Effect of maximum stress intensity factor, loading mode, and temperature on corrosion fatigue cracking behavior of Inconel 617 in supercritical water

Khan, Hasan Izhar; Zhang, Naiqiang; Xu, Weiqiao; Zhu, Zhongliang; Jiang, Dongfang; Xu, Hong

doi:10.1016/j.ijfatigue.2018.08.035

Cited by 21 publications

(9 citation statements)

References 37 publications

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“…SSRT experiments were conducted on the self-developed dynamic SCW stress corrosion test platform. The details of principle and structure of the platform can be found in the work of Khan et al 38,39 After primary and secondary pre-heating, water was introduced into the autoclave (2.83 l) and subsequently cooled to room temperature through air cooling and water cooling, respectively. The function of autoclave was to finally reach and maintain temperature and pressure at desired values.…”

Section: Methodsmentioning

confidence: 99%

Effect of medium and pressure on stress corrosion cracking susceptibility of a nickel-based alloy

Chen,

Zhu,

Liu

et al. 2024

Corrosion Engineering, Science and Technology: The Internationa

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Nickel-based alloy Inconel 617 is a candidate material for advanced ultra-supercritical units. Stress corrosion cracking (SCC) susceptibility of Inconel 617 under low-pressure superheated steam (0.1 MPa), high-pressure superheated steam (8 MPa) and supercritical water (25 MPa) at 650 °C was studied through slow strain rate tensile tests at strain rate of 5 × 10−7 s−1. The results indicate that Inconel 617 is susceptible to SCC in both superheated steam and supercritical water, with susceptibility increasing with pressure. In a nitrogen atmosphere, fractures were predominantly transgranular ductile. The fracture surface featured dimples and micropores. In three corrosive environments, both intergranular and transgranular fractures were observed. The rock sugar-like morphology becomes more and more obvious as the pressure increases. A large number of cracks perpendicular to the loading axis were found on gauge surface. The SCC mechanism for Inconel 617 in superheated steam and supercritical water conditions is internal oxidation.

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Section: Methodsmentioning

confidence: 99%

Effect of medium and pressure on stress corrosion cracking susceptibility of a nickel-based alloy

Chen,

Zhu,

Liu

et al. 2024

Corrosion Engineering, Science and Technology: The Internationa

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“…Schematic diagram of the corrosion fatigue (CF) test loop. [ 38 ] [Color figure can be viewed at wileyonlinelibrary.com]…”

Section: Methodsmentioning

confidence: 99%

“…First, mechanical polishing of the inner surface was done using F I G U R E 2 Schematic diagram of the corrosion fatigue (CF) test loop. [38] [Color figure can be viewed at wileyonlinelibrary.com] silicon carbide paper and paste whereas further cleansing was done in a solution of acetone and pure water and then dried. After this, CPP is analyzed by taking scanning electron microscope (SEM) images of the specimen.…”

Section: Stress Corrosion Crack Growth Testsmentioning

confidence: 99%

“…The residual life of these components is typically determined by using fatigue crack growth rate (FCGR) curves. Experiments and analysis for FCGR of different nickel alloys have been conducted, including alloy 600, alloy 690, and alloy 617, [33,[35][36][37][38] in a pure water environment at higher temperatures. These experiments aimed to analyze the effects of high temperature, water chemistry, and stress intensity on CGR.…”

Section: Introductionmentioning

confidence: 99%

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Effect of temperature and medium environment on corrosion fatigue behavior of Inconel 625

Ghazi

Khan

Farooq

et al. 2023

Materials & Corrosion

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Inconel 625 is a nickel‐based alloy with exceptional creep and corrosion resistance properties. It has emerged as a candidate material for operational and structural use in critical and supercritical power generation plants. Supercritical power plants work at high temperatures, pressure and in an erosive environment that makes metallic materials more vulnerable to corrosion fatigue. This study aimed to evaluate the fatigue crack growth rate (FCGR) at elevated temperatures (550–650°C) in a steam and supercritical water environment. All the experiments were performed at a water oxygen level of 8000 ppb. A cyclic stress of 1 Hz frequency and sine waveform was applied for the test. A 0.6 stress ratio was applied with a maximum stress intensity factor of 32 MPa√m. A direct current potential drop method was applied to detect the crack growth rate (CGR). For the given parameters, fractographic analysis validated the role of corrosion‐fatigue interaction as the primary source of variation in the FCGR. Results revealed that the CGR was enhanced with a rise in temperature under all test environments. The influencing mechanism of temperature on CGR was also discussed.

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“…Haynes 230 and CCA 617, for the components in superheaters, reheaters and steam transfer pipes, owing to their better resistance to creep damage and steam oxidation [4][5] .…”

Section: Introductionmentioning

confidence: 99%

Thermal and stress analyses of a novel coated steam dual pipe system for use in advanced ultra-supercritical power plant

Guo

Sun

Becker

et al. 2019

International Journal of Pressure Vessels and Piping

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Improving the energy efficiency of advanced ultra-supercritical power plants, by increasing steam operating temperature up to 700℃, can be achieved, at reduced cost, by using novel engineering design concepts, such as coated steam pipe systems manufactured from high temperature materials commonly used in current operational power plants. This paper describes a preliminary feasibility analysis of the design concept of a novel coated dual pipe system under steady-state operation, using analytical and finite element models to evaluate the possible thermal gradients and stresses generated. The results show that the protective coating layer contributes to the effective reduction in the surface temperature of the primary steel pipe. Thermal stresses generated due to the significant difference in the thermal and mechanical properties of the coating and substrate pipe are larger than the mechanical stresses generated by the combined effects of the internal steam pressure in the primary steam pipe and external pressure from the counter-flow cooling steam during steady-state operation. Compared with the stress relaxation of the coating and substrate pipe, creep has a significant impact on the stress distribution within the coating layer. Several key factors have been identified, such as the coating thickness, conductivity, thermal expansion, heat transfer coefficient of cooling steam, cooling steam temperature and cooling steam pressure, which are found to govern thermal and stress distributions during steady-state operation.

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Effect of maximum stress intensity factor, loading mode, and temperature on corrosion fatigue cracking behavior of Inconel 617 in supercritical water

Cited by 21 publications

References 37 publications

Effect of medium and pressure on stress corrosion cracking susceptibility of a nickel-based alloy

Effect of medium and pressure on stress corrosion cracking susceptibility of a nickel-based alloy

Effect of temperature and medium environment on corrosion fatigue behavior of Inconel 625

Thermal and stress analyses of a novel coated steam dual pipe system for use in advanced ultra-supercritical power plant

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