The typical heat-affected zone developed in an X-70 steel, usually used in pipeline manufacture, has been simulated via thermal treatment. A non-equilibrium microstructure consisting of bainite, with ferrite and some martensite, has been produced and mechanically characterised, resulting in much greater hardness and strength and a lower ductility and toughness than the corresponding base metal. This also has a lower ductility. Different single-edge notched bending specimens with different crack lengths (a/W between 0.1 and 0.5) were experimentally tested to assess the fracture behaviour of this product under different degrees of constraint. The J-a resistance curves at room temperature were determined, and the obtained results were explained by the effect of constraint on ductile crack growth.


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    Title :

    Effect of constraint on the fracture behaviour of a simulated heat-affected zone of an X-70 steel used in pipelines


    Contributors:
    Rivera, S. (author) / Lezcano, R. (author) / Rodriguez, C. (author) / Belzunce, F.J. (author) / Betegon, C. (author)

    Published in:

    Strain ; 48 , 2 ; 157-161


    Publication date :

    2012


    Size :

    5 Seiten, 5 Bilder, 2 Tabellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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