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.
Effect of constraint on the fracture behaviour of a simulated heat-affected zone of an X-70 steel used in pipelines
Strain ; 48 , 2 ; 157-161
2012
5 Seiten, 5 Bilder, 2 Tabellen
Aufsatz (Zeitschrift)
Englisch
Bruchverlauf , Duktilität , Pipeline , Härte , Zähfestigkeit , Risslänge , Raumtemperatur , Mikrostruktur , Biegeprobe , Risswachstum , Martensit
Constraint Fracture in Simulated Weldments
British Library Online Contents | 1996
|Constraint Fracture in Simulated Weldments
British Library Conference Proceedings | 1996
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