The effect of phosphorus on the formation of grain boundary laves phase in high-refractory content Ni-based superalloys

Antonov, Stoichko; Chen, Wei; Lu, Song; Isheim, Dieter; Seidman, David N.; Feng, Qiang; Sun, Eugene; Tin, Sammy

doi:10.1016/j.scriptamat.2018.10.015

Cited by 26 publications

(5 citation statements)

References 21 publications

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“…During the solidification process, microsegregation of Nb and Mo into the interdendritic region resulted in the formation of Laves phases [21,22]. The brittle nature of the Laves phase is detrimental to the mechanical properties [23].…”

Section: A Microstructure and Phase Analysismentioning

confidence: 99%

Inconel 625 Coatings on AISI 304 Steel using Laser Cladding: Microstructure and Hardness

Vijeesh,

Ramesh,

Anoop

2023

Eng. Technol. Appl. Sci. Res.

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Nickel-base super alloys such as Inconel 625 are preferred in high-temperature and corrosive environments. Since Inconel 625 is expensive and often difficult to machine, it is advantageous to deposit a protective coating of this alloy on a less costly and easily machinable substrate material such as stainless steel. In the present work, coatings were produced on AISI 304 steel substrate by depositing Inconel 625 powder using the laser cladding technique. As-received powder particles of Inconel 625 alloy were characterized using X-Ray Diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM). After laser cladding, it becomes important to carry out the microstructural analysis of the cross-sectional areas of the coating and the substrate/coating interface region, for further understanding of the structure-property correlations. In this study, the microstructural features of the coatings and substrate/coating interface were examined using an FESEM equipped with X-ray elemental analysis. The phase analysis of the coating was carried out using XRD. In the coating region, the growth of planar, cellular, columnar dendritic, and equiaxed grains was noticed. It was observed that small amounts of Laves phase were precipitated. Furthermore, the laser-clad Inconel 625 coating showed superior microhardness over the stainless steel substrate.

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Section: A Microstructure and Phase Analysismentioning

confidence: 99%

Inconel 625 Coatings on AISI 304 Steel using Laser Cladding: Microstructure and Hardness

Vijeesh,

Ramesh,

Anoop

2023

Eng. Technol. Appl. Sci. Res.

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“…This tendency is different from that in quaternary alloys, in which Mo and Nb replacement for W decreased and increased c¢ solvus temperature to different extents. [30][31][32] Figure 1 shows the predicted isothermal section of Co-9Al-30Ni-12Cr-W as a function of Mo and Nb contents at 750°C. Although 4W1Mo with 1 at.…”

Section: A Predicted Thermodynamic Propertiesmentioning

confidence: 99%

“…Compared to 5W alloy, the morphology of the c¢ precipiates becames more spherical with the increasing Mo replacement, probably attributed to the decrease of the c/c¢ two-phase misfit as reported in Mo-containing Co-base alloys. [30][31][32] However, replacing W with Nb leading to less spherical c¢ precipiates in 4W1Nb ( Figure 4) and further cuboidal precipiates in 1W4Nb. The volume fractions of c¢ precipitates in the experimental alloys are given in Figure 5.…”

Section: Microstructure Evolution At 750°cmentioning

confidence: 99%

Microstructure and Properties Evolution of Co-Al-W-Ni-Cr Superalloys by Molybdenum and Niobium Substitutions for Tungsten

Zhang

Xue

et al. 2019

Metall Mater Trans A

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The microstructure and mechanical properties of Co-Al-W to Co-Al-Mo/Nb alloy systems have been investigated in an attempt to identify the influence of replacement for W in multicomponent Co-based alloys with 30 at. pct Ni and 12 at. pct Cr. Either Mo or Nb additions at the expense of W reduce alloy density to a similar extent. Increasing Mo substitution significantly decreases the c¢ volume fraction and results in spherical c¢ morphology at 750°C, whereas Nb substitution shows opposite effects on the c¢ volume fraction and morphology. Accordingly, the Mo and Nb additions raise and decrease the microhardness and high-temperature compression strength, respectively. The results can provide reference for the development of Co-based superalloys with low density and high strength.

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“…There have been several studies on the mechanisms behind the beneficial effects of minor P addition. These suggested that P tended to strongly segregate to grain boundaries, which enhances grain boundary strength [1,4,8,13], controls grain boundary precipitation [2][3][4][5][6][7]14,15], and inhibits intergranular oxidation [3].…”

Section: Introductionmentioning

confidence: 99%

Influence of Phosphorus Addition on the Stress Rupture Properties of Direct Aged IN706 Superalloy

Zhang

Xue

et al. 2020

Crystals

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This study investigated the influence of phosphorus (P) addition on the stress rupture properties of direct aged IN706 superalloy. The results showed that P slightly improved the stress rupture life of the superalloy when added in the range between 0.002% and 0.008%; however, it significantly reduced the stress rupture life when added in the range between 0.013% and 0.017%. Microstructure characterization indicated that the precipitation of γ′, γ″, and η phases was not significantly affected by the addition of P. Phosphides precipitated in the alloy containing 0.017% P after aging at 980 °C for 10 min. Compared to a similar study previously made on IN706 superalloy, it was found that the optimum P concentration in the as-solutioned state for improving the stress rupture properties was not definite. Furthermore, the relationship between the amount of P segregated at the grain boundary and the role of P on the stress rupture properties was discussed.

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The effect of phosphorus on the formation of grain boundary laves phase in high-refractory content Ni-based superalloys

Cited by 26 publications

References 21 publications

Inconel 625 Coatings on AISI 304 Steel using Laser Cladding: Microstructure and Hardness

Inconel 625 Coatings on AISI 304 Steel using Laser Cladding: Microstructure and Hardness

Microstructure and Properties Evolution of Co-Al-W-Ni-Cr Superalloys by Molybdenum and Niobium Substitutions for Tungsten

Influence of Phosphorus Addition on the Stress Rupture Properties of Direct Aged IN706 Superalloy

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