Stress corrosion cracking and fatigue crack growth of an API 5L X70 welded joint in an ethanol environment

Giorgetti, Vinícius; Santos, Elielson A. dos; Marcomini, José Benedito; Sordi, Vitor Luiz

doi:10.1016/j.ijpvp.2019.01.006

Cited by 32 publications

(21 citation statements)

References 20 publications

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“…This is caused by the slow cooling time of the region due to the successive filler weld passes. An information about the microstructure of MMA welded joint (API X70 steel) 9 mm in thickness was provided also by Digheche et al [15]. They revealed that the microstructure of the HAZ shows fine ferrite grains with some elongated entities.…”

Section: Literature Surveymentioning

confidence: 95%

“…Many attempts have been made to analyse the microstructure of API X70 steel welded joints. However, there is a lack of a more systematic metallographic investigations comprising the base material, HAZ as well as weld metal with relation to mechanical properties [10][11][12][13][14][15][16][17][18][19][20]. Ghomashchi and co-workers [10] revealed that the microstructure of arc girth welded joint of the API X70 steel produced by the manual metal arc (MMA) welding with E6010 cellulosic electrodes are composed of Widmanstätten and acicular ferrites, lamellar pearlite and aggregated ferrite-carbide.…”

Section: Literature Surveymentioning

confidence: 99%

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A comprehensive study on the microstructure and mechanical properties of arc girth welded joints of spiral welded high strength API X70 steel pipe

Węglowski

Dymek

Kopyściański

et al. 2020

Archiv.Civ.Mech.Eng

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In the paper, the effect of welding technology on the microstructure and mechanical properties of girth welded joints was presented. Metallographic examinations based on light microscopy and SEM were conducted on girth welded joints of API X70 steel pipe. Research has shown that microstructure of the heat-affected zone (HAZ) of MMA girth welded joints is not homogeneous and depends on the thermal history of each area during the welding process. Near the fusion line the zone is coarse, and further away there is a fine-grained zone. In the area of root passes the microstructure consists of recrystallized ferrite grains unlike to cap passes where the fine bainitic microstructure can be observed. In the case of MAG girth welded joints, the weld microstructure consists of primary austenite grains. The primary austenite boundaries serve as nucleation sites of ferrite. The microstructure of the HAZ varies continuously from a coarse-to fine-grained microstructure of the base material. The results of mechanical properties of girth welded joints are also presented. The hardness and strength of arc welded joints depend on welding filler materials as well as welding technology. The results of hardness distribution of MMA and MAG girth welded joints confirmed the results of microstructural evaluation.

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Section: Literature Surveymentioning

confidence: 95%

Section: Literature Surveymentioning

confidence: 99%

A comprehensive study on the microstructure and mechanical properties of arc girth welded joints of spiral welded high strength API X70 steel pipe

Węglowski

Dymek

Kopyściański

et al. 2020

Archiv.Civ.Mech.Eng

View full text Add to dashboard Cite

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“…Fu et al 10 studied the stress corrosion cracking behaviour of cold rolled SUS301L stainless steel laser‐arc hybrid welded joints in 3.5‐wt% NaCl solution and indicated that the stress corrosion cracking susceptibility index of welded joints was much lower than that of the base material. Giorgetti et al 11 studied the mechanical behaviour of an API 5L X70 welded joint in an ethanol environment. When in contact with ethanol, the test specimens exhibited a notable loss in ductility, and this effect was more obvious in the HAZ of the welded specimens.…”

Section: Introductionmentioning

confidence: 99%

Effect of corrosion on the fatigue behaviour of butt welds of G20Mn5QT cast steel and Q345D hot rolled steel in 3.5‐wt% NaCl solution

Han

Wang

Lu³

2020

Fatigue Fract Eng Mat Struct

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Corrosion fatigue experiments are carried out on butt welds of G20Mn5QT cast steel and Q345D hot rolled steel in simulated seawater. The cyclic stress versus number of cycles to failure (S-N) curve was fitted. The mechanism of crack nucleation at different fracture locations and at different stress levels is analysed. The results show that compared with the S-N curve of laboratory air, for the S-N curve of simulated seawater, the number of fatigue failure cycles is significantly reduced when the maximum cyclic stress is less than 190 MPa. At higher stress levels, stress concentrations caused by internal defects near the surface of the weld zone and the heat-affected zone of G20Mn5QT cast steel cause crack nucleation. At lower stress levels, the main reason for crack nucleation is the stress concentration caused by corrosion pitting. However, there are no obvious internal defects in the heat-affected zone of the Q345D steel, and corrosion pitting is the main cause of crack nucleation. The stress concentrations caused by pitting lead to crack nucleation. K E Y W O R D S butt weld of cast steel (G20Mn5QT) and Q345D hot rolled steel, corrosion fatigue, fractographic characterization, mechanism of crack nucleation, S-N curve

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“…The high SCC and local corrosion resistance of DSSs in a corrosion environment is benefit from the balance of two phases and homogeneous microstructure. HAZs with degraded microstructures are certainly very susceptible to local corrosion and SCC (Ref [18][19][20], and improved understanding of the influence of microstructures on SCC behavior is desperately needed. In this paper, we focused on the SCC behaviors of DSSs with different microstructures acquired by heat treatments in simulated sea environments (the shallow sea and deep sea).…”

Section: Introductionmentioning

confidence: 99%

Stress Corrosion Cracking of 2205 Duplex Stainless Steel with Simulated Welding Microstructures in Simulated Sea Environment at Different Depths

Song

Liu

et al. 2020

J. of Materi Eng and Perform

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The stress corrosion cracking (SCC) of 2205 duplex stainless steels (DSSs) with different microstructures in simulated sea environments were studied by electrochemical measurements, electron backscattered diffraction and slow strain rate tensile tests. Heat treatments were used to obtain different microstructures. The DSSs were held at 1350 and 850°C for 30 min and then quenched in the water. The results showed that the DSSs had a higher SCC susceptibility in simulated shallow sea environment than in the simulated deepsea environment. Electrochemical mechanism of the SCC process was controlled by environment factors (temperature, hydrostatic pressure and dissolved oxygen content). The mechanisms of SCC changed from anodic dissolution in the simulated shallow sea environment to hydrogen embrittlement in the simulated deep-sea environment. Moreover, the quenched DSSs, especially the steel held at 850°C, were more vulnerable to SCC than as-received steel in the simulated sea environment due to the deterioration of the microstructure.

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Stress corrosion cracking and fatigue crack growth of an API 5L X70 welded joint in an ethanol environment

Cited by 32 publications

References 20 publications

A comprehensive study on the microstructure and mechanical properties of arc girth welded joints of spiral welded high strength API X70 steel pipe

A comprehensive study on the microstructure and mechanical properties of arc girth welded joints of spiral welded high strength API X70 steel pipe

Effect of corrosion on the fatigue behaviour of butt welds of G20Mn5QT cast steel and Q345D hot rolled steel in 3.5‐wt% NaCl solution

Stress Corrosion Cracking of 2205 Duplex Stainless Steel with Simulated Welding Microstructures in Simulated Sea Environment at Different Depths

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