Effect of Grain Size on the Isothermal Oxidation of Fe-33Ni-19Cr Alloys at 700 °C

Parimin, Noraziana; Hamzah, Esah; Amrin, Astuty

doi:10.4028/www.scientific.net/amr.845.56

Cited by 4 publications

(4 citation statements)

References 10 publications

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“…In published literature, the parabolic rate constant for the oxidation of Hastelloy X in air was found to be 4.58×10 -8 g 2 /cm 4 /h at 1050°C and 1.20×10 -7 g 2 /cm 4 /h at 1100°C [80]. The published values for parabolic oxidation rate constant are higher than the experimental value obtained in this study, indicating that the AM samples may have an advantage in oxidation resistance due to finer grains and perhaps a better composition uniformity [81].…”

Section: Final Results Of Multi-layer Samplescontrasting

confidence: 65%

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Development and Characterization of Additive Manufacturing of Superalloy Hastealloy X Using a Cost Effective TIG Technique

Dinovitzer¹

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In this research, a wire and arc additive manufacturing process for superalloy Hastelloy X was developed and the resulting material was characterized. The effects of parameters in the TIG based process were investigated for single layer samples using the Taguchi method and an analysis of variance (ANOVA). Multi-layer deposition strategies were also tested and no significant difference was found between printing layers in the same direction or in alternating directions. Due to the excessive heat input of the preliminary trials, three distinct zones were identified and characterized by the size and distribution of the molybdenum carbides within the matrix grain formations. By refining deposition strategies and process parameters, the resulting multi-layer samples exhibited less variation in the size and shape of the molybdenum carbides. Hardness testing confirmed that there is little to no variation in hardness along or across the print direction, suggesting a constant thermal history throughout. Finally, the isothermal oxidation behavior of AM Hastelloy X was compared to the wrought alloy through testing in air at 1080°C. The parabolic oxidation rate constant, k1, of the AM samples was determined to be 4.54×10 -8 g 2 /cm 4 /h. Results suggest that the AM samples may have an advantage in oxidation resistance due to finer grains and perhaps a better composition uniformity. However, weight gains between the wrought and AM samples were quite similar suggesting an equivalent oxidation behavior.

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Section: Final Results Of Multi-layer Samplescontrasting

confidence: 65%

“…Over time, the oxidation rate slows significantly and appears to reach an asymptotic limit. The oxidation rate is expected to decrease over time as the adherent oxide impedes the diffusion of chromium ions [70], [81]. The wrought sample is shown to have formed a slightly thicker oxide layer than the AM samples.…”

Section: Final Results Of Multi-layer Samplesmentioning

confidence: 99%

Development and Characterization of Additive Manufacturing of Superalloy Hastealloy X Using a Cost Effective TIG Technique

Dinovitzer¹

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“…1 where x is weight change per surface area, t is time and m is constant. The m values of 1, 2 and 3 represent linear, parabolic and cubic oxidation, respectively [6][7][8]. From the analysis, the result shows that all samples were followed parabolic rate law.…”

Section: Resultsmentioning

confidence: 94%

Isothermal Oxidation Behavior of Fe-33Ni-18Cr Alloy in Different Heat Treatment Temperature

Zulnuraini

Parimin

2020

MSF

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This research study describes the influence of different heat treatment temperature on isothermal oxidation of Fe-33Ni-18Cr alloy. The Fe-33Ni-18Cr alloy was undergone heat treatment at three different temperatures, namely 1000 °C, 1100 °C and 1200 °C for 3h soaking time followed by water quench to vary the grain size of the alloy. This alloy was ground by using several grit of silicon carbide papers as well as weighed by using analytical balance and measured by using Vernier caliper before oxidation test. The heat-treated Fe-33Ni-18Cr alloy was isothermally oxidized at 800 °C for 150h. The characterization of oxidized samples was carried out using optical microscope, scanning electron microscope equipped with energy dispersive x-ray (SEM-EDX) and x-ray diffraction (XRD). The results showed that, increasing the heat treatment temperature was increased the average grain size. The kinetics of oxidation followed the parabolic rate law which represents diffusion-controlled oxide growth rate. Fine grain structure of 1000 °C sample shows minimum weight gain and lower oxidation rate compared to samples of 1100 °C and 1200 °C that indicated oxide spallation and porous structure. Besides, phase analysis showed that the oxidized sample formed several oxide phases.

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“…In addition, the reaction time of the initial oxidation stage of the Y-added alloys is greatly reduced compared with that of the Y-free alloys, which suggests that the addition of trace amounts of rare earth Y to the alloys can promote the rapid formation of dense oxide film on the surface of the alloys and improve the high-temperature oxidation resistance of the alloys. According to the reports in the literature [18,19], it is speculated that there are several reasons, (1) rare earth Y elements doped into the alloy in the form of precipitation phase in the alloy, due to the presence of Ni5Y phase, so that the alloy grain in the process of growing up to inhibit the growth of the alloy, the alloy grain size refinement, the alloy grain boundaries increased, and in the process of oxidation diffusion in alloys is generally dominant is the grain boundaries of the diffusion. Alloy grain boundaries increase, Cr element diffusion channels increase, making the alloy to form a dense protective oxide film Cr2O3 film time is greatly reduced, so the alloy in the oxidation of the early stage of rapid oxidation, and in the oxidation of the late oxidation rate tends to flatten.…”

Section: Oxidation Kineticsmentioning

confidence: 99%

Effect of Rare Earth Y Content on Microstructure and High Temperature Oxidation Properties of Fe-Ni Based Alloys

Fu,

Xi,

Chen

et al. 2023

Preprint

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The effects of rare earth Y content on the microstructure and high-temperature oxidation properties of 47Fe-36Ni-15Cr-1.5Mn alloy at 1000°C were investigated. The results show that 47Fe-36Ni-15Cr-1.5Mn alloy oxidizes at 1000°C under laboratory atmospheric pressure to form an oxide film layer dominated by Cr2O3 and (Fe, Ni, Mn) Cr2O4 spinel, and the oxidation curve of the alloy follows the parabolic law. After the addition of rare earth Y, rare earth phases precipitated along the grain boundaries in the alloy, and the more Y content, the more precipitated phases in the grain boundaries. The alloy with added rare earths was oxidized at a high temperature of 1000 °C for 2160 min, the oxidation law still followed the parabolic law, while the rare earth phase at the grain boundary reacted with the oxygen atoms infiltrated from the outside to generate a rare earth Y-rich oxide residing at the boundary between the grain boundary and the precipitated phase of the alloy. Add 0.5 wt.% rare earth Y 47Fe-36Ni-15Cr-1.5Mn-0.5Y alloy 1000 ° C high temperature oxidation of the formation of spinel oxide crystalline particles, dense and complete oxide film layer, the surface of the addition of a small amount of (0.5 wt.%) rare earth Y after the refinement of the oxide particles, and in the alloy grain boundaries in the form of oxides reside in the alloy to inhibit the cations in the matrix and the oxygen negative ions. and oxygen-negative ions in the alloy matrix, improving the antioxidant performance of the alloy. With the further increase of rare earth Y, during the oxidation of the alloy at high temperature, the precipitation phase at the grain boundary promotes the inward diffusion of oxygen, resulting in the deterioration of the antioxidant property of the alloy.

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Effect of Grain Size on the Isothermal Oxidation of Fe-33Ni-19Cr Alloys at 700 °C

Cited by 4 publications

References 10 publications

Development and Characterization of Additive Manufacturing of Superalloy Hastealloy X Using a Cost Effective TIG Technique

Development and Characterization of Additive Manufacturing of Superalloy Hastealloy X Using a Cost Effective TIG Technique

Isothermal Oxidation Behavior of Fe-33Ni-18Cr Alloy in Different Heat Treatment Temperature

Effect of Rare Earth Y Content on Microstructure and High Temperature Oxidation Properties of Fe-Ni Based Alloys

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