Influence of yttrium on purification and carbide precipitation of superalloy K4169

Cao, Shuting; Yang, Yuhui; Chen, Bin; Liu, Kui; Ma, Yingche; Ding, Leilei; Shi, Junjie

doi:10.1016/j.jmst.2021.01.049

Cited by 23 publications

(4 citation statements)

References 26 publications

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“…Through comprehensive investigations with SEM and TEM, the white precipitates appearing in the two alloys were identified as MC carbide and the σ phase. The formation of MC carbide could be attributed to the segregation of Ta, Ti, and C during the final solidification stage [ 26 ]. In Ni-based superalloys, Ta and Ti have stronger affinity with C than other elements do [ 27 , 28 ], which can prevent the combination of other elements with C, which would result in the formation of different kinds of carbides and the inhibition of the decomposition of MC carbides.…”

Section: Resultsmentioning

confidence: 99%

The Effects of Co on the Microstructure and Mechanical Properties of Ni-Based Superalloys Prepared via Selective Laser Melting

et al. 2023

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In this work, two Ni-based superalloys with 13 wt.% and 35 wt.% Co were prepared via selective laser melting (SLM), and the effects of Co on the microstructure and mechanical properties of the additively manufactured superalloys were investigated. As the Co fraction increased from 13 wt.% to 35 wt.%, the average grain size decreased from 25.69 μm to 17.57 μm, and the size of the nano-phases significantly increased from 80.54 nm to 230 nm. Moreover, the morphology of the γ′ phase changed from that of a cuboid to a sphere, since Co decreased the γ/γ′ lattice mismatch from 0.64% to 0.19%. At room temperature, the yield strength and ultimate tensile strength of the 13Co alloy reached 1379 MPa and 1487.34 MPa, and those of the 35Co alloy were reduced to 1231 MPa and 1350 MPa, while the elongation increased by 52%. The theoretical calculation indicated that the precipitation strengthening derived from the γ′ precipitates made the greatest contribution to the strength.

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Section: Resultsmentioning

confidence: 99%

The Effects of Co on the Microstructure and Mechanical Properties of Ni-Based Superalloys Prepared via Selective Laser Melting

et al. 2023

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“…It is obvious that the diffraction peak intensity of Cr 7 C 3 , Cr 23 C 6 , and Cr 2 Ni 3 of the four composite coatings after heat treatment at 500 • C for 1 h is higher than that of other heat-treatment temperatures (Figure 1A 2 ). This can be attributed to the fact that laser cladding is a rapid non-equilibrium solidification process [20,21]. During the laser-cladding process, parts of boron atoms do not have enough time to combine with carbon or nickel atoms or the solute in the unstable supersaturated solid solution (Ni,Fe) in the molten pool [22].…”

Section: Phase Structure Of Cladding Layermentioning

confidence: 99%

Simultaneously Improving Microstructures and Wear Properties of Ni60 Coating by Heat Treatment

Wang

Zhang

et al. 2022

Metals

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Ni60 self-lubricated anti-wear composite coatings were successfully precipitated on the 35CrMoV substrate by laser cladding technology. The effects of heat treatment on the macro-morphology, microstructure, precipitated phase, microhardness, and wear properties of the composite coatings with different heat treatment temperatures (25 °C, 500 °C, 600 °C, and 700 °C for 1 h) were investigated systemically. The macro-morphology, microstructure, precipitated phases, and elements distribution of laser cladding layers were detected by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS), respectively. The mechanical and tribological properties of the cladding layers were tested using a microscopic Vickers hardness tester and friction and wear tester, respectively. The results show that the main phases of Ni60 coatings are composed of γ-(Ni, Fe), Cr7C3, Cr23C6, CrB, CrFeB, and Cr2Ni3. In particular, the micro-structure and mechanical properties reach the best levels after heat treatment at 600 °C. The micro-hardness, average friction coefficient, and wear volume of the cladding layer are 771.4 to 915.8 HV1 and 0.434 and 2.9546 × 10−5 mm3, respectively. In conclusion, the micro-structure and mechanical properties of the cladding layer are greatly improved by the proper heat treatment temperature.

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“…Li et al [30] reported that using a Y 2 O 3 crucible for melting nickel-based superalloys could reduce the S content from 28 ppm to 6-7 ppm, and with the addition of 0.8 wt.% Y, the S content was further reduced to 2-3 ppm. Recent studies have also shown that using a Y 2 O 3 crucible for VIM of Y-containing nickel-based superalloys can reduce the S content and is beneficial for the purification process of the alloys [31,32]. However, there are few reports regarding the role of the Y in the desulfurization mechanism and its interfacial reaction with ceramics during the VIM process of the DD5 nickel-based superalloy.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Yttrium Content and Ceramic Crucible Materials on Desulfurization during Vacuum Induction Melting of DD5 Superalloys

Wang,

Cheng,

Zhang

et al. 2024

Metals

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In this study, the effect of adding different contents of yttrium (Y) during vacuum induction melting in Al2O3 and Y2O3 crucibles on the purification of DD5 alloys was investigated. The results show that the Y2O3 crucible exhibited great crucible stability and an excellent desulfurization effect when melting a Y-containing DD5 alloy. The S content of the alloy was reduced from 5.03 ppm to 1.36 ppm with the addition of 0.50 wt.% Y. Element Y combined with free S in the melt to form the YS phase, which was removed from the condensate shell and slag during the vacuum induction melting (VIM) process. Meanwhile, when the alloy was melted in the Y2O3 crucible with 0.50 wt.% Y addition, there was a reduction in S content from 2.77 ppm to 1.36 ppm compared to the Al2O3 crucible. Additionally, the loss of Y decreased from 0.12 wt.% to 0.05 wt.%.

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Influence of yttrium on purification and carbide precipitation of superalloy K4169

Cited by 23 publications

References 26 publications

The Effects of Co on the Microstructure and Mechanical Properties of Ni-Based Superalloys Prepared via Selective Laser Melting

The Effects of Co on the Microstructure and Mechanical Properties of Ni-Based Superalloys Prepared via Selective Laser Melting

Simultaneously Improving Microstructures and Wear Properties of Ni60 Coating by Heat Treatment

The Influence of Yttrium Content and Ceramic Crucible Materials on Desulfurization during Vacuum Induction Melting of DD5 Superalloys

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