The effect of silicon on precipitation and decomposition behaviors of M6C carbide in a Ni–Mo–Cr superalloy

Xu, Ziqian; Li, Jiang; Dong, Jianshu; Li, Zhijun; Zhou, Xingtai

doi:10.1016/j.jallcom.2014.09.112

Cited by 98 publications

(26 citation statements)

References 12 publications

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“…It seems that due to the high carbon content, the aggregation of the carbide phases of molybdenum, silicon and nickel occurs, which occurs more on the surface of the alloy than in the grains. The similar corrosion behavior of the Hastelloy-N alloy with accumulation of carbides on reaction surface was also found for a molten LiF-BeF 2 salt mixture exposed in graphite crucible [18][19][20][21][22][23][24][25].…”

Section: Selective Chromium Corrosionsupporting

confidence: 73%

Effect of the [U(IV)]/[U(III)] ratio on selective chromium corrosion and tellurium intergranular cracking of Hastelloy N alloy in the fuel LiF-BeF₂-UF₄ salt

Surenkov

Ignatiev

Presnyakov

et al. 2020

EPJ Nuclear Sci. Technol.

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Effect of the [U(IV)/U(III)] ratio of fuel salt on selective chromium corrosion and tellurium intergranular cracking (IGC) of Hastelloy N alloy in the LiF-BeF2-UF4 salt mixture was investigated. The chromium corrosion of Hastelloy N alloy is caused by the oxidation of chromium on the alloy surface by reaction with UF4. The tellurium IGC of Hastelloy N alloy is caused by the diffusion of tellurium along the grain boundaries with the formation of unstable tellurides with based metals and alloying additives. Results indicate that the selective chromium corrosion and the tellurium IGC of the Hastelloy N alloy in fuel salt can be controlled by the [U(IV)]/[U(III)] ratio. The tellurium IGC of Hastelloy N alloy exposed in fuel LiF-BeF2-UF4 salt can be avoided. For temperatures up to 760 °C the selective chromium corrosion can be minimized to the acceptable level when the [U(IV)]/[U(III)] ratio of fuel salt is bellow 30–40.

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Section: Selective Chromium Corrosionsupporting

confidence: 73%

Effect of the [U(IV)]/[U(III)] ratio on selective chromium corrosion and tellurium intergranular cracking of Hastelloy N alloy in the fuel LiF-BeF₂-UF₄ salt

Surenkov

Ignatiev

Presnyakov

et al. 2020

EPJ Nuclear Sci. Technol.

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“…The NbC carbide size distribution found on primary solidification is usually that to be found in the final alloy product. [35,36] The first Time-Temperature-Transformation (TTT) diagram for wrought alloy 718 was presented by Eiselstein. [37] He identified the M 6 C carbides in X-ray extraction residues.…”

Section: Introductionmentioning

confidence: 99%

Identification of Mo-Rich M23C6 Carbides in Alloy 718

Aghajani¹,

Tewes²,

Parsa

et al. 2016

Metall Mater Trans A

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In the present study, we systematically identify and characterize a (Nb, Mo)-rich M 23 C 6 type of M 23 C 6 carbide with a lattice parameter of 1.094 nm in alloy 718 for the first time using a combination of selected area electron diffraction pattern and powder X-ray diffraction analysis. The time-temperature-precipitation diagrams of the precipitates in both annealed and strained conditions are obtained by particle analysis using an automated scanning electron microscopy method. (Nb, Mo)-rich M 23 C 6 carbides first precipitate after 24 hours at 1223 K (950°C) annealing, while they form after 10 minutes at 1273 K (1000°C) in the strained condition. This correlates with the excess dislocations produce during deformation.

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“…The alloys frequently contain carbides of the form M 6 C (η) and M 23 C 6 [7,9,10]. The Si content in these alloys not only improves oxidation resistance, but also stabilizes the complex silicide/carbide phases of the form Ni 2 (Mo,Cr) 4 (Si,C) and Ni 3 (Mo,Cr) 3 (Si,C) [7,11]. These phases appear in the form of equiaxed particles (with some faceting visible) in stringers parallel to the rolling or extrusion direction, and can be as large as 2-5 μm.…”

Section: Introductionmentioning

confidence: 99%

Characterization of complex carbide–silicide precipitates in a Ni–Cr–Mo–Fe–Si alloy modified by welding

Bhattacharyya

Davis

Drew

et al. 2015

Materials Characterization

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The effect of silicon on precipitation and decomposition behaviors of M6C carbide in a Ni–Mo–Cr superalloy

Cited by 98 publications

References 12 publications

Effect of the [U(IV)]/[U(III)] ratio on selective chromium corrosion and tellurium intergranular cracking of Hastelloy N alloy in the fuel LiF-BeF₂-UF₄ salt

Effect of the [U(IV)]/[U(III)] ratio on selective chromium corrosion and tellurium intergranular cracking of Hastelloy N alloy in the fuel LiF-BeF₂-UF₄ salt

Identification of Mo-Rich M23C6 Carbides in Alloy 718

Characterization of complex carbide–silicide precipitates in a Ni–Cr–Mo–Fe–Si alloy modified by welding

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The effect of silicon on precipitation and decomposition behaviors of M6C carbide in a Ni–Mo–Cr superalloy

Cited by 98 publications

References 12 publications

Effect of the [U(IV)]/[U(III)] ratio on selective chromium corrosion and tellurium intergranular cracking of Hastelloy N alloy in the fuel LiF-BeF2-UF4 salt

Effect of the [U(IV)]/[U(III)] ratio on selective chromium corrosion and tellurium intergranular cracking of Hastelloy N alloy in the fuel LiF-BeF2-UF4 salt

Identification of Mo-Rich M23C6 Carbides in Alloy 718

Characterization of complex carbide–silicide precipitates in a Ni–Cr–Mo–Fe–Si alloy modified by welding

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Product

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Effect of the [U(IV)]/[U(III)] ratio on selective chromium corrosion and tellurium intergranular cracking of Hastelloy N alloy in the fuel LiF-BeF₂-UF₄ salt

Effect of the [U(IV)]/[U(III)] ratio on selective chromium corrosion and tellurium intergranular cracking of Hastelloy N alloy in the fuel LiF-BeF₂-UF₄ salt