abstract. In the present study an oxidation behavior of commercially available Ni-base superalloy IN 713C with different surface finishing, namely polished up to 1 μm diamond paste (resulting in R a =0.023) and ground by SiC paper with 80 grit (R a =1.23), were investigated at 950°C in air. It was found that ground sample developed very thin, protective α-Al 2 O 3 scale. Moreover, locally formation of θ-Al 2 O 3 in the forms of spikes was observed. For the sample with polished surface formation of outer chromia scale accompanied with internal oxidation of aluminum was observed. Moreover, for specimen which does not form continuous alumina scale or sub-scale, the GD-OES depth profiles showed an enrichment of boron at the oxide scale/alloy interface. It was proposed that the formation of protective alumina scale on ground samples is caused by introducing the defects into the near-surface region of the material, which are an easy diffusion paths for the elements forming a protective oxide scales.

Effect of surface mechanical treatment on the oxidation behavior of FeAl-model alloy

“…For materials used at elevated temperatures, their oxidation resistance and equally their lifetime at high temperatures become to be a crucial factor during materials engineering. It was found that different surface preparations result in a different oxidation behavior of a wide range of alloys, e.g., Ni-base superalloys [10][11][12][13][14][15], iron [16], or Fe-base alloys [17][18][19][20][21]. Surface preparation significantly influences the oxidation behavior of these materials.…”

Effect of Surface Roughness on Early Stage Oxidation Behavior of Ni-Base Superalloy IN 625

“…The exact mechanism responsible for such change is not known so far. However, it was proposed by Nowak et al [8] that during a different kind of surface preparation different amount/kind of defects are introduced into the near-surface region, namely, by the treatment resulting in higher surface roughness, a higher amount of defects are introduced. These defects are claimed to be easy diffusion paths of the elements forming protective oxide scales, as in the present case chromium.…”

“…Sudbrack et al investigated LDS-1101_HF and CMSX-4 with different surface conditions [7]. They observed strong a correlation between the surface preparation and type of formed oxide scale, namely, on ground surface, thin 2 [8]. It was found that chromium rich oxide formed on polished surfaces, while alumina oxide formed on ground surfaces.…”

“…They observed strong a correlation between the surface preparation and type of formed oxide scale, namely, on ground surface, thin Al2O3 scale was observed, while on polished sample, a much thicker NiO outer scale with a subscale of Cr2O3-spinel-Al2O3 was found. Nowak et al investigated the role of surface finishing on oxidation kinetics of IN 713 C [8]. It was found that chromium rich oxide formed on polished surfaces, while alumina oxide formed on ground surfaces.…”

Design of newly developed burner rig operating with hydrogen rich fuel dedicated for materials testing

“…It was also claimed, that not only temperature, but also amount of water vapor in the atmosphere has detrimental effect on the rate of volatilization of chromium species (Holcomb, 2008). It was also found by Nowak et al (2016) that the water vapour suppresses nitrides formation below the external chromia scale on Ni-base superalloy Rene 80. The authors correlated the latter with preferential adsorption of water vapor molecules on the surface and suppressing the nitrogen transport through the oxide scale.…”