2019
DOI: 10.1016/j.actamat.2018.12.039
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Influence of composition and precipitation evolution on damage at grain boundaries in a crept polycrystalline Ni-based superalloy

Abstract: The microstructural and compositional evolution of intergranular carbides and borides prior to and after creep deformation at 850 °C in a polycrystalline nickel-based superalloy was studied. Primary MC carbides, enveloped within intergranular γ' layers, decomposed resulting in the formation of layers of the undesirable  phase. These layers have a composition corresponding to Ni3Ta as measured by atom probe tomography and their structure is consistent with the D024 hexagonal structure as revealed by transmissi… Show more

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Cited by 73 publications
(33 citation statements)
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“…Similarly, the M 5 B 3 and M 3 B 2 borides have been observed to exhibit greater affinity for Cr than what we see for M 2 B. [1,22,33] This likely has significant implications on oxide scale formation and possible c¢ depletion during high-temperature (atmosphere exposed) deformation. Mo and W are not known to be beneficial to stable oxide formation, so precipitates rich in these elements may not be optimal for significant grain boundary coverage.…”
Section: Discussionsupporting
confidence: 52%
See 1 more Smart Citation
“…Similarly, the M 5 B 3 and M 3 B 2 borides have been observed to exhibit greater affinity for Cr than what we see for M 2 B. [1,22,33] This likely has significant implications on oxide scale formation and possible c¢ depletion during high-temperature (atmosphere exposed) deformation. Mo and W are not known to be beneficial to stable oxide formation, so precipitates rich in these elements may not be optimal for significant grain boundary coverage.…”
Section: Discussionsupporting
confidence: 52%
“…There is significant evidence that these precipitates' exact character has a significant effect on mechanical and environmental stability, especially in high-temperature applications, despite their small volume fraction. [1][2][3][4] A secondary effect of grain boundary precipitate interactions is the ability to facilitate grain boundary serration mechanisms, also an essential consideration in modern superalloy grain boundary engineering. [5,6] This work develops the V208 series first presented by Knop et al [7][8][9] A set of Co/Ni-base superalloys based on V208C are presented, with Mo additions (for solid solution strength) and varied C, B, Zr, and Ti content for grain boundary chemistry adjustment.…”
Section: Introductionmentioning
confidence: 99%
“…Mo, Cr and W segregate to the M6C phase. Similar observations of Ta and Zr enrichment in superalloy MC carbides has been reported by atom probe tomography studies [7,10]. We believe that the technique presented in this work provides a means of confirming trends in precipitate composition between alloys, as well as where elements tend to segregate upon nominal enrichment of the bulk composition.…”
Section: Chemical Analysis Of Labelled Phasessupporting
confidence: 85%
“…The diffraction pattern analysis proves that both samples contain the g phase (the matrix) together with both d and h high-temperature phases, as well as some traces of NbC. In addition, the VDM-780-b sample also shows the g' hardening phase [6,12,26]. The unambiguous presence of both high-temperature phases is confirmed by the presence of the Table S1).…”
Section: Resultsmentioning
confidence: 69%