Microstructure, segregation and precipitate evolution in directionally solidified GH4742 superalloy

Yang, Shulei; Yang, Shufeng; Liu, Wei; Li, Jingshe; Gao, Jinguo; Wang, Yi

doi:10.1007/s12613-022-2549-6

Cited by 17 publications

(1 citation statement)

References 38 publications

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“…However, the more severe detriment of inclusions to superalloys lies in their potential for contamination, by impacting the elemental concentration and microstructure of the alloy [12,13]. Although changes in carbide morphology due to inclusions have been observed in superalloys [14,15], very little research has associated these changes with the mechanical properties of superalloys. For carbides in superalloys, some studies have suggested that carbides play a role in reinforcing superalloys [16].…”

Section: Introductionmentioning

confidence: 99%

Effect of Pre-Added HfO2 Inclusions on Carbide Morphology and Deformation Behavior in DZ125 Nickel-Based Superalloy

Feng,

Liu,

Wang

et al. 2024

Metals

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Inclusions are important phases affecting material properties in complicated ways. In this paper, a quantitative study of the addition of HfO2 inclusions to DZ125 nickel-based superalloys was performed. Experimental results showed that the introduction of HfO2 inclusions caused a loss of strength and ductility. The carbide morphology also changed significantly from skeletal-shaped to block-shaped, resulting in a remarkable discrepancy in the fracture behavior under quasi-in-situ tensile testing. The SEM dynamic observations showed that cracks were initiated from the skeletal carbides and almost failed to propagate into the matrix. In contrast, the damage behavior of block-shaped carbides also involved internal cracking but with a tendency to form interconnected microcracks during propagation. A crystal plasticity finite element model (CPFEM) method was further developed to study the stress/strain behavior during the deformation process, considering the crystal orientations and microstructure morphologies from the EBSD data. Those elastoplastic parameters were determined through nanoindentation experiments. Simulation results verified that blocky carbides produced a pronounced strain concentration at the interface of the carbides and matrix, thereby increasing the tendency of crack formation. This paper provides a fundamental understanding of the role of inclusions in material recycling applications.

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Section: Introductionmentioning

confidence: 99%

Effect of Pre-Added HfO2 Inclusions on Carbide Morphology and Deformation Behavior in DZ125 Nickel-Based Superalloy

Feng,

Liu,

Wang

et al. 2024

Metals

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Effect of Cerium on the Cleanliness and Properties of an Al‐Killed Low‐Sulfur Steel

Jia,

Liu,

Ren

et al. 2024

steel research int.

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Effects of the cerium content on inclusions, microstructure, and performance of an Al‐killed low‐sulfur steel are studied. As the cerium content in the steel increases from 0 to 190 ppm, the evolution path of the inclusion composition is Al2O3→CeAlO3→Ce2O2S + Ce2O3, and the inclusion size first decreases and then increases. When the cerium content is 76 ppm, the inclusion size reaches the minimum value. The addition of the ferrocerium is beneficial to the grain refinement of the Al‐killed low‐sulfur steel due to the low disregistry between inclusions and the steel matrix. The grain size of the steel decreases first, and it changes little after the cerium content reaching 76 ppm. The grain refinement is beneficial to increase steel properties. However, excessive inclusions in steel with a high cerium content reduce the tensile strength and the plasticity of the Al‐killed low‐sulfur steel.

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Remelting Model and Cracking Criterion for Vacuum Arc Remelting of Superalloys: Taking IN718 as an Example

Zhang,

Li,

Zhang

et al. 2024

Metall Mater Trans B

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Microstructure, segregation and precipitate evolution in directionally solidified GH4742 superalloy

Cited by 17 publications

References 38 publications

Effect of Pre-Added HfO2 Inclusions on Carbide Morphology and Deformation Behavior in DZ125 Nickel-Based Superalloy

Effect of Pre-Added HfO2 Inclusions on Carbide Morphology and Deformation Behavior in DZ125 Nickel-Based Superalloy

Effect of Cerium on the Cleanliness and Properties of an Al‐Killed Low‐Sulfur Steel

Remelting Model and Cracking Criterion for Vacuum Arc Remelting of Superalloys: Taking IN718 as an Example

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