Effect of microstructure on the hydrogen trapping efficiency and hydrogen induced cracking of linepipe steel

Park, Gyu Tae; Koh, Sung Ung; Jung, Hwan Gyo; Kim, Kyoo Young

doi:10.1016/j.corsci.2008.03.007

Cited by 345 publications

(134 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…When the samples are charged with hydrogen, the bainitic lath boundaries can trap large amounts of hydrogen [15]. Arafin and Szpunar [51] have observed extensive cracking in bainitic microstuctures and suggest that that the accumulation of significant amount of hydrogen at the bainitic lath boundaries can eventually lead to the separation of these interfaces and result in cracking when hydrogen concentration in these areas increases beyond a critical value.…”

Section: Effect Of Microstructurementioning

confidence: 99%

“…In the thermo-mechanically controlled processing (TMCP) of pipeline steels, different combinations of microstructures can be obtained, such as ferrite-pearlite, bainitic ferrite, bainitic ferritebainite, polygonal ferrite-bainitic ferrite etc [18][19]. It has been reported that the efficiency of trapping tends to increase in the following order: small second phase particles, coarse pearlite, fine pearlite, bainite, martensite and acicular ferrite [15,20].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of manganese content and microstructure on the susceptibility of X70 pipeline steel to hydrogen cracking

Hejazi

Haq

Yazdipour

et al. 2012

Materials Science and Engineering: A

117

View full text Add to dashboard Cite

The influence of composition and microstructure on susceptibility to hydrogen induced cracking (HIC) was investigated in high strength pipeline steels, with Mn contents of 1.2% (standard, X70), and 0.5% (medium, MX70). The HIC resistance of the simulated coarse grained heat affected zone microstructures and normalized X70 transfer bar was also investigated. Notched and fatigue pre-cracked samples were charged with hydrogen prior to three point bend tests. The conditional fracture toughness JQ was determined. The results are discussed in relation to grain size, microstructure, composition and the type and distribution of non-metallic inclusions and precipitates. Published as "Effect of manganese content and microstructure on the susceptibility of X70 pipeline steel to hydrogen cracking" AbstractHydrogen, even in very low concentrations, can diffuse to regions of high stress concentration resulting in a degradation of mechanical properties. However, the transport of hydrogen depends on the interaction between hydrogen atoms and microstructural traps which, in turn, is related to microstructure. The influence of composition and microstructure on susceptibility to hydrogen embrittlement was investigated by selecting pipeline steels with different Mn contents, i.e., standard Mn (X70) and medium Mn (MX70) strips. The HAZ (heat affected zone) microstructures of these strips as well as a normlised transfer bar (TB) were also investigated. HAZ simulations were conducted using Gleeble thermo-mechanical machine to simulate a thermal cycle typical of inservice repairs. Notched and fatigue pre-cracked samples were subjected to electrochemical hydrogen charging using a solution of H 2 SO 4 and NaAsO 2 to achieve 2 and 4 ppm hydrogen content. Three point bend tests were conducted on as-received and hydrogen-charged samples. The X70 strip exhibited a higher J Q than the MX70 strip before and after charging, whereas the TB displayed the lowest J Q . The fracture performance of both steels deteriorated almost linearly with an increase in the hydrogen content. Because of their coarser prior austenite grain sizes and the presence of relatively hard bainitic-ferrite structure with martensite/austenite islands, the simulated HAZ microstructures of the two steels demonstrated significantly lower fracture resistance both with and without hydrogen. The results obtained were compared and discussed in relation to the grain size, microstructure, composition and the type and distribution of precipitates in the samples.

show abstract

Section: Effect Of Microstructurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of manganese content and microstructure on the susceptibility of X70 pipeline steel to hydrogen cracking

Hejazi

Haq

Yazdipour

et al. 2012

Materials Science and Engineering: A

117

View full text Add to dashboard Cite

show abstract

“…It is well known that H 2 S originating from different processes in the oil and gas industry can accelerate the anodic and cathodic reactions of the corrosion process: iron dissolution and hydrogen evolution reaction, respectively [1][2][3][4][5][6][7][8][9][10] . Studies focusing on improving the resistance of pipeline steels to H 2 S corrosion to avoid failures during oil and gas transport have been reported [9][10][11][12][13][14] . In Brazil, the manufacture and use of high-strength low-alloy steel pipelines have been implemented in recent decades; these pipelines are nationally produced using thermomechanical controlled processing (TMCP) without accelerated cooling and fabricated using the UOE process (pressing a U-shaped pipe between two semi-circular dies to form an O-shaped pipe, then welding the pipe closed and circumferentially expanding it to obtain a highly circular shape) for the conduction of liquid and gaseous hydrocarbons.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Evaluation of SAW Welded API 5L X-80 Joints in H2S-Containing Solution

2015

View full text Add to dashboard Cite

“…An alternative effect of LAGBs arises from their propensity to act as reversible hydrogen traps [28][29][30]. In this regard, the relatively high fraction of LAGBs (Figure 8(b)) in the BF (simulated CGHAZ) microstructure is likely to contribute to the suppression of blistering/cracking in this case.…”

Section: Electron Back-scattering Diffraction Analysismentioning

confidence: 99%

Investigation of the effect of electrolytic hydrogen charging of X70 steel: II. Microstructural and crystallographic analyses of the formation of hydrogen induced cracks and blisters

Saleh

Hejazi

Gazder

et al. 2016

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

Pereloma, E. V. (2016). Investigation of the effect of electrolytic hydrogen charging of X70 steel: II. Microstructural and crystallographic analyses of the formation of hydrogen induced cracks and blisters. International Journal of Hydrogen Energy, 41 (28), 12424-12435. Investigation of the effect of electrolytic hydrogen charging of X70 steel: II. Microstructural and crystallographic analyses of the formation of hydrogen induced cracks and blisters AbstractHydrogen-induced cold cracking and blistering in hydrogen-charged X70 steel was found to be highly dependent on microstructure, with the banded ferrite-pearlite microstructure of hot rolled strip showing a higher susceptibility than other microstructures produced by different thermal-mechanical routes. Although crack initiation was particularly sensitive to microstructure, crack growth occurred largely parallel to the rolling plane, at least at a macroscopic level, for all of the microstructures investigated. The crack plane was associated with structural anisotropy arising from processing by rolling and was not found to be related to a preferred grain orientation. At a microstructural level, crack propagation was mostly transgranular and occurred dominantly along slip planes of the ferrite grains. Cracks were initiated at strong traps in the microstructure when the hydrogen and local stress concentrations reached critical levels for hydrogeninduced fracture. The main initiation sites were coarse inclusions, mainly oxides, and ferrite-pearlite interfaces. Keywords: X70 pipeline steel, electrolytic hydrogen charging, hydrogen-induced cold cracking (HICC), effect of microstructure, crystallography of cracking, effect of grain texture.

show abstract

Effect of microstructure on the hydrogen trapping efficiency and hydrogen induced cracking of linepipe steel

Cited by 345 publications

References 16 publications

Effect of manganese content and microstructure on the susceptibility of X70 pipeline steel to hydrogen cracking

Effect of manganese content and microstructure on the susceptibility of X70 pipeline steel to hydrogen cracking

Corrosion Evaluation of SAW Welded API 5L X-80 Joints in H2S-Containing Solution

Investigation of the effect of electrolytic hydrogen charging of X70 steel: II. Microstructural and crystallographic analyses of the formation of hydrogen induced cracks and blisters

Contact Info

Product

Resources

About