Stress corrosion cracking initiation susceptibility of Alloy 182 with different surface treatments

Investigation of surface treatment effects on the environmentally-assisted cracking behaviour of Alloy 182 in boiling water reactor environment

“…However, this accelerated technique could overlook the precursor events of EAC initiation [25] and need to be verified by additional constant load tests. Effect of the surface treatment processes on EAC initiation is partly verified by our preliminary constant load test results and high-temperature electrochemical measurements [11]. The sequence of the EAC initiation susceptibility of the investigated surface machining processes determined by constant load tests have been found similar to that from CERT tests [11].…”

“…ZView software (Scribner Associates) was used to model the low-frequency part of the impedance spectra (the total spectra is published in [11]) with the simple electrical analogue model (R 1 -Ws 1 ) shown in Figure 11 (Nyquist-plot). The diffusion coefficients for ionic transfer of interstitial cations through the inner oxide, calculated from the analogue model for the RS and SP surfaces, were D RS = 1.4•10 −12 cm 2 s −1 and D SP = 5.7•10 −12 cm 2 s −1 , respectively.…”

“…The diffusion coefficients for ionic transfer of interstitial cations through the inner oxide, calculated from the analogue model for the RS and SP surfaces, were D RS = 1.4•10 −12 cm 2 s −1 and D SP = 5.7•10 −12 cm 2 s −1 , respectively. These diffusion coefficients are rather high, at least partially due to using the total oxide thickness of about 200 nm [11] to represent the barrier oxide layer thickness. The oxide thickness chosen for the calculation, while affecting the absolute value of the diffusion coefficients, does not influence their relative magnitudes.…”

Comparison of the effect of water jet cavitation peening on stress corrosion cracking behavior of nickel-based alloy 600 and alloy 182 in high temperature water

“…Among these, the effect of SP on SCC resistance of the alloy in high temperature water was not consistent and has a huge discrepancy. Que et al (2022) found that SP-treated Alloy 182 showed a higher SCC susceptibility due to the deterioration of the surface state and the following formation of a porous oxide film. Similar results can also be obtained in the investigation of Hur et al (2004).…”

“…At present, surface peening such as traditional shot peening (SP), laser shock peening (LSP) and water jet cavitation peening (WJP) are used to relieve the SCC of the alloys due to the improvement of stress state (Que et al , 2022; Hur et al , 2004). Among these, the effect of SP on SCC resistance of the alloy in high temperature water was not consistent and has a huge discrepancy.…”