On statistical properties of the estimations of fractal dimensions of the corrosion fracture surfaces of low-alloy high-strength steel

Krupin, Yu. A.; Kiselev, I.K.

doi:10.1016/0956-716x(90)90495-3

Cited by 6 publications

(2 citation statements)

References 5 publications

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“…The branching features were not dependent on NaCI concentration in distilled water and were observed in specimens subjected to constant load as well as linearly increasing load conditions. Crack branching has been previously observed in high strength steels subjected to stress corrosion cracking [30,67,[68][69][70]. It should be mentioned that the propagation mechanism described above ( Fig.…”

Section: Microscopic Observations and Crack Morphologymentioning

confidence: 98%

Environmental Effects on the Incubation Time Characteristics in Stress-Corrosion Cracking

Jiang¹

2011

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions searching data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information Send comments regarding this burden estimate or any other aspect of this collection of information including suggestions for reducing this burden to Washington Headquarters Service, Directorate SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)Office of Naval Research, Code-332 875 North Randolph Street, Suite 1425, Room-629 Arlington, VA 22203 SPONSOR/MONITOR'S ACRONYM(S)11. SPONSORING/MONITORING AGENCY REPORT NUMBER DISTRIBUTION AVAILABILITY STATEMENTApproved for Public Release; Distribution is Unlimited SUPPLEMENTARY NOTES ABSTRACTStress corrosion cracking (SCC) experiments were conducted on 4340 steel in NaCI aqueous solutions of different concentrations. Despite the differences in controlling conditions, the experiments yielded similar results for the threshold stress intensity factor and the plateau velocity in the 3.5 wt% NaCI solution. Dependence of the plateau velocity on the NaCI concentration was observed. SCC experiments on 7075-T651 Al alloy were conducted in chromate-inhibited, acidic NaCI aqueous solutions with different concentrations. The SCC process consists of three stages: incubation, transient crack growth, and stable crack growth. The incubation time is highly dependent on the load level. For a given NaCI concentration, the relationship between the applied load and the incubation time follows a power law function. A NaCI concentration of 0.1% results in the shortest incubation time and the fastest plateau velocity. SUBJECT TERMS4340 steel, 7075-T651 aluminum alloy, incubation time, stress corrosion. 775-784-4510Standard Form 298 (Rev. 8-98)Prescribed by ANSI-Std Z39-18 ENVIRONMENTAL EFFECTS ON THE INCUBATION TIME CHARACTERISTICS IN STRESS-CORROSION CRACKING SUMMARYThe objectives of the research are to (i) explore the incubation time characteristics in stress-corrosion cracking with the influence of the anodic dissolution cracking and hydrogen assisted cracking in different environments and at various applied stresses, and, (ii) quantify the incubation time with respect to the driving force considering the environmental effect.Extensive stress corrosion cracking (SCC) experiments were conducted on 7075-T651 aluminum alloy and the high strength martensitic steel AISI 4340 (yield stress = 1503 MPa) in sodium chloride (NaCI) aqueous solutions of different concentrations. The experiments on AISI 4340 were conducted under the controls of constant load, constant crack opening displacement (COD), constant loading rate, and constant COD rate. Despite the differences in controlling conditions, the experiments yielded similar results for the threshold stress intensity factor and the plateau velocity in the 3.5 wt% NaCI solution. Dependence of the plateau velocity on the NaCI concentration was observed, while the values of the ...

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Section: Microscopic Observations and Crack Morphologymentioning

confidence: 98%

Environmental Effects on the Incubation Time Characteristics in Stress-Corrosion Cracking

Jiang¹

2011

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“…Crack branching has been previously observed in highstrength steels subjected to stress corrosion cracking. [30,[67][68][69][70] It should be mentioned that the propagation mechanism described earlier ( Figure 12) can be considered microscopic branching because the main crack essentially consists of two propagating branches forming the ''cells'' and separated by 30 lm vertically. The formation of such ''cells'' on the microscopic level, however, does not influence the overall plateau velocity of SCC.…”

Section: Microscopic Observations and Crack Morphologymentioning

confidence: 99%

Stress-Corrosion Cracking of AISI 4340 Steel in Aqueous Environments

Kalnaus

Zhang

Jiang

2010

Metall Mater Trans A

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Stress corrosion cracking of the high-strength martensitic steel AISI 4340 (yield stress = 1503 MPa) in NaCl aqueous solutions of different concentrations was studied experimentally using compact tension specimens in free corroding conditions. The experiments were conducted under the controls of constant load, constant crack opening displacement (COD), constant loading rate, and constant COD rate. Despite the differences in controlling conditions, the experiments yielded similar results for the threshold stress intensity factor and the plateau velocity in the 3.5 wt pct NaCl solution. Dependence of the plateau velocity on the NaCl concentration was observed, whereas the values of the threshold stress intensity factors seem to be independent of the NaCl concentration in distilled water.

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On direction-invariance of fractal dimension on a surface

Hall

Davies

1995

Appl. Phys. A

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On statistical properties of the estimations of fractal dimensions of the corrosion fracture surfaces of low-alloy high-strength steel

Cited by 6 publications

References 5 publications

Environmental Effects on the Incubation Time Characteristics in Stress-Corrosion Cracking

Environmental Effects on the Incubation Time Characteristics in Stress-Corrosion Cracking

Stress-Corrosion Cracking of AISI 4340 Steel in Aqueous Environments

On direction-invariance of fractal dimension on a surface

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