Abstract
The Widmanstätten austenite is well known precipitates at grain boundaries in duplex stainless steel welds, making the performance of welded joints degraded. That is affected by its morphology. However, the three dimensional microstructure has not been made abundantly clear. Almost all the studies on the morphology of Widmanstätten right now were based two dimensional only. In order to identify the morphology of Widmanstätten austenite, the three dimensional structure was observed by the serial sectioning three dimensional method. The Widmanstätten austenite in the same area observed on different cross-sections shows different morphologies and arrangements. And through the EBSD analysis, the relationship between part of the granular austenite in the ferrite grain and the Widmanstätten austenite precipitated at the grain boundary was determined.
