Microstructure, texture evolution and mechanical properties of X70 pipeline steel after different thermomechanical treatments
| Autor: | Mostafa Eskandari, Jerzy A. Szpunar, Enyinnaya Ohaeri, K. M. Mostafijur, A.A. Tiamiyu, Joseph Omale |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Misorientation Bainite Annealing (metallurgy) Mechanical Engineering Metallurgy Recrystallization (metallurgy) 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure Acicular ferrite 020501 mining & metallurgy 0205 materials engineering Mechanics of Materials Ferrite (iron) General Materials Science 0210 nano-technology Electron backscatter diffraction |
| Zdroj: | Materials Science and Engineering: A. 703:477-485 |
| ISSN: | 0921-5093 |
| Popis: | The evolution of microstructure, texture and mechanical properties of API X70 pipeline steel after different thermomechanical treatments has been studied using a combination of X-ray diffraction and electron backscatter diffraction (EBSD). Our investigations revealed that different microstructure consisting of polygonal ferrite, bainite, coarse and fine acicular ferrite grains was obtained with a centre line segregation traversing through and parallel to the rolling direction. EBSD investigations confirmed that both dynamic recovery and partial recrystallization occurred during hot rolling requiring further annealing for a more homogenous equiaxied grain structure. X-ray macro-texture measurement showed relatively a random texture components comprising of Cube, Goss, Brass, S, Copper, R cube and {331} . Texture inhomogeneity during hot rolling were observed for the different processing parameters. The grains at the surface are oriented towards {110} || ND while the mid thickness has grains mostly oriented in the {001} || ND with a spread towards the {111} || ND. We observed that after accelerated cooling, the fast cooling rate and low temperature interruption allows the formation of more bainite which in turn increased the tensile strength of the steel. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect