Microprocesses in stress corrosion crack initiation in austenitic stainless steels

Hänninen, Hannu; Aho-Mantila, Irina

doi:10.1179/030716982803285864

Cited by 6 publications

(3 citation statements)

References 9 publications

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“…The conditions necessary to initiate a crack are complex and the process is generally slow. 6 Therefore crack initiation is often more essential for the time to failure than crack propagation.…”

mentioning

confidence: 99%

Pit Initiation on Stainless Steels in 1 M NaCl With and Without Mechanical Stress

Suter¹,

Webb²,

Böhni³

et al. 2001

J. Electrochem. Soc.

164

114

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The onset of pitting corrosion at MnS inclusions on 304 stainless steel in 1 M NaCl was studied with and without applied mechanical stress with use of microelectrochemical cells. Polarization curves of areas ͑100 m diam͒ without inclusion showed no pitting at potentials below that of oxidation evolution; stress had no effect on the corrosion behavior. Areas containing five round inclusions of about 4 m in size showed stable pitting at about 400 mV; the effect of stress shifted the pitting potential to values that were 150 mV more negative. Polarization curves measured on large deep MnS inclusions showed active pitting. Curves of areas with single large, shallow MnS inclusions showed multiple current transients during dissolution of the inclusion without stress, but the metastable events did not initiate stable pitting. The dissolution of shallow MnS inclusion did not form a deep microcrevice between the MnS and stainless steel matrix. However, under applied stress, cracks were formed within the shallow MnS inclusion and active pitting occurred. To explore whether such cracks might serve to generate locally high concentrations of aggressive species, the pH and chloride concentration inside a crack were simulated using a finite difference model. For experimental conditions where stable pitting was observed, the simulations predicted that the solution composition at the base of a typical 13 m deep crack correspond to a pH of around 2, and a chloride concentration of about 6 M led to stable pitting.

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mentioning

confidence: 99%

Pit Initiation on Stainless Steels in 1 M NaCl With and Without Mechanical Stress

Suter¹,

Webb²,

Böhni³

et al. 2001

J. Electrochem. Soc.

164

114

View full text Add to dashboard Cite

show abstract

“…4pkDT : : : : : : : : : : : : : (3) and the minimum useful frequency value can be calculated to be f542 Hz. This value is the lower bound in the case described, and all lower frequencies must have been rejected as useless in the analysis.…”

Section: Model Systemmentioning

confidence: 99%

“…The initiation of cracking often makes a greater contribution to the total time to failure than does propagation because the conditions necessary to initiate a crack are complicated and the process is usually slow. 2,3 Various models have been proposed for the initiation stage of SCC. Disruption of the protective surface film (the passive film) to expose bare metal to the aggressive electrolyte environment is the most common feature of each model.…”

Section: Introductionmentioning

confidence: 99%

Detection of stress corrosion cracking dynamics by dynamic electrochemical impedance spectroscopy

Darowicki¹,

Orlikowski²,

Arutunow³

2004

Corrosion Engineering, Science and Technology

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A novel dynamic electrochemical impedance spectroscopy (DEIS) technique has been developed that offers the possibility to determine impedance characteristics in a time domain during the rupture of the protective passive layer. This ability is associated with the analysis methodology of the technique, which enables selective time-frequency analysis of the measurement data. This paper proposes that the DEIS technique allows the acquisition of instantaneous changes during the passive layer cracking process, which is strongly related to the initiation stage of stress corrosion cracking. Moreover, the principles of application of the novel method in such investigations are discussed.CEST/2103

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Influence of the Ni‐Content on the Cathodic an Corrosive Hydrogen Induced Cracking Behaviour of Austenitic Alloys

Mummert

Engelmann

Schwarz

et al. 1994

Hydrogen Effects in Materials

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Microprocesses in stress corrosion crack initiation in austenitic stainless steels

Cited by 6 publications

References 9 publications

Pit Initiation on Stainless Steels in 1 M NaCl With and Without Mechanical Stress

Pit Initiation on Stainless Steels in 1 M NaCl With and Without Mechanical Stress

Detection of stress corrosion cracking dynamics by dynamic electrochemical impedance spectroscopy

Influence of the Ni‐Content on the Cathodic an Corrosive Hydrogen Induced Cracking Behaviour of Austenitic Alloys

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