Effects of testing variables on stress corrosion cracking susceptibility of Al 2024-T351

Lee, Hyunjung; Kim, Youngjoo; Jeong, Yooin; Kim, Sangshik

doi:10.1016/j.corsci.2011.09.021

Cited by 43 publications

(10 citation statements)

References 30 publications

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“…SSRT experiments by Haruna and Shibata on cylindrical 316L stainless steel exposed to aqueous NaCl solutions in which the tests were interrupted and then cross-sectioned for evaluation revealed crack initiation and propagation prior to failure [38]. Lee et al speculated that the fracture of AA2024-T351 SSRT specimens exposed to aqueous chloride solutions resulted from the formation of pits, which enabled the initiation and propagation of cracks, leading to final failure [31]. Lastly, modeling of SSRT experiments by Garud explicitly includes the formation and propagation of 'microcracks' as the means by which the net-section load-carrying capacity is diminished [39].…”

Section: Evidence For the Onset Of Sub-critical Cracking During Ssrt mentioning

confidence: 99%

“…Second, depending on the environment of interest, SSRT metrics have been shown to be strongly dependent on testing variables and specimen geometry. In particular, SSRT results have been found to be affected by the applied displacement rate [30][31][32], the specimen surface finish [26,28,33], and the specimen diameter [30]. For example, McIntyre noted that a slight change in strain rate from 4.0 × 10 −6 to 3.5 × 10 −6 s −1 resulted in a 14% decrease in time to failure for testing in a simulated sour gas environment (alloy not specified) [30].…”

Section: Introductionmentioning

confidence: 99%

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On the suitability of slow strain rate tensile testing for assessing hydrogen embrittlement susceptibility

et al. 2020

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The onset of sub-critical crack growth during slow strain rate tensile testing (SSRT) is assessed through a combined experimental and modeling approach. A systematic comparison of the extent of intergranular fracture and expected hydrogen ingress suggests that hydrogen diffusion alone is insufficient to explain the intergranular fracture depths observed after SSRT experiments in a Ni-Cu superalloy. Simulations of these experiments using a new phase field formulation indicate that crack initiation occurs as low as 40% of the time to failure. The implications of such sub-critical crack growth on the validity and interpretation of SSRT metrics are then explored.

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Section: Evidence For the Onset Of Sub-critical Cracking During Ssrt mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the suitability of slow strain rate tensile testing for assessing hydrogen embrittlement susceptibility

et al. 2020

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“…Burleigh [14] reviewed the earlier research on aluminum alloy SCC and believed that anodic dissolution type SCC mainly occurs in Al-Cu-Mg alloy, while hydrogen induced cracking type SCC exists in Al-Zn-Mg-Cu alloy. In contrast, a great number of later researches argued that the synergy mechanism of the two types can better explain the essence of high strength Aluminum Alloy SCC [8][9][10]. In this paper, the addition of significantly promoted the stress corrosion behavior of the two kinds of high strength aluminum alloy.…”

Section: ． Analysis Of Experimental Resultsmentioning

confidence: 76%

“…We believe that this is because the natural environment corrosion test generally needs a long time, but the completed test is mainly concerned with the weight loss and morphology change for the corrosion. It is difficult to carry out in-depth study of its stress corrosion behavior.Recently, researchers usually use the tensile test in the solution for the study of stress corrosion of aluminum alloy [8][9][10]. But in the marine atmosphere, the essence of aluminum alloy corrosion is the electricity chemical process in unsteady thin electrolytes layer whose thickness, shape and distribution will be of cyclical changes due to temperature, humidity, light, rainfall and other factors with alternating effects.…”

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confidence: 99%

Influence of Contaminated NH3 on Stress Corrosion Behavior of 7075 High Strength Aluminum Alloy in Marine Atmosphere Environment

Yan¹

2018

Proceedings of the 2018 3rd International Conference on Automation, Mechanical Control and Computational Engineering (AMCCE 201

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The addition of NH 4 + in NaCl which could simulate the marine atmosphere environment contaminated NH 3 accelerates the corrosion process of 7075 high strength aluminum alloys. The acceleration effect is mainly promoted by the reaction process of aluminum alloy cathode. This is due to the fact that NH 4 + leads to the acidification of solution to promote the occurrence of cathodic reaction. The addition of NH 4 + increases the stress corrosion susceptibility of the 7075, and the sensitivity of stress corrosion increases with the increase of NH 4 + concentration. The reason is that the acceleration of the cathodic reaction process caused by NH 4 + promotes the precipitation of hydrogen and the diffusion in the aluminum alloy. At the same time, the corrosion effect of the aluminum alloy also changes the mechanical properties of the aluminum alloy, and the stress corrosion sensitivity of the high strength aluminum alloy increase. 1． Introduction7075 high-strength aluminum alloy has been widely used in the aviation industry due to the high strength and low density. However, in the marine atmospheric environment, high-strength aluminum alloy prone to pitting, intergranular corrosion and peel corrosion, or even stress corrosion cracking. It is a serious threat to the safety of equipment services made of 7075.At present on the corrosion of aluminum alloy in the natural environment has been carried out a certain study [1][2][3][4][5][6][7]. Researchers found traces of pitting [1][2][3][4][5], intergranular corrosion [3,6,7], peel corrosion [6,7] and stress corrosion cracking [3]. Sun et al. [6] studied the corrosion behavior of 7075 aluminum alloys in rural, marine and industrial environments atmosphere, and found that the aluminum alloy was significantly eroded with peel corrosion and resulted in a significant decrease in mechanical properties. Based on the literature resources, we found that the study of stress corrosion of high strength aluminum alloys in the atmosphere is still small. We believe that this is because the natural environment corrosion test generally needs a long time, but the completed test is mainly concerned with the weight loss and morphology change for the corrosion. It is difficult to carry out in-depth study of its stress corrosion behavior.Recently, researchers usually use the tensile test in the solution for the study of stress corrosion of aluminum alloy [8][9][10]. But in the marine atmosphere, the essence of aluminum alloy corrosion is the electricity chemical process in unsteady thin electrolytes layer whose thickness, shape and distribution will be of cyclical changes due to temperature, humidity, light, rainfall and other factors with alternating effects. The unsteady characteristics of the thin film are mainly manifested in the dynamic and dispersive, dynamic can lead to thin film thickness from several molecular layer to several millimeters change, and the dispersion leads to material, liquid film and gas composition Of the "gas / liquid / solid" three-phase interface area i...

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“…However, for a high strength Al-Cu-Mg alloy, PFZ has the lowest potential than the CuAl 2 and α matrix. The inhibition of the formation of PFZ is the primary way to improve the resistance of the Al-Cu-Mg alloy to SCC [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Natural Aging on the Stress Corrosion Cracking Behavior of A201-T7 Aluminum Alloy

et al. 2020

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The effect of natural aging on the stress corrosion cracking (SCC) of A201-T7 alloy was investigated by the slow strain rate testing (SSRT), transmission electron microscopy (TEM), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), conductivity, and polarization testing. The results indicated that natural aging could significantly improve the resistance of the alloys to SCC. The ductility loss rate of the unaged alloy was 28%, while the rates for the 24 h and 96 h aged alloys were both 5%. The conductivity of the as-quenched alloy was 30.54 (%IACS), and the conductivity of the 24 h and 96 h aged alloys were decreased to 28.85 and 28.65. After T7 tempering, the conductivity of the unaged, 24 h, and 96 h aged alloys were increased to 32.54 (%IACS), 32.52 and 32.45. Besides, the enthalpy change of the 24 h and 96 h aged alloys increased by 36% and 37% compared to the unaged alloy. The clustering of the solute atoms would evidently be enhanced with the increasing time of natural aging. Natural aging after quenching is essential to improve the alloy’s resistance to SCC. It might be due to the prevention of the formation of the precipitation free zone (PFZ) after T7 tempering.

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Effects of testing variables on stress corrosion cracking susceptibility of Al 2024-T351

Cited by 43 publications

References 30 publications

On the suitability of slow strain rate tensile testing for assessing hydrogen embrittlement susceptibility

On the suitability of slow strain rate tensile testing for assessing hydrogen embrittlement susceptibility

Influence of Contaminated NH3 on Stress Corrosion Behavior of 7075 High Strength Aluminum Alloy in Marine Atmosphere Environment

Effect of Natural Aging on the Stress Corrosion Cracking Behavior of A201-T7 Aluminum Alloy

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