Investigation of Stress Corrosion Cracking in Magnesium Alloys by Quantitative Fractography Methods

Sozańska, M.; Mościcki, Adrian; Chmiela, Bartosz

doi:10.1515/amm-2017-0082

Cited by 8 publications

(8 citation statements)

References 10 publications

(13 reference statements)

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“…The authors of this publication have used both techniques-quantitative description of the profile fracture [7,8] or a fracture surface [9,10,36]. However, the most important thing, regardless of the chosen research technique, is the selection of detail of surface fracture for the quantitative description, e.g., a fraction of the ductile fracture, cracks.…”

Section: Qualitative and Quantitative Evaluation Of The Fracture Surface After The Ssr Tests Using The Oryginaly Developed Quantitative Fmentioning

confidence: 99%

The Characterization of Stress Corrosion Cracking in the AE44 Magnesium Casting Alloy Using Quantitative Fractography Methods

Sozańska

Mościcki²,

Czujko

2019

Materials

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In this work an assessment of the susceptibility of the AE44 magnesium alloy to stress corrosion cracking in a 0.1M Na2SO4 environment is presented. The basic assumed criterion for assessing the alloy behavior under complex mechanical and corrosive loads is deterioration in mechanical properties (elongation, reduction in area, tensile strength and time to failure). The AE44 magnesium alloy was subjected to the slow strain rate test (SSR) in air and in a corrosive environment under open circuit potential (OCP) conditions. In each variant, the content of hydrogen in the alloy was determined. The obtained fractures were subjected to a quantitative evaluation by original fractography methods. It was found that under stress corrosion cracking (SCC) conditions and in the presence of hydrogen the mechanical properties of AE44 deteriorated. The change in the mechanical properties under SCC conditions in a corrosive environment was accompanied by the presence of numerous cracks, both on fracture surfaces and in the alloy microstructure. The developed method for the quantitative evaluation of cracks on the fracture surface turned out to be a more sensitive method, enabling the assessment of the susceptibility of AE44 under complex mechanical and corrosive loads in comparison with deterioration in mechanical properties. Mechanical tests showed a decrease in properties after SSRT tests in corrosive environments (UTS ≈ 153 MPa, ε = 11.2%, Z = 4.0%) compared to the properties after air tests (UTS ≈ 166 MPa, ε = 11.9%, Z = 7.8%) but it was not as visible as the results of quantitative assessment of cracks at fractures (number of cracks, length of cracks): after tests in corrosive environment (900; 21.3 μm), after tests in air (141; 34.5 μm). These results indicate that the proposed new proprietary test methodology can be used to quantify the SSC phenomenon in cases of slight changes in mechanical properties after SSRT tests in a corrosive environment in relation to the test results in air.

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Section: Qualitative and Quantitative Evaluation Of The Fracture Surface After The Ssr Tests Using The Oryginaly Developed Quantitative Fmentioning

confidence: 99%

The Characterization of Stress Corrosion Cracking in the AE44 Magnesium Casting Alloy Using Quantitative Fractography Methods

Sozańska

Mościcki²,

Czujko

2019

Materials

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“…The researchers stated that the intergranular stress corrosion crack (IGSCC) and transgranular stress corrosion crack (TGSCC) fracture mechanisms were observed in Mg alloys and they were discussed the reasons [3,[8][9][10]. Sozanska et al investigated SCC of WE43 magnesium alloy by quantitative fractography methods [11]. Winzer et al [7] investigated AZ91 Mg alloy behavior of SCC in aqueous media.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Stress Corrosion Cracking Behaviour of Mg-Al-Zn Alloys in Different pH Environments by SSRT Method

Çatar

Altun

2019

Open Chemistry

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In this study, stress corrosion behaviors of AZ31, AZ61 and AZ91 Mg alloys which contain different amounts of Al were investigated under acidic, basic and neutral environments having chloride ions using Slow Strain Rate Test (SSRT) method. Stress corrosion indexes (ISCC), ultimate tensile strength (UTS) and elongation of AZ31, AZ61, and AZ91 Mg alloys were determined and compared. Slow strain rate test showed that three Mg alloys in basic environments were the least stress corrosion susceptible, while the most stress corrosion susceptible occurred in acidic environments. Also, it has been shown that the stress corrosion indexes of AZ91 Mg alloys are less than AZ31 and AZ61 Mg alloys in all environments. UTS and elongation of AZ61 Mg alloys were higher than those of AZ31 and AZ91 in all media. The fracture of surface images also examined in the scanning electron microscope (SEM) and both intergranular stress corrosion cracking (IGSCC) and transgranular stress corrosion cracking (TGSCC) were observed in all three alloys.

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“…Hydrogen degradation takes different forms, depending on the type of material, environment, temperature and mechanical loads. In metallic materials it may result in delayed cracking, deterioration of plastic properties [3,4,5], decarbonisation, delamination, or hydrogen blistering filled with molecular hydrogen [6,7,8].…”

Section: Introductionmentioning

confidence: 99%

“…To assess the degree of hydrogen degradation, next to the basic mechanical criterion based on degradation of mechanical properties, structural criteria are also used, in which the key role is played by the changes caused by the presence of hydrogen in the microstructure and on the surface of the fractures. Obtained as a result of the study, stress-strain curves (SSRT, static tensile test) in conjunction with the fractures analysis by the quantitative fractography method lead to a more complete characteristics of the phenomenon of degradation of the alloys in corrosive environments [3]. Different concentrations of hydrogen not only reflect on the surface of the fractures after a static tensile test (change in the nature the fractures) [16][17], but also in the deterioration of the corrosive properties [6,[18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Comparison of resistance to damage of unalloyed carbon steels under the influence of hydrogen

Pietkun-Greber

2018

MATEC Web Conf.

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One of the most commonly used construction material in industry is unalloyed steel S235 and S355. These types of steel are used for construction of ships, bridges, coastal construction, welded tanks, and in buildings. Due to the operating conditions, these types of steel may undergo hydrogen degradation in the process of manufacturing of welded structures or when operating the structures. This paper presents the results of study into resistance of selected types of non-alloy structural steels to hydrogen degradation. Tests were carried out to determine changes in mechanical properties in the static trials of stretching without hydrogen, and after saturation with hydrogen. Parallel fractographic and electrochemical studies were carried out. Hydrogen saturation was carried out at the time from 3. up to 24. hours in a solution of 0.1N H2SO4 with the addition of 2 mg/dm3 arsenic oxide (III) at an electric current density of 20 mA/cm2. The results of the tests have shown that the impact of hydrogen on the tested steels S235JR and S355J2 leads to a significant deterioration in their mechanical and electrochemical properties. At comparable concentrations of hydrogen, steel S235JR is less susceptible to hydrogen degradation and has greater corrosive resistance measured in 3% NaCl solution, in comparison with steel S355J2.

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Investigation of Stress Corrosion Cracking in Magnesium Alloys by Quantitative Fractography Methods

Cited by 8 publications

References 10 publications

The Characterization of Stress Corrosion Cracking in the AE44 Magnesium Casting Alloy Using Quantitative Fractography Methods

The Characterization of Stress Corrosion Cracking in the AE44 Magnesium Casting Alloy Using Quantitative Fractography Methods

Investigation of Stress Corrosion Cracking Behaviour of Mg-Al-Zn Alloys in Different pH Environments by SSRT Method

Comparison of resistance to damage of unalloyed carbon steels under the influence of hydrogen

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