About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Developments in Plate and Line Pipe Steels
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| Presentation Title |
Forensic Metallurgy of Pipeline Steel Thermal Histories - Prospects through EBSD Characterization |
| Author(s) |
Ayobami Alice Oladipo, Matthew A Steiner , Eric J Payton |
| On-Site Speaker (Planned) |
Ayobami Alice Oladipo |
| Abstract Scope |
The orientation relationship (OR) between the crystallographic variants of martensite in prior austenite grains is a function of austenite composition at the time of transformation, making the OR indicative of thermal history. It can, however, be challenging to distinguish between martensite, bainite, and ferritic phases in some steel microstructure. Electron backscatter diffraction (EBSD) is an established technique for investigating crystallographic information such as crystallographic phase or grain boundary misorientation, including the well-known Kurdjumov–Sachs and Nishiyama–Wassermann OR models. This research investigates how the correlation of measured ORs in different steel weld regions can be utilized to predict thermal history. Crystallographic variants are characterized using EBSD while the orientation relationship is analyzed within the MTEX MATLAB toolbox. The correlation between the parent and product orientation relationship is demonstrated as a potential approach for forensic metallurgy of pipeline steel welds. |