Toward the multiscale nature of stress corrosion cracking

Liu, Xiaolong; Hwang, Woonggi; Park, Jaewoong; Van, Donghyun; Chang, Yunlong; Lee, Seung Hwan; Kim, Sung-Yup; Han, Sang Suk; Lee, Bo-Young

doi:10.1016/j.net.2017.10.014

Cited by 18 publications

(10 citation statements)

References 131 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Rounded shaped crack tips can be related to the strain-induced dislocation slipping in the surrounding microstructure under the influence of the high external deformation rates. Strain-induced crack tip failure is hence associated with the dislocation dynamics and stress-strain profiles in the near vicinity of the crack tips [5]. As the straining ensues, the localised deformation becomes more severe and additional microstructural defects such as twin systems are introduced.…”

Section: Scc Mechanismsmentioning

confidence: 99%

“…Despite the increasing collection of experimental data and the numerous models proposed in the literature, stress corrosion cracking (SCC) continues to puzzle the scientific community due to the complexity of the underlying physical mechanisms [1][2][3][4][5]. Concerning nuclear power plant (NPP) internals, SCC occurs due to the interplay of several material degradation phenomena that include factors such as stress, water chemistry, temperature and material composition alterations.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

TEM investigation of SCC crack tips in high Si stainless steel tapered specimens

Penders

Konstantinović

Renterghem

et al. 2021

Corrosion Engineering, Science and Technology

View full text Add to dashboard Cite

The stress corrosion cracking (SCC) mechanism is investigated in high Si duplex stainless steel in a simulated PWR environment based on TEM analysis of FIB-extracted SCC crack tips. The microstructural investigation in the near vicinity of SCC crack tips illustrates a strain-rate dependence in SCC mechanisms. Detailed analysis of the crack tip morphology, that includes crack tip oxidation and surrounding deformation field, indicates the existence of an interplay between corrosion-and deformation-driven failure as a function of the strain rate. Slow strain-rate crack tips exhibit a narrow cleavage failure which can be linked to the film-induced failure mechanism, while rounded shaped crack tips for faster strain rates could be related to the strain-induced failure. As a result, two nominal strain-rate-dependent failure regimes dominated either by corrosion or deformation-driven cracking mechanisms can be distinguished.

show abstract

Section: Scc Mechanismsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

TEM investigation of SCC crack tips in high Si stainless steel tapered specimens

Penders

Konstantinović

Renterghem

et al. 2021

Corrosion Engineering, Science and Technology

View full text Add to dashboard Cite

show abstract

“…Based on PWR primary coolant water chemistry conditions, it has been reported that iron oxides are the main component in oxide films formed on carbon steels. It was also well known that oxide films, formed on stainless and nickel-based alloys in high temperature water, had a double-layer structure: a (Ni, Fe)-rich outer layer and a Cr-rich inner layer [ 3 , 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis and Crystallographic Properties of MFe2O4, MCr2O4 and MAl2O4 (M = Fe, Ni, Zn) Formed on Structural Materials in Pressurized Water Reactor Primary Circuit under Zinc and Zinc-aluminum Water Chemistry

Jiao

Zhang

2022

Entropy

View full text Add to dashboard Cite

Zinc injection technology (zinc water chemistry, ZWC) was widely applied in pressurized water reactor (PWR) primary circuits to reduce radiation buildup and improve corrosion resistance of structural materials. The simultaneous injection of zinc-aluminium (ZAWC) is a novel implement created to replace part of Zn2+ by Al3+. It was reported ZAWC can improve further corrosion resistance of carbon steels and stainless steels. However, ZAWC sometimes showed even negative effects on Nickel-alloys. In this study, mechanism of formation of oxide film on metals was investigated. The reactions of Fe2+ Ni2+ in oxide films replaced by Zn2+, or Fe3+ replaced by Al3+ in ZAWC were analysed. The thermodynamic data and solubility of mixed oxides (ZnFe2O4, ZnCr2O4, and ZnAl2O4), the products of replace reactions, were calculated. According to the Gibbs free energy difference between products and reactants, values of the formation reaction of ZnFe2O4, ZnCr2O4, and ZnAl2O4 are extremely negative. Solubility of ZnAl2O4 is the lowest among mixed oxide products, which implies the oxide film composites of ZnAl2O4 may show a lower corrosion rate. In addition, the preferential formation of NiAl2O4 on Ni-based-alloy, under ZAWC, was discussed based on crystallographic properties of spinel, which was considered as the cause of negative effects of ZAWC on corrosion resistance of Nickel-alloys. This research provides an analytical basis for the study of thermodynamic stability of oxide films under different chemical chemistry and a theoretical basis for improving corrosion resistance of different metals and optimizing the chemical conditions of PWR primary circuit.

show abstract

“…SCC is a slow crack growth process under the combination of environment, material, and load stress in the crack tip area [ 2 ]. Because of the heterogeneous microstructure and mechanical properties in the bi-material interface regions, the dissimilar metal weld joint (DMWJ) is more susceptible to SCC and becomes the weakest link of structural materials in the pressurized water reactor (PWR) [ 3 , 4 ]. The stress and strain condition around the crack tip is a critical factor affecting the SCC behaviors [ 1 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Mechanical Heterogeneity on Strain and Stress Fields at Crack Tips of SCC in Dissimilar Metal Welded Joints

et al. 2021

View full text Add to dashboard Cite

The crack tip strain and stress condition are one of the main factors affecting stress corrosion cracking (SCC) behaviors in the dissimilar metal welded joint of the primary circuit in the pressurized water reactor. The mechanical property mismatch of base metal and weld metal can significantly affect the stress and strain condition around the crack tip. To understand the effect of different weld metals on strain and stress fields at SCC crack tips, the effects of strength mismatch, work hardening mismatch, and their synergy on the strain and stress field of SCC in the bi-material interface, including plastic zone, stress state, and corresponding J-integral, are investigated in small-scale yielding using the finite element method. The results show a significant effect of the strength mismatch and work hardening mismatch on the plastic zone and stress state in the weld metal and a negligible effect in the base metal. J-integral decreases with the single increase in either strength mismatch or work hardening mismatch. Either the increase in strength mismatch or work hardening mismatch will inhibit the other’s effect on the J-integral, and a synthetic mismatch factor can express this synergistic effect.

show abstract

Toward the multiscale nature of stress corrosion cracking

Cited by 18 publications

References 131 publications

TEM investigation of SCC crack tips in high Si stainless steel tapered specimens

TEM investigation of SCC crack tips in high Si stainless steel tapered specimens

Thermodynamic Analysis and Crystallographic Properties of MFe2O4, MCr2O4 and MAl2O4 (M = Fe, Ni, Zn) Formed on Structural Materials in Pressurized Water Reactor Primary Circuit under Zinc and Zinc-aluminum Water Chemistry

Effect of Mechanical Heterogeneity on Strain and Stress Fields at Crack Tips of SCC in Dissimilar Metal Welded Joints

Contact Info

Product

Resources

About