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Effects of Hydrogen in Stress Triaxiality of API 5L X70 Steel

Materials research (São Carlos, São Paulo, Brazil), 2023-01, Vol.26 [Peer Reviewed Journal]

This work is licensed under a Creative Commons Attribution 4.0 International License. ;ISSN: 1516-1439 ;ISSN: 1980-5373 ;EISSN: 1980-5373 ;DOI: 10.1590/1980-5373-mr-2023-0111

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  • Title:
    Effects of Hydrogen in Stress Triaxiality of API 5L X70 Steel
  • Author: Freitas, B. B. ; Costa, L. R. O. ; Santos, T. A. A. dos ; Santos, D. S. dos
  • Subjects: API steel, Hydrogen embrittlement, Single-edge tension specimen, Notched tensile strength ; ENGINEERING, CHEMICAL ; MATERIALS SCIENCE, MULTIDISCIPLINARY ; METALLURGY & METALLURGICAL ENGINEERING ; Stress triaxiality
  • Is Part Of: Materials research (São Carlos, São Paulo, Brazil), 2023-01, Vol.26
  • Description: Hydrogen embrittlement (HE) in API 5L X70 steel was investigated by testing notched and unnotched uniaxial tensile specimens and single-edge tension specimen, SE(T). Apparent hydrogen diffusivity (Dapp = 1.4 x 10-10 m2/s) and solubility (Sapp = 4.9 mol H/m3) were determined by electrochemical hydrogen permeation tests. Through mathematical fitting, it was possible to separate the strong traps present at the beginning of the first permeation curve (φ = 0.43 mol H/m3). Uniaxial tensile tests showed a loss of ductility of up to 33% in the hydrogenated condition. Fracture mechanics tests exhibited a toughness decrease of 14% after exposure to hydrogen. The high resistance to HE was presented suggesting that these microalloyed steels can solubilize hydrogen in the matrix with low segregation, reducing the impact on embrittlement. A mix of ductile and quasi-cleavage fracture was observed in the hydrogenated samples with an increased stress triaxiality.
  • Publisher: ABM, ABC, ABPol
  • Language: English;Portuguese
  • Identifier: ISSN: 1516-1439
    ISSN: 1980-5373
    EISSN: 1980-5373
    DOI: 10.1590/1980-5373-mr-2023-0111
  • Source: SciELO
    GFMER Free Medical Journals
    DOAJ Directory of Open Access Journals
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