Sub-solvus Cellular Recrystallization and P Phase Formation in a Single-Crystal Superalloy Containing Re

Zhuo, Longchao; Huang, Ming; Xiong, Jichun; Li, Jiarong; Zhu, Jing

doi:10.1007/s40195-014-0169-5

Cited by 9 publications

(6 citation statements)

References 29 publications

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“…The elongated c¢ phase in the intermediate layer is similar to the lamellar microstructure formed by cellular recrystallization, [26][27][28][29][30] or the columnar zone of elongated grains formed in solidified alloy ingots. [25] The samples in this study were subjected to multiple steps of melting, casting, and heat treatment during manufacturing.…”

Section: A Possibility Of Cellular Recrystallization or Formation Ofmentioning

confidence: 96%

“…[31,32] As a result, cellular recrystallization which is similar to the elongated c¢ and c phases has been observed in many specimens. [26][27][28][29][30][31][32] However, in order to initiate the recrystallization, a free surface as well as c¢-free zone must be available and this allows the recrystallization to occur on the surface and move into the bulk of the material. If these conditions do not exist, then a much higher amount of plastic deformation is required (e.g., more than about 10 pct).…”

Section: A Possibility Of Cellular Recrystallization or Formation Ofmentioning

confidence: 99%

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Formation of an Intermediate Layer Between Grains in Nickel-Based Superalloy Turbine Blades

Kim

Withey

2017

Metall Mater Trans A

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The boundary region formed on the surface of nickel-based single-crystal turbine blades was investigated by high-resolution microscopy observation. There was a distinguishable intermediate layer with the size of about 2 to 5 lm between the matrix and surface defect grains such as stray grains, multiple grains, freckle grains, and even low-angle grain boundaries which were formed during the solidification of turbine blades. The intermediate layer was composed of many elongated c¢ as well as c phases. In addition, only one side of the intermediate layer was coherent to the matrix grain or defect grain due to good orientation match. At the coherent interface, the c¢ (as well as c) phase started to extend from the parent grain and coincidently, rhenium-rich particles were detected. Furthermore, the particles existed within both elongated gamma prime and gamma phases, and even at their boundary. Based on experimental observations, the formation mechanism of this intermediate layer was discussed.

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Section: A Possibility Of Cellular Recrystallization or Formation Ofmentioning

confidence: 96%

Section: A Possibility Of Cellular Recrystallization or Formation Ofmentioning

confidence: 99%

Formation of an Intermediate Layer Between Grains in Nickel-Based Superalloy Turbine Blades

Kim

Withey

2017

Metall Mater Trans A

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“…Zhuo et al . have reported that the P phase in an experimental Re‐containing SC superalloy contains mostly W and Re (Zhuo et al ., ). The precipitates of the μ phase observed in a rhodium‐modified aluminide coating deposited on the CMSX‐4 superalloy were rich in W, Co and Cr (Zagula‐Yavorska et al ., ).…”

Section: Resultsmentioning

confidence: 97%

“…Rae & Reed have observed that increases in the Mo and Cr content lead to the stabilization of the P phase (Rae & Reed, 2001). Zhuo et al have reported that the P phase in an experimental Re-containing SC superalloy contains mostly W and Re (Zhuo et al, 2015). The precipitates of the μ phase observed in a rhodium-modified aluminide coating deposited on the CMSX-4 superalloy were rich in W, Co and Cr (Zagula-Yavorska et al, 2016).…”

Section: Chemical Elements Partitioning Between the μ And P Phasesmentioning

confidence: 99%

Characterization of the μ and P phase precipitates in the CMSX‐4 single crystal superalloy

Dubiel

Indyka

Moskalewicz

et al. 2017

Journal of Microscopy

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A combination of scanning electron microscopy (SEM), transmission electron microscopy (TEM) and scanning-transmission electron microscopy (STEM) using high-angle annular-dark-field (HAADF) imaging, focussed ion beam- scanning electron microscopy (FIB-SEM) tomography, selected area electron diffraction with beam precession (PED), as well as spatially resolved energy-dispersive X-ray spectroscopy (EDS) and electron energy loss spectroscopy (EELS), was used to investigate topologically close-packed (TCP) phases, occurring in the CMSX-4 superalloy subjected to high temperature annealing and creep deformation. Structural and chemical analyses were performed to identify the TCP phases and provide information concerning the compositional partitioning of elements between them. The results of SEM and FIB-SEM tomography revealed the presence of merged TCP particles, which were identified by TEM and PED analysis as coprecipitates of the μ and P phases. Inside the TCP particles that were several micrometres in size, platelets of alternating μ and P phases of nanometric width were found. The combination of STEM-HAADF imaging with spatially resolved EDS and EELS microanalysis allowed determination of the significant partitioning of the constituent elements between the μ and P phases.

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“…No evident changes were observed concerning the precipitation temperature of the μ phase between Alloy 2Re and 3Re, but the P phase would begin to appear at about 1150 °C in the Alloy 3Re. Nevertheless, in the work of Zhou et al about DD6 single crystal superalloy, the P phase would precipitate after annealing at 1100 °C [25]. The precipitation behavior of P phase has the necessity to be figured out in the future works.…”

Section: Thermodynamic Calculationmentioning

confidence: 97%

Evolution of TCP Phase During Long Term Thermal Exposure in Several Re-Containing Single Crystal Superalloys

Tan

Yang

Wang

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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The application and component designs of single crystal superalloys are restricted by the precipitation of topologically closed packed (TCP) phases, which can deteriorate the microstructural stability of the alloys severely. Limited researches concerning the type and morphology evolution of TCP phases under elevated temperature conditions have been reported previously. In the present work, three Re-containing single crystal alloys were designed to investigate TCP phase evolution via long term isothermal exposure tests at 1120 °C while the effects of Re on the microstructural characteristic and elements segregation were also clarified. The results showed that the addition of Re increased the instability of the alloys and the volume fraction of the TCP phases exceeded 5 vol% when the Re content reached 3 wt%. The increasing Re content had also raised the precipitation temperature of TCP phases but it did not change the type of them after long term aging; all the TCP particles were identified as μ phase in this study. Moreover, the elements segregation became considerably serious as Re addition increased constantly, which brought about various morphologies of the μ phase in the experimental alloys. In particular, the rod-like and needle-like μ phases demonstrated the typical orientation within γ matrix while the blocky μ phase was dispersedly distributed in the space. No specific orientation relationship could be observed in the μ phase when the addition of Re exceeded certain threshold value.

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Sub-solvus Cellular Recrystallization and P Phase Formation in a Single-Crystal Superalloy Containing Re

Cited by 9 publications

References 29 publications

Formation of an Intermediate Layer Between Grains in Nickel-Based Superalloy Turbine Blades

Formation of an Intermediate Layer Between Grains in Nickel-Based Superalloy Turbine Blades

Characterization of the μ and P phase precipitates in the CMSX‐4 single crystal superalloy

Evolution of TCP Phase During Long Term Thermal Exposure in Several Re-Containing Single Crystal Superalloys

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