Role of Slip Step Emergence in the Early Stages of Stress Corrosion Cracking in Face Centered Iron-Nickel-Chromium Alloys

Smith, Tony; Staehle, R. W.

doi:10.5006/0010-9312-23.5.117

Cited by 58 publications

(7 citation statements)

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“…10). 32) Although SCC extension is generally considered to be parallel to the direction of the plane of maximum tensile stress, 33,34) this direction does not agree with the present observation. Thus, the present finding is consistent with the idea 35) that SCC is not a mechanical fracture phenomenon directly defined by stress states but a dissolution phenomenon defined by the texture of materials (such as slip band) and the environment.…”

Section: Comparison With Optical Observation Of the Sliced Scc Specimencontrasting

confidence: 85%

Ultrasonic Measurement of Closed Stress Corrosion Crack Depth Using Subharmonic Phased Array

Ohara

Endo

Mihara

et al. 2009

Jpn. J. Appl. Phys.

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We formed a stress corrosion crack (SCC) more than 10 mm deep to simulate those generated in atomic power plants. We precisely imaged the formed SCC by a novel imaging method, namely, the subharmonic phased array for crack evaluation (SPACE), and found that it had complex branches. Subsequently, we cut the specimen for the optical observation of the cross sections, and discussed the origin of the SCC extension on the basis of the optical microscopic observation of the cross sections. To examine the open and closed parts of crack in the optical images, we superposed the crack extracted from the optical images onto the SPACE images. We compared the optically and SPACE-measured crack depths, and demonstrated that SPACE is useful in reducing the underestimation of closed-crack depths.

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Section: Comparison With Optical Observation Of the Sliced Scc Specimencontrasting

confidence: 85%

Ultrasonic Measurement of Closed Stress Corrosion Crack Depth Using Subharmonic Phased Array

Ohara

Endo

Mihara

et al. 2009

Jpn. J. Appl. Phys.

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“…Our results(8) on the effects of phosphorus and nitrogen of 18Cr-10Ni steel in boiling MgCl2 soluimmune to SCC at less than 0.003% phosphorus regardless of nitrogen content and that phosphorus increases the susceptibility to SCC because it accelerates local corrosion by making the dislocation arrangement planar as well as improving the protectiveness of the film. In addition, it was ascertained that specific oriented crystals dissolve anisotropically if the phosphorus content is increased (33). The present experiment also revealed that the susceptibility to SCC is decreased especially in boiling 42% or more concentrated solution by decreasing phosphorus content.…”

Section: Effects Of Compositionsupporting

confidence: 48%

Effect of Composition on Stress Corrosion Cracking of Austenitic Stainless Steels in Boiling MgCl<SUB>2</SUB> Solutions of Various Concentrations

Kowaka

Kudo

1975

Trans. JIM

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The effect of composition on SCC of austenitic stainless steel has been investigated in various boiling MgCl2 solutions. The stress applied was a constant load of 25kg/mm2. The relation between the boiling point of MgCl2 solution (concentration of MgCl2) and the time to fracture was determined. The results obtained are as follows:(1) Commercial stainless steels show the maximum susceptibility to SCC over a certain concentration range of boiling MgCl2 solutions.(2) The sensitized stainless steel suffers intergranular stress corrosion cracking in low-concentration boiling MgCl2 solutions.(3) Based on a study of the effect of component elements, it is found that the boiling point of MgCl2 for the minimum time to fracture is shifted to lower temperatures in presence of C and Si and to higher temperatures in presence of Mo, N, P, Cr and Cu, while Ni decreases the susceptibility to SCC over the whole temperature range investigated.(4) The time to fracture consisted of the induction time and the propagation time. The mechanism of SCC is also discussed here. (Received September 30, 1974) Although there have been numerous reports on the effect of composition on the stress corrosion cracking of austenitic stainless steels in concentrated chloride solutions, few data on the relations between the effect of composition on SCC and environmental factors are available and the majority of the studies are made in boiling The present report describes the experimental results of the effect of composition on SCC of austenitic stainless steels in various concentrated boiling MgCl2 solutions and the significance of boiling 42% MgCl2 solution as accelerating test medium. MaterialsMaterials were prepared in a high frequency induction furnace as basic 18Cr-10Ni alloy with varying C, Cu, N, P contents and a low Mo content, basic 17Cr-13Ni alloy with varying Si and Mo contents, basic 18Cr alloy with varying Ni content, and basic 10Ni alloy with varying Cr content. As P enhances the susceptibility to SCC in boiling 42% MgCl2 solution(8), the amount of P was adjusted in order to recognize the effects of alloying elements. Specimens were made through series of such processes as forging and hot rolling to 7mm thick plates and cold rolling to 4.9mm thick ones. They were soluquenched and then shaped to tensile test speci-*

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“…The preferential corrosion along the slip bands can be explained by the slip‐dissolution model of stress corrosion, and a schematic drawing of the mechanism is given in Figure . Since Ta is a low‐yield strength metal, its surface grains easily slip due to the large hot corrosion stress and supplementary energy applied by high temperatures.…”

Section: Discussionmentioning

confidence: 99%

The effect of surface treatment on the corrosion behavior of a pure Ta sheet in an equimolar NaCl–KCl melt at 850°C in air. Part 1: Laser surface melting

Zeng

et al. 2019

Materials & Corrosion

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The corrosion behavior of pure Ta and laser surface melting-treated Ta sheets was investigated in an equimolar NaCl-KCl melt at 850°C in air. The results show that the predominant factors involved in the consumption of materials were reactions that form sodium-containing oxides and Ta 2 O 5 . High corrosion stress led to slip of the untreated Ta surface grains, further resulting in preferential corrosion along slip bands. The slip of surface grains substantially deteriorated the bonding between the corrosion scale and matrix, thus leading to rapid degradation of the corrosion scale. The melt layer consisted of a thin Ta 2 O 5 film, and the inner dendrite layer demonstrated self-healing characteristics during corrosion and presented a better hot corrosion resistance than the untreated Ta owing to the excellent bonding at the scale and melt layer interface. K E Y W O R D S chloride, hot corrosion, LSM, oxidation, Ta

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Role of Slip Step Emergence in the Early Stages of Stress Corrosion Cracking in Face Centered Iron-Nickel-Chromium Alloys

Cited by 58 publications

References 0 publications

Ultrasonic Measurement of Closed Stress Corrosion Crack Depth Using Subharmonic Phased Array

Ultrasonic Measurement of Closed Stress Corrosion Crack Depth Using Subharmonic Phased Array

Effect of Composition on Stress Corrosion Cracking of Austenitic Stainless Steels in Boiling MgCl<SUB>2</SUB> Solutions of Various Concentrations

The effect of surface treatment on the corrosion behavior of a pure Ta sheet in an equimolar NaCl–KCl melt at 850°C in air. Part 1: Laser surface melting

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