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- Title
Effect of Hyperbaric Chamber Gas on Transformation Texture of the API-X70 Pipeline Weld Metal.
- Authors
Azar, Amin; Østby, Erling; Akselsen, Odd
- Abstract
The development of the texture components in the X70 weld metal under several shielding environments was investigated using the electron-backscattered diffraction (EBSD) and orientation imaging microscopy (OIM) techniques. A new method for assigning the reference direction (RD), transverse direction (TD), and normal direction (ND) was introduced based on the morphological orientation of the grains. The analyses showed that different shielding gases affect the weld metal texture and microstructure. The shielding environment with pure argon shows the highest orientational pole density values and dominant acicular ferrite microstructure. It was observed that the distribution of misorientation angle and special coincidence site lattice (CSL) grain boundaries play significant roles in determining the tensile characteristics of the weld samples. Moreover, the bainite lattice orientation was found dependent on the directional heat flow unlike the other detected constituents.
- Subjects
HYPERBARIC chambers; PIPELINE welding; ELECTRON backscattering; MICROSTRUCTURE; ARGON; FERRITES; CRYSTAL grain boundaries; BAINITE
- Publication
Metallurgical & Materials Transactions. Part A, 2012, Vol 43, Issue 9, p3162
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-012-1157-x