Effects of exposing duration on corrosion performance in weld joint of Ni-Mo-Cr alloy in FLiNaK molten salt

Hou, Juan; Yu, Ge; Zeng, Chaoliu; Ai, Hua; Xie, Ren; Chen, Yanjun; Zhou, Xingtai; Xie, Leidong; Wang, Jianqiang

doi:10.1016/j.jfluchem.2016.07.007

Cited by 30 publications

(10 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The depletion of Cr from the matrix leads to the formation of pitting and voids near the surface. Therefore, the Cr diffusion in the alloy substrate is the radically rate-determining step of corrosion in this work [7,21,24,25].…”

Section: Discussionmentioning

confidence: 99%

Effect of Surface Decarburization on Corrosion Behavior of GH3535 Alloy in Molten Fluoride Salts

Hou

Han

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

Self Cite

View full text Add to dashboard Cite

Corrosion test of a Ni-16Mo-7Cr alloy with a decarburized layer was conducted in FLiNaK salt at 700°C. A detailed microstructure study was performed to investigate the corrosion behavior and mechanisms. The results show that the Ferich layers were formed on the corroded alloys with and without decarburization. The surface decarburization had little influence on the corrosion resistance of the alloy, whereas it caused more M 2 C carbide formation beneath the corrosion layer. That is attributed to the higher concentration of C gradient near the alloy surface, which was resulted from the increase in C content liberated from graphite crucible wall during the corrosion process.

show abstract

Section: Discussionmentioning

confidence: 99%

Effect of Surface Decarburization on Corrosion Behavior of GH3535 Alloy in Molten Fluoride Salts

Hou

Han

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

Self Cite

View full text Add to dashboard Cite

show abstract

“…The boron equivalent is less than 2 ppm in the nuclear grade FLiBe used in the primary system, while the total oxygen is no more than 100 ppm in the high purity FLiNaK in the secondary primary system. [54][55][56] A solution has been provided to solve the corrosion issue through the optimization of the alloy composition, purification of the salt, and surface modification. 52 An experimental device was constructed by SINAP for measuring the density and liquidus temperature of molten fluorides typically used in the TMSR project.…”

Section: Molten Salt Technologymentioning

confidence: 99%

“…Series studies have been done on the fluoride salts corrosion including the corrosion mechanism, evaluation of the structural material corrosion, and corrosion prevention. [54][55][56] A solution has been provided to solve the corrosion issue through the optimization of the alloy composition, purification of the salt, and surface modification. The static corrosion rate was observed less than 2 μm per year for the structural material immersed in the highly purified FLiNaK.…”

Section: Molten Salt Technologymentioning

confidence: 99%

“…Ten tons of ingot of alloy have been successfully manufactured, whose mechanical performance and corrosion resistance are as good as the Hastelloy-N alloy. [56][57][58][59] The ultrafine grain nuclear graphite specific for MSR has been successfully developed, and difficulties have been dealt with in the scaleup process. The performances of this type of nuclear graphite, including the mechanical performance, thermodynamic, purity, and uniformity, meets the requirements of MSR.…”

Section: Structural Materials Researchmentioning

confidence: 99%

See 1 more Smart Citation

Review of conceptual design and fundamental research of molten salt reactors in China

Zhang

Liu

et al. 2018

Int J Energy Res

View full text Add to dashboard Cite

Summary Molten salt reactor (MSR) as 1 candidate of the generation IV advanced nuclear power systems attracted more attention in China due to its top ranked in fuel cycle and thorium utilization. Two types of MSR concepts were studied and developed in parallel, namely the MSR with liquid fuel and that with solid fuel. Abundant fundamental research including the neutronics modeling, thermal‐hydraulics modeling, safety analysis, material investigation, molten salts technologies etc. were carried out. Some analysis software such as COUPLE and FANCY were developed. Several experimental facilities like high‐temperature fluoride salt experiment loop have been constructed. Some passive residual heat removal systems were designed, and 1 test facility is under construction. The key MSR techniques including the extraction and separation of molten salt and construction of N‐base alloy have been mastered. Based on these fundamental research, Chinese Academy of Sciences has completed the design of thorium‐based MSRs with solid fuel and liquid fuel and is promoting their construction in the near future. In China, future efforts should be paid to the material, online fuel processing, Th‐U fuel cycle, component design, and construction and thermal‐hydraulic experiments for MSR, which are rather challenging nowadays.

show abstract

“…A wrought Ni-16Mo-7Cr base superalloy named GH3535 is developed and used as the structure material for MSR applications. It is solid-solution strengthened with 16% Mo, and contains 7% Cr for moderate oxidation resistance, which has superior corrosion resistance in molten fluoride salt and good mechanical properties [4,5,6,7]. The microstructure is composed of γ matrix with equiaxial grain size of about 70 μm and stringers of massive primary precipitates, which are determined as M 6 C carbides (M represents the metal elements).…”

Section: Introductionmentioning

confidence: 99%

Carbides Evolution in a Ni-16Mo-7Cr Base Superalloy during Long-Term Thermal Exposure

Han

Jiang

et al. 2017

Materials

Self Cite

View full text Add to dashboard Cite

The effect of long-term thermal exposure on the carbide evolution in a Ni-16Mo-7Cr base superalloy was investigated. The results show that M12C carbides are mainly precipitated on the grain boundaries during thermal exposure, and the primary massive M6C carbides can be completely transformed to M12C carbides in situ at temperatures above 750 °C for long-term thermal exposure. The transformation from M6C carbides to M12C carbides is attributed to the release of C atoms from M6C, which results in the morphology changes of massive carbides, and stabilization of the sizes of M12C carbides precipitated on the grain boundaries.

show abstract

Effects of exposing duration on corrosion performance in weld joint of Ni-Mo-Cr alloy in FLiNaK molten salt

Cited by 30 publications

References 13 publications

Effect of Surface Decarburization on Corrosion Behavior of GH3535 Alloy in Molten Fluoride Salts

Effect of Surface Decarburization on Corrosion Behavior of GH3535 Alloy in Molten Fluoride Salts

Review of conceptual design and fundamental research of molten salt reactors in China

Carbides Evolution in a Ni-16Mo-7Cr Base Superalloy during Long-Term Thermal Exposure

Contact Info

Product

Resources

About