| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Advancements in Steel Structural Refinement
|
| Presentation Title |
Grain Misorientation Characterization of Continuously-cooled Vanadium Microalloyed Steels for Ferrite Classification |
| Author(s) |
Adam Church, Emmanuel De Moor, Lawrence Cho, Anastasiya Tselikova, Rolf Schmidt, Kip Findley |
| On-Site Speaker (Planned) |
Adam Church |
| Abstract Scope |
Electron backscattered diffraction (EBSD) data has been studied as a method for microconstituent identification in mixed ferritic/bainitic microstructures in microalloyed steels to quantitatively evaluate microstructural differences. In this study, specimens from two experimental V-microalloyed steels were heated to 1350 °C and cooled at rates of 1, 3, 10, and 25 °C/s in a TA Instruments® DIL-805L dilatometer to simulate temperature profiles in the coarse-grained heat affected zone of a weld. Orientation data of the produced microstructures was then collected using EBSD. Unique ferrite-ferrite grain-boundary misorientation distributions for acicular, bainite, and polygonal ferrite morphologies were identified. Two characteristic high-angle boundary misorientation (HABM) peaks were observed in both bainite and aciciular ferrite (AF) morphologies. AF transformed with two different morphologies depending on cooling rate with different HABM peak ratios, suggesting possible changes in orientation relationships (ORs). Bainitic morphologies produced misorientation distributions similar to that of the faster-cooled AF morphology. |