Stress Corrosion Cracking of Austenitic Alloys in Supercritical Water

Teysseyre, S.; Was, Gary S.

doi:10.5006/1.3278244

Cited by 60 publications

(28 citation statements)

References 2 publications

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“…From those data, crack length per unit area, crack density (number of cracks per unit area) and averaged crack length were calculated. These parameters especially crack length per unit area have long been used to assess the SCC initiation susceptibility of materials [27,28]. The validity of these data may be questioned due to the fact that the surface SCC cracks are scarce and shallow.…”

Section: Apparatus and Methodologymentioning

confidence: 99%

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: Apparatus and Methodologymentioning

confidence: 99%

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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“…The oxidation process can be generally explained by the thermodynamic as well as the ion migration rule. The oxidation reaction formula is simply described as Equation (2). At a specified temperature, the standard gibbs free energy formula of the oxide formation is given as Equation (3) [16].…”

Section: Corrosion Mechanismmentioning

confidence: 99%

“…Supercritical water cooled reactor (SCWR) has been considered as one of the most promising candidates of Generation IV fission advanced reactors due to its high thermal efficiency, high safety as well as simple design without steam generators and steam separators [1][2][3][4]. However, the SCWR is designed to function at an operating environment of $550 8C/25 MPa, which is notably higher than the thermodynamic critical point of water (374 8C/ 22 MPa) [5,6].…”

Section: Introductionmentioning

confidence: 99%

Corrosion behavior of a 304-oxide dispersion strengthened austenitic stainless steel in supercritical water

Zhou

Zhang

et al. 2015

Materials and Corrosion

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The corrosion behavior of a 304 oxide dispersion strengthened (ODS) austenitic stainless steel after being exposed to supercritical water (SCW) with dissolved oxygen of 300 ppb at 600 8C/25 MPa was studied. By the means of a least-square fit, the weight gain (Dw) of the samples as a function of exposure time (t) could be described by the equation Dw ¼ 8.011 Â t 0.459 . An approximately parabolic time law in this specified SCW environment can be assumed. A triple protective oxide layer formed on the surface of the metal with the exposure time up to 1000 h. Furthermore, the result of slow-strain rate tensile (SSRT) test indicated that the 304-ODS austenitic stainless steel was not susceptible to stress corrosion cracking (SCC) in SCW at 600 8C/25 MPa.

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“…The embrittlement was greater at slower strain rate. It should also be noted that all experiments were conducted at room temperature; the susceptibility of SS304 to SCC increases at high temperatures [35,38,39].…”

Section: Generation Ii: Ni-cu and Ni-cu-pd Sma Weldsmentioning

confidence: 99%

A corrosion study of nickel–copper and nickel–copper–palladium welding filler metals

Liang¹,

Sowards²,

Frankel³

et al. 2010

Materials & Corrosion

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In an effort to reduce the release of fumes containing carcinogenic Cr 6þ during arc welding of stainless steel, Cr-free filler metals for welding of SS304 have been developed. Corrosion studies were carried out on 304L stainless steel samples welded with these Cr-free consumables. The corrosion properties of gas tungsten arc (GTA) and shielded metal arc (SMA) welds fabricated with Ni-Cu and Ni-Cu-Pd consumables were found to be comparable to those of welds fabricated with SS308L, the standard filler metal used with SS304. Although the breakdown potentials of the welds made using both welding processes were lower than that of the SS308L GTA weld, the repassivation potentials of these welds were much higher. Generally, the repassivation potential is a more conservative measure of susceptibility to localized corrosion. Accordingly, the Ni-Cu and Ni-Cu-Pd welds were more resistant to crevice corrosion than SS308L welds. The addition of a small amount of Pd improved the corrosion resistance relative to Ni-Cu welds, which is consistent with previous studies from specially-prepared button samples and bead-on-plate samples. Other corrosion studies such as creviced and uncreviced long time immersion, atmospheric exposure, and slow strain rate testing suggest that Ni-Cu-Pd filler metal can be a potential replacement for the conventional SS308L filler metal for joining SS304.

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Stress Corrosion Cracking of Austenitic Alloys in Supercritical Water

Cited by 60 publications

References 2 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

Corrosion behavior of a 304-oxide dispersion strengthened austenitic stainless steel in supercritical water

A corrosion study of nickel–copper and nickel–copper–palladium welding filler metals

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