Effect of Solidification Condition and Carbon Content on the Morphology of MC Carbide in Directionally Solidified Nickel-base Superalloys

Li, X.W.; Wang, L.; Dong, Jianshu; Lou, Langhong

doi:10.1016/j.jmst.2014.06.010

Cited by 44 publications

(16 citation statements)

References 18 publications

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“…1b). These results agree well with previous studies [13][14][15]26]. Further SEM observations on the deep-etched sample show that the script-like MC carbides actually adopt a dendritic structure (Fig.…”

Section: As-cast Microstructuresupporting

confidence: 93%

Effect of carbon content on the microstructure and creep properties of a 3rd generation single crystal nickel-base superalloy

Liu

Wang

et al. 2015

Materials Science and Engineering: A

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Section: As-cast Microstructuresupporting

confidence: 93%

Effect of carbon content on the microstructure and creep properties of a 3rd generation single crystal nickel-base superalloy

Liu

Wang

et al. 2015

Materials Science and Engineering: A

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“…Carbide morphology is governed by solidification parameters, carbide growth rate, carbide Fes enrichment and surrounding solid geometry, which determines carbide growth space [ 28 , 34 ]. It changes from acicular, nodular and blocky to Chinese script-type with increasing carbon addition and/or cooling rate [ 35 , 36 ]. When carbon content is low, as in CMSX-6 ( Figure 5 a), the carbide volume is small and the blocky shape provides the smallest surface area [ 28 ].…”

Section: Resultsmentioning

confidence: 99%

“…As explained by Li et al, higher carbon content leads to a greater supersaturation in the later stage of solidification, which induces the growth of well-developed secondary and tertiary dendrite arms [ 35 ]. Even though script-like carbides have a large surface area, some orientation relationships between two phases provide lower unit interface and strain energies.…”

Section: Resultsmentioning

confidence: 99%

Microstructural Investigations of Ni-Based Superalloys by Directional Solidification Quenching Technique

et al. 2020

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The improvement of the mechanical properties of Ni-based superalloys is achieved in most cases by modifying the chemical composition. Besides that, the processing can be modified to optimize the as-cast microstructure with regard to the mechanical properties. In this context, the present study highlights the solidification mechanism of several Ni-based superalloys by conducting experiments using a modified, laboratory-scale Bridgman-Stockbarger furnace. In that context, the single-crystal rods are partially melted, directionally solidified and quenched sequentially. Several characterization methods are applied to further analyze the influence of the alloying elements and the variation of the withdrawal rate on the as-cast microstructure. Four stages of solidification are distinguished whereby the morphology observed in the different stages mainly depends on the cooling rate and the local concentration of the carbide forming elements. The effect of carbide precipitation and the effect on the as-cast microstructure is investigated by employing energy dispersive X-ray spectrometry (EDX) and electron backscatter diffraction (EBSD) analysis techniques. A local polycrystalline structure is observed in the single-crystal system as consequence of the influence of the carbon content and the cooling rate. The present work aims to develop strategies to suppress the formation of the polycrystalline structure to maintain the single-crystal microstructure.

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“…In the other side, the morphology of γ′ precipitates turns different and the distribution of γ′ precipitates becomes more uniform with the decrease of cooling rate [10,11]. It also has been find that the MC carbide morphologies transformed [12].…”

Section: Introductionmentioning

confidence: 92%

Effects of Solidification Cooling Rate on the Microstructure of Nickel Based Superalloy GTD222

Gao¹,

Sui²,

Wang³

et al. 2019

Preprint

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The microstructure and solidification behavior of nickel based GTD222 superalloy at different cooling rates are studied. The solidification of the GTD222 superalloy proceeds as follows: L→L+γ, L→L+γ+MC, L→L+(γ/γ ′)-Eutectic and L→η phase. The temperature of liquidus of GTD222 superalloy is 1360 °C while the solidus is slightly lower at 1310 °C, which due to the alloying elements redistribution. It was found that the dendrite arm spacing of the alloy decreased with the increase of cooling rate (From 200 μm at 2.5 K/min to 100 μm at 20 K/min).

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Effect of Solidification Condition and Carbon Content on the Morphology of MC Carbide in Directionally Solidified Nickel-base Superalloys

Cited by 44 publications

References 18 publications

Effect of carbon content on the microstructure and creep properties of a 3rd generation single crystal nickel-base superalloy

Effect of carbon content on the microstructure and creep properties of a 3rd generation single crystal nickel-base superalloy

Microstructural Investigations of Ni-Based Superalloys by Directional Solidification Quenching Technique

Effects of Solidification Cooling Rate on the Microstructure of Nickel Based Superalloy GTD222

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