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

Nowak, W.

doi:10.3390/asi1030032

Cited by 13 publications

(5 citation statements)

References 20 publications

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“…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.…”

Section: Introductionmentioning

confidence: 99%

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

2019

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Fe-based alloys are commonly used in almost every sector of human life. For different reasons, the surfaces of the real parts are prepared using different methods, e.g., mirror-like polishing, grit-blasting, etc. The purpose of the present work is to answer the question how the surface preparation influences the oxidation behavior of Fe-based alloys. To answer this question, a high-purity model alloy, Fe-5 wt%Al, was isothermally oxidized in a thermogravimetrical furnace. The post-exposure analysis included SEM/EDS (WDS) and XRD. The surface roughness was determined by a contact and laser profilometer. The obtained results demonstrate that the mechanical surface preparation influences oxidation kinetics as well as the microstructure of the oxide scale formed on the alloy at both studied temperatures. Namely, polishing and grinding caused local formation of Fe-rich nodules and sub-layer of protective Al 2 O 3. In contrast, gritblasting leads to the formation of a thick outer Fe-oxide and internal aluminum nitridation. A significant increase in the oxidation rate of the material after gritblasting was attributed to grain refinement in the near-surface region, resulting in an increase in easy diffusion paths, namely grain boundaries.

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Section: Introductionmentioning

confidence: 99%

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

2019

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“…It is of interest that the relative amount of oxygen depends on the surface roughness rather than the research atmosphere (air or Ar). This can be explained by the fact that the geometric area of a rough surface is larger than that of a smooth surface and therefore an oxidation results in a larger scale [23]. Also, relatively high oxygen content on the surface may be caused by oxygen contamination from air.…”

Section: Resultsmentioning

confidence: 99%

Laser-Ablated Silicon in the Frequency Range From 0.1 to 4.7 THz

Indrišiūnas

Svirplys

Richter

et al. 2019

IEEE Trans. THz Sci. Technol.

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The optical performance of high-resistivity silicon with a laser-ablated surface was studied in the transmission mode in the frequency range of 0.1-4.7 THz. A reciprocal relationship between the transmission brightness and the surface roughness was observed at discrete THz frequencies. The measured dispersion was reproduced by the THz wave scattering theory using an effective refractive index model. No significant differences between the samples processed either with ps-or ns-duration laser pulses in ambient air or in argon enriched atmosphere were found in the THz regime. It was demonstrated that the majority of optical losses of the silicon with the laser modified surface were due to the scattering of THz waves and not due to the absorption in silicon-compounds formed during the laser ablation.

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“…The samples synthesized at a higher temperature and a shorter time appear to increase start-up oxidation temperatures. However, surface roughness was shown to play a role in the oxidation behavior of several materials [51][52][53][54][55][56]. Platt et al [54] reported that there is a clear trend towards rougher surfaces generating thicker oxides.…”

Section: Siliconizing Stepmentioning

confidence: 99%

Effect of the Deposition Time and Heating Temperature on the Structure of Chromium Silicides Synthesized by Pack Cementation Process

Tarani

Stathokostopoulos

Tsipas

et al. 2021

CMD

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Transition metal silicides have attracted great interest for their potential use in optoelectronic devices, photovoltaic cells, and thermoelectric conversion elements because of their high melting point, high oxidation resistance, and satisfactory thermoelectric properties. This study focuses on the effect of the deposition time and the heating temperature on the morphology and structure of the chromium silicides synthesized by the pack cementation method. A series of experiments were carried out at various temperatures (1000–1150 °C) with different deposition times (15–120 min). The morphology and the chemical composition of the samples were determined using SEM with an EDS analyzer. The structure determination and phase identification were performed by XRD analysis. The examination of the as-formed materials was completed by performing thermal stability tests. The most suitable conditions for producing CrSi2 sample with satisfactory properties and simultaneously minimizing the cost and production time are listed. It was found that the sample synthesized at 1000 °C for 15 min during the chromizing step, in combination with the siliconizing step at 1000 °C for 60 min, presents the best thermal stability and these selected temperatures offer appropriate, economical, and repeatable results.

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

Cited by 13 publications

References 20 publications

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

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

Laser-Ablated Silicon in the Frequency Range From 0.1 to 4.7 THz

Effect of the Deposition Time and Heating Temperature on the Structure of Chromium Silicides Synthesized by Pack Cementation Process

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