Role of Microstructure in Susceptibility of X70 Pipeline Steel to Hydrogen Embrittlement

D. Hejazi; A.J. Haq; N. Yazdipour; D.P. Dunne; Frank J. Barbaro; Elena V. Pereloma

doi:10.4028/www.scientific.net/MSF.654-656.162

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HomeMaterials Science ForumMaterials Science Forum Vols. 654-656Role of Microstructure in Susceptibility of X70...

Role of Microstructure in Susceptibility of X70 Pipeline Steel to Hydrogen Embrittlement

Abstract:

In order to investigate the susceptibility of steels to hydrogen embrittlement as a function of their microstructure X70 steel was chosen in different conditions: normalized transfer bar, as-received hot rolled strip and heat affected zone (HAZ). Notched and fatigue pre-cracked samples were subjected to electrochemical hydrogen charging to achieve 2 ppm hydrogen content. Three point bend tests were conducted on as-received and hydrogen charged samples. The results showed that HAZ samples are more susceptible to hydrogen embrittlement than the others. This was supported by fracture surface observations.

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Materials Science Forum (Volumes 654-656)

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162-165

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.654-656.162

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June 2010

Authors:

D. Hejazi, A.J. Haq, N. Yazdipour, D.P. Dunne, Frank J. Barbaro, Elena V. Pereloma

Keywords:

Fractography, Fracture Toughness, Hydrogen Charging, Microstructure, Pipeline Steel

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