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Effect of gaseous hydrogen charging on the tensile properties of standard and medium Mn X70 pipeline steels

Journal Article


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Abstract


  • The tensile properties of two X70 steels with high (1.14 wt-%) and medium (0.5 wt-%) Mn contents

    have been investigated by testing at 25°C of tubular specimens charged with an internal gas

    pressure of 10 MPa of hydrogen or argon. The hydrogen-charged samples were additionally

    tested at 50 and 100°C. Tensile testing showed that the equiaxed ferrite–pearlite microstructure

    of higher Mn steel was most sensitive to hydrogen embrittlement and that the banded ferrite–

    pearlite microstructure of the higher Mn strip was more susceptible to hydrogen embrittlement

    than the medium Mn strip. The more highly banded ferrite–pearlite microstructure in the higher

    Mn steel provided numerous sites for concentration of hydrogen to levels that promoted crack

    initiation and growth. Test temperatures up to 100°C reduced the yield and tensile strengths,

    increased the total elongation and decreased the extent of hydrogen embrittlement because of

    enhanced dislocation mobility and less effective hydrogen trapping.

Publication Date


  • 2016

Citation


  • Hejazi, D., Calka, A., Dunne, D. & Pereloma, E. (2016). Effect of gaseous hydrogen charging on the tensile properties of standard and medium Mn X70 pipeline steels. Materials Science and Technology, 32 (7), 675-683.

Scopus Eid


  • 2-s2.0-84981293937

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=6613&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/5585

Number Of Pages


  • 8

Start Page


  • 675

End Page


  • 683

Volume


  • 32

Issue


  • 7

Abstract


  • The tensile properties of two X70 steels with high (1.14 wt-%) and medium (0.5 wt-%) Mn contents

    have been investigated by testing at 25°C of tubular specimens charged with an internal gas

    pressure of 10 MPa of hydrogen or argon. The hydrogen-charged samples were additionally

    tested at 50 and 100°C. Tensile testing showed that the equiaxed ferrite–pearlite microstructure

    of higher Mn steel was most sensitive to hydrogen embrittlement and that the banded ferrite–

    pearlite microstructure of the higher Mn strip was more susceptible to hydrogen embrittlement

    than the medium Mn strip. The more highly banded ferrite–pearlite microstructure in the higher

    Mn steel provided numerous sites for concentration of hydrogen to levels that promoted crack

    initiation and growth. Test temperatures up to 100°C reduced the yield and tensile strengths,

    increased the total elongation and decreased the extent of hydrogen embrittlement because of

    enhanced dislocation mobility and less effective hydrogen trapping.

Publication Date


  • 2016

Citation


  • Hejazi, D., Calka, A., Dunne, D. & Pereloma, E. (2016). Effect of gaseous hydrogen charging on the tensile properties of standard and medium Mn X70 pipeline steels. Materials Science and Technology, 32 (7), 675-683.

Scopus Eid


  • 2-s2.0-84981293937

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=6613&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/5585

Number Of Pages


  • 8

Start Page


  • 675

End Page


  • 683

Volume


  • 32

Issue


  • 7