Influence of Alloying Compositions on the Properties of Nickel-Based Superalloys: A Review

Ganji, Dileep Kumar; Rajyalakshmi, G.

doi:10.1007/978-981-15-1071-7_44

Cited by 28 publications

(6 citation statements)

References 53 publications

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“…A slight variation in the composition of the major alloying elements is noted, but is within the allowed limits as per ASTM B637 standard [39]. The elements Co and Cu are not detected in the AM samples; these elements are added to impart solid solution strengthening in Ni-based superalloys, and are not expected to majorly influence the precipitation of phases in this study [41]. Figure 4 shows the microstructure of the conventional Inconel 718 sample after heat treatment with equiaxed grains and annealing twins.…”

Section: Microstructural Characterisationmentioning

confidence: 59%

Hydrogen Embrittlement of Inconel 718 Manufactured by Laser Powder Bed Fusion Using Sustainable Feedstock: Effect of Heat Treatment and Microstructural Anisotropy

Mohandas

Giorgini

Vanazzi

et al. 2023

Metals

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This study investigated the in-situ gaseous (under 150 bar) hydrogen embrittlement behaviour of additively manufactured (AM) Inconel 718 produced from sustainable feedstock. Here, sustainable feedstock refers to the Inconel 718 powder produced by vacuum induction melting inert gas atomisation of failed printed parts or waste from CNC machining. All Inconel 718 samples, namely AM-as-processed, AM-heat-treated and conventional samples showed severe hydrogen embrittlement. Additionally, it was found that despite its higher yield strength (1462 ± 8 MPa) and the presence of δ phase, heat-treated AM Inconel 718 demonstrates 64% lower degree of hydrogen embrittlement compared to the wrought counterpart (Y.S. 1069 ± 4 MPa). This was linked to the anisotropic microstructure induced by the AM process, which was found to cause directional embrittlement unlike the wrought samples showing isotropic embrittlement. In conclusion, this study shows that AM Inconel 718 produced from recycled feedstock shows better hydrogen embrittlement resistance compared to the wrought sample. Furthermore, the unique anisotropic properties, seen in this study for Inconel 718 manufactured by laser powder bed fusion, could be considered further in component design to help minimise the degree of hydrogen embrittlement.

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Section: Microstructural Characterisationmentioning

confidence: 59%

Hydrogen Embrittlement of Inconel 718 Manufactured by Laser Powder Bed Fusion Using Sustainable Feedstock: Effect of Heat Treatment and Microstructural Anisotropy

Mohandas

Giorgini

Vanazzi

et al. 2023

Metals

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“…Fe-Ni based alloys have many excellent properties, corrosion resistance, resistance to high temperature oxidation and excellent high temperature mechanical properties, etc. They are one of the key candidate materials for the sodium-cooled fast reactor dynamic conduits in the fourth generation of nuclear reactors, and the higher the temperature and the harsher the service environment, the higher the antioxidant properties of the alloys are required [6,7]. The high-temperature oxidation behavior of the alloy is very complex, which is typically characterized by changes in oxidation kinetics and oxide film composition.…”

Section: Introductionmentioning

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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“…The adjustment of alloy composition can improve the alloy properties to some extent. For example, adding Cr, Al, and Y can confer oxidation resistance; B, Zr, C, and H can refine grain boundaries; B and Ta can improve creep properties; and Co, Cr, and Si can provide anti-sulfuration properties [ 4 ]. The high-temperature oxidation resistance of superalloys is positively correlated with the content of the corresponding alloying elements, but simply increasing the content of antioxidant elements can significantly reduce the mechanical properties of the alloy.…”

Section: Introductionmentioning

confidence: 99%

Effect of Slurry Thickness on the Quality of Aluminized Coatings

Wang

Ding

et al. 2022

Materials

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Diffusion aluminum coating is crucial to protect aero-engine turbine blades from high-temperature oxidation. Slurry aluminizing, as a commonly-used coating preparation technology, has variations in the process parameters that directly affect the quality of the coating. Therefore, this paper investigates the effect of slurry thickness on coating quality. Different forms of aluminized coatings were obtained by coating nine DZ22B nickel-based superalloy plates of the same size with different slurry thicknesses while keeping other parameters constant. These aluminized coatings were characterized using a scanning electron microscope (SEM) with an energy dispersive spectrometer (EDS), an X-ray diffractometer (XRD), and a surface gauge. The results show that the AlNi phase dominates the matrix of the aluminized coating, and the outer layer of the coating has white dotted precipitates of Cr. As the slurry thickness increases, the coating thickness increases, and the proportion of the outer layer in the overall coating increases. In contrast, the thickness of the interdiffusion layer does not change significantly. The thicker the slurry, the higher the Al content of the coating surface. A medium-thickness slurry can form a smooth aluminizing coating with a roughness Ra < 4.5 μm surface. The combined results show that a medium-thick slurry can produce a high-quality coating.

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Influence of Alloying Compositions on the Properties of Nickel-Based Superalloys: A Review

Cited by 28 publications

References 53 publications

Hydrogen Embrittlement of Inconel 718 Manufactured by Laser Powder Bed Fusion Using Sustainable Feedstock: Effect of Heat Treatment and Microstructural Anisotropy

Hydrogen Embrittlement of Inconel 718 Manufactured by Laser Powder Bed Fusion Using Sustainable Feedstock: Effect of Heat Treatment and Microstructural Anisotropy

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

Effect of Slurry Thickness on the Quality of Aluminized Coatings

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