Creep resistance and material degradation of a candidate Ni–Mo–Cr corrosion resistant alloy

Shrestha, Sachin L.; Bhattacharyya, Dhriti; Yuan, Guangzhou; Li, Zhijun J.; Budzakoska-Testone, Elizabeth; Whittle, Karl R.; Drew, Michael; Edwards, L.

doi:10.1016/j.msea.2016.07.032

Cited by 21 publications

(4 citation statements)

References 25 publications

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“…Particularly, triple GB precipitation, which results in stress concentration, generates the main failure area in the creep process. Under stress application, GB sliding produces holes or wedge cracks 44,45 . In addition, carbide precipitation consumes carbon in the adjacent matrix, resulting in the softening of the adjacent material 46 .…”

Section: Discussionmentioning

confidence: 99%

“…In addition, an increase in Cr content can improve the reparability of a passive film of steel. Hastelloy N is solution-strengthened with 16 wt % Mo, which stabilises the Ni 2 Mo 4 (C,Si) and Ni 3 Mo 3 (C,Si) primary precipitates in the alloys 45,49 , and exhibits excellent creep resistance. In addition, colossal supersaturation with C continuously induces the diffusion of Cr and Mo to the GBs owing to their high carbon affinity 42 , thereby resulting in the easy formation of carbides without saturation.…”

Section: Discussionmentioning

confidence: 99%

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Stress-assisted corrosion behaviour of Hastelloy N in FLiNaK molten salt environment

Zhang

et al. 2022

npj Mater Degrad

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The use of molten-salt–based energy production and storage systems requires high-temperature corrosion- and creep-resistant structural materials. This study investigated the microstructure evolution and corrosion characteristics of Hastelloy N under working stress in a molten salt environment. Selective diffusion of Cr at the grain boundaries (GBs) of the Hastelloy N degraded the properties of the GBs, making them preferred locations for corrosion crack invasion. Stress further promoted Cr diffusion and accelerated GB carbide precipitation, thereby forming a corrosion couple between the carbide and matrix that facilitated the expansion of intergranular corrosion cracks into the grains. These findings are useful for providing advances in the design of novel structural alloys with extraordinary property-microstructure stability combinations for resistant to complex molten salt environments.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Stress-assisted corrosion behaviour of Hastelloy N in FLiNaK molten salt environment

Zhang

et al. 2022

npj Mater Degrad

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“…Super alloys remain created with nickel, nickel-iron, or cobalt which demonstrate a combination of mechanical strength and resistance to surface degradation and thus, favorably used in high-performance industrial applications where the ability to sustain high temperature, corrosive medium is of prime importance. The nickel super alloys are ideal materials for the components and elements of pumps, valves, piping arrangements, process equipment, turbines and assemblies in the marine, chemical processing, oil and accelerator pedal, aerospace, railway locomotive and military manufactures as they can withstand rough environments by exhibiting high heat resistance, erosion resistance and acid resistance [1]. Among all the nickel-based super alloys, Hastelloy (nickel-chromium-molybdenum alloys) is regarded as one of the best as the inclusion of molybdenum makes it harder, stronger at high temperatures, and also suitable for welding applications.…”

Section: Introductionmentioning

confidence: 99%

Hardness Along with Electrochemical Corrosion Performance Examination of Hastelloy C276

Sahu*¹,

Kund²

2019

IJITEE

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Hastelloy C276 a versatile corrosion resistant alloy, is investigated at 298 K. The tribological properties such as frictional force, In the micro-hardness test at 40 N load, the hardness is increased by 25 % as compared to 10, 20, 30 N loading conditions. The experimental results indicated reduction in coefficient of friction values and thus an increase in the frictional force with the increase in normal load. The images of worn out surfaces confirm that the delamination and adhesion causes the material removal from the surface in dry sliding. Further, the analysis of the hardness characteristics of worn out surfaces shows surface hardening during sliding wear process under 40 N loads. The study on the corrosion wear behavior in the sulphuric acid showed a significantly lower value of corrosion rate (0.0016579 mm/y in H2SO4 solution) in comparison to other alloys frequently used in industries.

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“…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

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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.

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Creep resistance and material degradation of a candidate Ni–Mo–Cr corrosion resistant alloy

Cited by 21 publications

References 25 publications

Stress-assisted corrosion behaviour of Hastelloy N in FLiNaK molten salt environment

Stress-assisted corrosion behaviour of Hastelloy N in FLiNaK molten salt environment

Hardness Along with Electrochemical Corrosion Performance Examination of Hastelloy C276

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

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