TRXRD Observations of Microstructural Evolution in Self-Shielded Flux Cored Arc Weld Deposits

摘要

The TRXRD technique with a 0.05 s time resolution was able to track phase changes during rapid heating and cooling in the HAZ of steel spot welds. The present work demonstrates that state-of-the-art diffraction methods using Synchrotron radiation can be used to investigate microstructure evolution in multicomponent industrially relevant steel welds. The results provide information about the kinetics of austenite formation from ferrite during weld heating, and stability of austenite at high temperatures. The results are being used to evaluate thermodynamic and kinetic models of weld microstructure evolution.