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Information Journal Paper

Title

Experimental Study of ّFracture Surface Characteristics of Inhomogeneous Drop Weight Tear Test Specimen Made from API X65 Steel

Pages

  77-91

Abstract

 In this study, the fractograghy of the Inhomogeneous Specimen (including seam weld) of API X65 Steel was performed for the first time by the Drop Weight Tear Test. The Fracture Surface of the test specimen consisted of three zones of base metal, heat affected zone and weld metal. The test was performed according to the API 5L standard. The crack initiated with a cleavage fracture from the notch root and then transformed to a shear failure with a 45 degree angle change to the surface plate and continued to the inverse fracture zone. SEM images of all three zones showed signs of ductile fracture including dimples of varying size, orientation and shape. Dimples study from beginning to the end of Fracture Surface showed that loading from the tensile state at the notch root was changed to shear loading at the end of Fracture Surface. Also, faint chevron marks with high density were observed in the center of Fracture Surface in the base metal. In the hammer impact zone, an inverse cleavage fracture was observed, which was enclosed on both sides by shear surfaces with an angle of 45 degree. The calculated ductile Fracture Surface was within the standard range and indicated the confirmed toughness of these steels for the use in gas transportation pipe lines.

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    APA: Copy

    Tazimi, M., HASHEMI, S.H., & RAHNAMA, S.. (2020). Experimental Study of Fracture Surface Characteristics of Inhomogeneous Drop Weight Tear Test Specimen Made from API X65 Steel. JOURNAL OF SOLID AND FLUID MECHANICS, 10(1 ), 77-91. SID. https://sid.ir/paper/397587/en

    Vancouver: Copy

    Tazimi M., HASHEMI S.H., RAHNAMA S.. Experimental Study of Fracture Surface Characteristics of Inhomogeneous Drop Weight Tear Test Specimen Made from API X65 Steel. JOURNAL OF SOLID AND FLUID MECHANICS[Internet]. 2020;10(1 ):77-91. Available from: https://sid.ir/paper/397587/en

    IEEE: Copy

    M. Tazimi, S.H. HASHEMI, and S. RAHNAMA, “Experimental Study of Fracture Surface Characteristics of Inhomogeneous Drop Weight Tear Test Specimen Made from API X65 Steel,” JOURNAL OF SOLID AND FLUID MECHANICS, vol. 10, no. 1 , pp. 77–91, 2020, [Online]. Available: https://sid.ir/paper/397587/en

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