Quantitative analysis of carbides and the sigma phase in thermally exposed GTD-111

Lee, Han-sang; Kim, Doo-Soo; Yoo, Keun Bong; Song, Kyu-so

doi:10.1007/s12540-012-2012-8

Cited by 11 publications

(11 citation statements)

References 19 publications

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“…This C was picked up as a contaminant during the arc-melting process. The competition between the σ phase and M 23 C 6 for elements is well-established in the literature [23,24]. Therefore, the observed trend for a higher quantity of M 23 C 6 precipitation at lower Mo contents can be explained by the lower quantity of σ precipitation in these alloys.…”

Section: Precipitation Behaviour Following Thermal Exposuresupporting

confidence: 55%

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Comparison of experimental and predicted TCP solvus temperatures in Ni-base superalloys

Wilson

Hardy

Stone

2019

Journal of Alloys and Compounds

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Differential Scanning Calorimetry has been used for the first time to quantify sigma solvus temperatures in a series of model nickel-based alloys. These data were compared with thermodynamic predictions of the sigma solvus temperatures made using Thermocalc software to assess the fidelity of the available databases. It was found that the expected trend of increasing solvus temperature with increasing Mo content is correctly predicted, but that the solvus temperatures themselves are significantly under-predicted. Due to the important role that topologically close-packed phases play in limiting the service life of nickel-based superalloys, this has important implications for the use of sigma solvus temperature predictions in the alloy design process.

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Section: Precipitation Behaviour Following Thermal Exposuresupporting

confidence: 55%

“…Comparison of experimental and predicted data for (a) γ′ and (b) σ solvus temperatures from the current experiment, and (c) quantities of TCP phases with experimental data taken from the literature[24,[27][28][29]. Labels on data points indicate the duration of the thermal exposure in hours.…”

mentioning

confidence: 99%

Comparison of experimental and predicted TCP solvus temperatures in Ni-base superalloys

Wilson

Hardy

Stone

2019

Journal of Alloys and Compounds

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“…As a result, it has been shown that the presence of σ reduces the formation rate of M 23 C 6 and vice versa. 48 This was shown in the work of Lee et al, 48 Fig. 4, where the wt-% of M 23 C 6 is lower when σ is formed.…”

Section: Effect Of Individual Elementsmentioning

confidence: 75%

Formation and effect of topologically close-packed phases in nickel-base superalloys

Wilson

2017

Materials Science and Technology

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The formation of topologically close-packed (TCP) phases in nickel-base superalloys is an issue of increasing importance as alloys are designed with higher refractory element contents to meet the requirements of next generation turbine engines. This review considers the factors that affect an alloy's susceptibility to TCP formation. In particular, the debate surrounding the effect of certain individual elements, such as Co and Re, in promoting or suppressing TCP formation is examined alongside the various mechanisms that have been proposed to account for this behaviour. In addition, the detrimental effects of these phases on the alloy's mechanical properties are discussed, including crack initiation at precipitates, depletion of solid solution strengthening refractory elements and the effect on γ/γʹ rafting behaviour.

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“…In fact, platelet η and nodular σ phases have been observed in cast Ni-Cr-Co superalloys like IN738 [35][36][37]. The σ phase consists of high Co and Cr concentrations [41], besides, the plate-like σ enriched in Co and Cr nucleates around the grain boundaries of GTD-111 superalloy [42]. Platelet and blocky η phases are also formed in IN738 [36] and in the interdendritic region of IN939 (Ni-Cr-Co) superalloy [43].…”

Section: Discussionmentioning

confidence: 99%

Liquation Cracking in the Heat-Affected Zone of IN738 Superalloy Weld

Chen

Shiue

et al. 2018

Metals

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Abstract:The main scope of this study investigated the occurrence of liquation cracking in the heat-affected zone (HAZ) of IN738 superalloy weld, IN738 is widely used in gas turbine blades in land-based power plants. Microstructural examinations showed considerable amounts of γ' uniformly precipitated in the γ matrix. Electron probe microanalysis (EPMA) maps showed the γ-γ' colonies were rich in Al and Ti, but lean in other alloy elements. Moreover, the metal carbides (MC), fine borides (M 3 B 2 and M 5 B 3 ), η-Ni 3 Ti, σ (Cr-Co) and lamellar Ni 7 Zr 2 intermetallic compounds could be found at the interdendritic boundaries. The fracture morphologies and the corresponding EPMA maps confirmed that the liquation cracking in the HAZ of the IN738 superalloy weld resulted from the presence of complex microconstituents at the interdendritic boundaries.

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Quantitative analysis of carbides and the sigma phase in thermally exposed GTD-111

Cited by 11 publications

References 19 publications

Comparison of experimental and predicted TCP solvus temperatures in Ni-base superalloys

Comparison of experimental and predicted TCP solvus temperatures in Ni-base superalloys

Formation and effect of topologically close-packed phases in nickel-base superalloys

Liquation Cracking in the Heat-Affected Zone of IN738 Superalloy Weld

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