|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||A Preliminary In-situ TEM Study of Migration Properties of Interfaces between Austenite and Ferrite in a Duplex Stainless Steel
||Juan Du, Frederic Mompiou, Wen-Zheng Zhang
|On-Site Speaker (Planned)
The migration properties of interfaces between austenite and ferrite in a duplex stainless steel were investigated by using in-situ transmitted electron microscope at temperature ranging from 725℃ to 900℃. The phase transformation from ferrite to austenite occurs either by the existing interfaces or by nucleation and growth of fresh austenite. Two modes, 1) normal motion and 2) ledge motion (including both lateral motion and normal motion), have been observed during the migration of facets between austenite and ferrite. The moving rate of interfaces along the long axis is much larger than that normal to the long axis. During the migration of interfaces, dislocations emitted from the interface to ferrite matrix were observed frequently, and matrix dislocations moving towards the interfaces may be merged on the interface. However, some matrix dislocations may interact with the tip of austenite lath, which slows down the moving rate.
||Planned: Supplemental Proceedings volume