Environmentally assisted crack growth in one-dimensionally cold worked Alloy 690TT in primary water

Peng, Qunjia; Hou, Juan; Yonezawa, Takeshi; Shoji, Tetsuo; Zhang, Z. M.; Huang, Feng; Han, En‐Hou; Ke, Wei

doi:10.1016/j.corsci.2011.12.031

Cited by 45 publications

(13 citation statements)

References 17 publications

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“…Bruemmer et al [33] proposed that grain boundary carbides enhance localized grain boundary deformation and induce high interfacial strain during cold rolling, which increases the susceptibility to crack growth. Their work also [20] indicated that high grain boundary strains raised by carbides promoted SCC propagation rates, not the preexisting voids and cracked carbides as IG cracks seemed to blunt at the cracked carbides although Peng et al [34] suggested that fractured carbide and void at the grain boundary might promote IG cracking. So grain boundary carbides seem to have detrimental effect in SCC growth due to the enhanced local strains near grain boundaries.…”

Section: Effect Of Grain Boundary Carbidesmentioning

confidence: 96%

The effects of grain boundary carbide density and strain rate on the stress corrosion cracking behavior of cold rolled Alloy 690

Kuang

Was

2015

Corrosion Science

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a b s t r a c tThe effects of grain boundary carbide density and strain rate on stress corrosion cracking (SCC) initiation susceptibility of cold rolled 690 were evaluated in 360°C hydrogenated water using slow strain rate tensile (SSRT) tests. The improvement in SCC resistance of a thermally treated microstructure over that of a solution annealed microstructure indicates that grain boundary carbides have a mitigating effect in cold rolled Alloy 690. The effect of grain boundary carbides is dependent on the cold rolling orientation of sample. Slower strain rate aggravates SCC initiation by enhancing the environmental component of SCC.

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Section: Effect Of Grain Boundary Carbidesmentioning

confidence: 96%

The effects of grain boundary carbide density and strain rate on the stress corrosion cracking behavior of cold rolled Alloy 690

Kuang

Was

2015

Corrosion Science

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“…In addition, more green and yellow are observed in the grain boundaries of the Kernel average misorientation image (Figure d). Higher average Kernel misorientation correlates to higher strain concentration, which is important in intergranular SCC of austenitic stainless steel …”

Section: Resultsmentioning

confidence: 99%

Evaluation of stress corrosion cracking susceptibility of forged 316 stainless steel in simulated primary water

Zhu

Wang

Ming

et al. 2017

Materials & Corrosion

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The bolts for the reactor coolant pump are planned to be made of the forged 316 stainless steel. Prior to use, the stress corrosion cracking (SCC) resistance of the material requires investigation in simulated primary water at 320 °C. The crack growth rates (CGRs) of two duplicate compact tension (CT) specimens are measured using direct current potential drop method. The effects of stress intensity factor (K, changes from 21 to 41 MPa√m), dissolved oxygen (DO, changes from <10 to 2000 ppb) and dissolved hydrogen (DH, 2800 ppb) on CGRs are comprehensively examined. The results indicate that CGR increases with increasing K. The forged 316 stainless steel is sensitive to SCC in oxygenated water. Changing oxygenated water to hydrogenated water leads to more than one order of magnitude decreases of CGR. The fracture surface, crack path, and the influence of the crack branching on CGR are discussed.

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“…The results suggest that plastic strain by itself cannot explain the high crack growth rates. Synergetic effects of cold work and microstructural features, for example, banding phenomena, cracking of intergranular carbides, and strain localization at grain boundaries, have thus attracted increased attention in recent years [9,12,13].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Investigation of Three Alloy 690 Mockup Components: Base Metal and Welding Induced Changes

Shen

Kaplan

Efsing

2014

International Journal of Nuclear Energy

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The stress corrosion cracking (SCC) resistance of cold deformed thermally treated (TT) Alloy 690 has been questioned in recent years. As a step towards understanding its relevancy for weld deformed Alloy 690 in operating plants, Alloy 690 base metal and heat affected zone (HAZ) microstructures of three mockup components have been studied. All mockups were manufactured using commercial heats and welding procedures in order to attain results relevant to the materials in the field. Thermodynamic calculations were performed to add confidence in phase identification as well as understanding of the evolution of the microstructure with temperature. Ti(C,N) banding was found in all materials. Bands with few large Ti(C,N) precipitates had negligible effect on the microstructure, whereas bands consisting of numerous small precipitates were associated with locally finer grains and coarserM23C6grain boundary carbides. The Ti(C,N) remained unaffected in the HAZ while theM23C6carbides were fully dissolved close to the fusion line. Cold deformed solution annealed Alloy 690 is believed to be a better representation of this region than cold deformed TT Alloy 690.

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Environmentally assisted crack growth in one-dimensionally cold worked Alloy 690TT in primary water

Cited by 45 publications

References 17 publications

The effects of grain boundary carbide density and strain rate on the stress corrosion cracking behavior of cold rolled Alloy 690

The effects of grain boundary carbide density and strain rate on the stress corrosion cracking behavior of cold rolled Alloy 690

Evaluation of stress corrosion cracking susceptibility of forged 316 stainless steel in simulated primary water

Experimental and Theoretical Investigation of Three Alloy 690 Mockup Components: Base Metal and Welding Induced Changes

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