Phase Distribution and Transformation Dynamics in Fusion Welds using In-situ Synchrotron Diffraction Methods

摘要

Novel site-specific and fast diffraction techniques utilizing intense ynchrotron radiation have recently been employed to map the phases and their solid-state transformation in the heat-affected zone in a number of fusion welds in-situ during the welding process. These in-situ probes yield kinetics and microstructural evolution data not previously obtained with conventional post-mortem methods. Thus far, the synchrotron data provide not only some of the crucial experimental information for understanding the phase dynamics and microstructural development in fusion welds, but also realistic inputs for simulations as well as validating various kinetic models of phase transformation in welding metallurgy. The experimental progress to date will be reviewed in this paper.