Abstract
The dependence of the mechanical properties respect to the microstructural orientation of a low carbon steel API-5L grade X46 pipe was assessed by Charpy impact and tensile strength tests, through the use of samples oriented in the longitudinal (L) and circumferential (C) directions. Also, a thorough microstructural and EBSD analysis were made. The steel presented anisotropic mechanical behavior, associated with the material forming process. The specimens oriented in the L direction, which is parallel to the microstructural banding, had a lower fracture resistance (K IC-CV ) and tensile properties (YS) than the C oriented specimens. According to obtained results, it is concluded that the influence of microstructural banding and crystallographic texture varies the fracture toughness of a material at least 10% between the L and the C directions. Hence, the anisotropy coefficient "r rv " was introduced to correlate quantitatively the microstructural properties to the anisotropic behavior of the API-5L X46 steel. The fracture resistance and tensile strength are mainly influenced by crystallographic texture, while the tensile ductility is associated to the microstructural banding.
Original language | English |
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Pages (from-to) | 57-67 |
Number of pages | 11 |
Journal | Procedia Structural Integrity |
Volume | 3 |
DOIs | |
State | Published - 2017 |
Keywords
- API steel
- Mechanical anisotropy
- fracture resistance