Journal
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
Volume 199, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijpvp.2022.104762
Keywords
Pipeline steel; PWHT; Inter -critical temperature; EBSD; Hydrogen induced cracking; Crystallographic texture
Funding
- Natural Science and Engineering Research Council of Canada (NSERC) [470033]
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Three different heat treatments were applied on X70 pipeline steel to study the effect of hydrogen ingress on the degradation of mechanical properties. The results showed a reduction in elongation and toughness of all hydrogen-charged samples, as well as a strong correlation between hardness and hydrogen embrittlement susceptibility. The treatments that resulted in the formation of cementite precipitates within the ferritic matrix showed improved resistance to hydrogen embrittlement.
Three different heat treatments were applied on X70 pipeline steel: below transformation temperature (X70-720), in the intercritical temperature range (X70-780), and in the intercritical temperature range + tempering (X70-780/720). Then, cathodic hydrogen charging was conducted on these heat-treated samples to study the effect of hydrogen ingress on the degradation of their mechanical properties in relation to their microstructural characteristics. The mechanical test results showed a reduction in elongation and toughness of all hydrogen -charged samples, as well as a strong correlation between hardness and hydrogen embrittlement (HE) suscepti-bility. However, the treatments, which resulted in the formation of cementite precipitates within the ferritic matrix (X70-780/720), showed improved resistance to HE. Also, the crystallographic texture analysis revealed that a high volume fraction ratio of {111} || ND to {100}< 011 > contributed to the significant improvement of HE resistance in X70-780/720, while a low volume fraction ratio resulted in the least HE resistance in X70-720 specimens.
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