On the hydrogen embrittlement behavior of nickel-based alloys: Alloys 718 and 725

Lu, Xu; Ma, Yan; Wang, Dong

doi:10.1016/j.msea.2020.139785

Cited by 56 publications

(21 citation statements)

References 54 publications

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“…Despite the limitations, it is observed that they have found application in heat exchangers due to their corrosion resistance, implying that their level of resistance can be improved for a specified application in heat exchangers. Some commonly used nickel-based alloys include Incoloy 825, Inconel 600/625, Chlorimet, Cast nickel, and Hastelloy [82–88]. Similarly, in the work of Reddy et al [59], pitting corrosion was found in the stainless steel samples, and they used Inconel 625 to protect it through the laser cladding technique, owing to the excellent corrosion resistance of Inconel 625.…”

Section: Materials Selection For Heat Exchangersmentioning

confidence: 99%

The potential use of laser cladded functionally graded materials to mitigate degradation in boiler tube heat exchangers for power plant applications: A review

Morake,

Mutua,

Ruthandi

et al. 2023

Surface Engineering

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Surface modification is essential to safeguard heat exchangers from premature failure spurred by deterioration mechanisms such as corrosion and wear, which diminish performance. Meanwhile, modifying some substrates with dissimilar materials is challenging due to a mismatch in material properties. Moreover, individual alloy coatings on substrates are usually insufficient in the required material properties, leading to accelerated failure of equipment, especially in power plant industries. This article summarised the knowledge base on functionally graded materials (FGMs) while emphasising how this promising class of novel materials can reduce deterioration. Additionally, laser cladding is established to be a suitable technique for processing FGMs. A particular focus is laid on the laser beam interaction with the FGM and expounding on the processing and material parameters that affect the microstructural properties of FGMs. The development prospects for processing FGMs with superior clad quality characteristics to increase boiler pipes' service life and performance are also highlighted.

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Section: Materials Selection For Heat Exchangersmentioning

confidence: 99%

The potential use of laser cladded functionally graded materials to mitigate degradation in boiler tube heat exchangers for power plant applications: A review

Morake,

Mutua,

Ruthandi

et al. 2023

Surface Engineering

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“…To maintain the mentioned overall concentrations with c 0 = 4 × 10 −5 , the models were initially loaded so that there is enough pressure field and misfit volume to accommodate the mentioned concentrations. The loaded configuration is then taken as the reference configuration in the Python code to insert c (x) according to equation (1). The concentration of vacancies, c Va , in the same region in which hydrogen is inserted, is kept in the ratio (number of vacancies/numbers of H atoms) of 0.15, such that c Va = 0.15 c H .…”

Section: Atomistic Model For Crack Tip Deformationmentioning

confidence: 99%

“…Also in the oil and gas industry, the structural materials which are mainly nickel based superalloys are subjected to high-pressure and high temperature environment under corrosive gases such as CO 2 and H 2 S [1]. Thus, the introduction of hydrogen at high temperature and pressure conditions causes undesirable consequences in these industrially important nickel based alloys and other metals, such as loss of ductility, strength, fracture toughness, and causes earlier crack nucleation while causing fast crack propagation thus affecting their fatigue life [1][2][3][4][5]. This deterioration in the properties of metals is commonly referred to as hydrogen embrittlement (HE).…”

Section: Introductionmentioning

confidence: 99%

On the role of vacancy-hydrogen complexes on dislocation nucleation and propagation in metals

Arora,

Singh,

Adlakha

et al. 2023

Modelling Simul. Mater. Sci. Eng.

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New insights are provided into the role of vacancy-hydrogen (VaH) complexes, compared to the hydrogen atoms alone, on hydrogen embrittlement of nickel. The effect of the concentration of hydrogen atoms and VaH complexes is investigated in different crystal orientations on dislocation emission and propagation in single crystal of nickel using atomistic simulations. At first, embrittlement is studied on the basis of unstable and stable stacking fault energies as well as fracture energy to quantify the embrittlement ratio (unstable stacking fault energy/fracture energy). It is found that VaH complexes lead to high embrittlement compared to H atoms alone. Next, dislocation emission and propagation at pre-cracked single crystal crack-tip are investigated under Mode-I loading. Depending upon the elastic interaction energy and misfit volume, high local concentrations at the crack front lead to the formation of nickel-hydride and nickel-hydride with vacancies phases. These phases are shown to cause softening due to earlier and increased dislocation emission from the interface region. On the other hand, dislocation propagation under the random distribution of hydrogen atoms and VaH complexes at the crack front or along the slip plane shows that VaH complexes lead to hardening that corroborates well with the increased shear stresses observed along the slip plane. Further, VaH complexes lead to the disintegration of partial dislocation and a decrease in dislocation travel distance with respect to time. The softening during emission and hardening during propagation and disintegration of partial dislocation loops due to VaH complexes fit the experimental observations of various dislocation structures on fractured surfaces in the presence of hydrogen, as reported in literature.

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“…Despite this high corrosion resistance, these alloys remain susceptible to pitting and crevice corrosion and hydrogen embrittlement (HE) when sulfur and halide ions are present. [15] Given their high resistance to stress corrosion cracking (SCC), nickel-based alloys are also a good choice in acid industries, and especially at high temperatures. Nickel-based alloys such as Alloy 600, Alloy 690, Alloy X-750, and Alloy 800 are also wellknown for their use in nuclear power plant components, particularly in pressurized water reactors (PWR), Canada deuterium uranium (CANDU®) and super critical water (SCW) reactors.…”

Section: Introductionmentioning

confidence: 99%

Effect of alloying elements on aqueous corrosion of nickel‐based alloys at high temperatures: A review

Karimihaghighi

Naghizadeh

2023

Materials & Corrosion

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Nickel-based alloys are well-known multicomponent alloys with a composition carefully balanced to provide the desired properties for various industrial applications. While these alloys are corrosion resistant, under severe conditions corrosion can still occur, which can result in serious damage to a system in operation. To improve their reliability, the composition of nickelbased alloys can be tailored to particular operating conditions. To improve their corrosion resistance, alloying elements such as chromium, molybdenum (+tungsten), and copper can be added, which promote the oxide formation process and thereby contribute to oxide passivity. This paper reviews and draws conclusions from existing literature on nickel-based alloy corrosion and oxide formation in high-temperature environments.

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On the hydrogen embrittlement behavior of nickel-based alloys: Alloys 718 and 725

Cited by 56 publications

References 54 publications

The potential use of laser cladded functionally graded materials to mitigate degradation in boiler tube heat exchangers for power plant applications: A review

The potential use of laser cladded functionally graded materials to mitigate degradation in boiler tube heat exchangers for power plant applications: A review

On the role of vacancy-hydrogen complexes on dislocation nucleation and propagation in metals

Effect of alloying elements on aqueous corrosion of nickel‐based alloys at high temperatures: A review

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