Abstract
The three-dimensional microstructures of two conventional 316L stainless steel and a grain boundary (GB) engineered one of the same material have been characterized by serial sectioning and electron backscatter diffraction (EBSD) mapping. The twin boundaries arrangement in the grain boundary network were investigated and compared. Although the triple junction character distribution and quadruple junction character distribution were improved slightly by grain boundary engineering, considerably higher proportions of triple junctions with two twin boundaries and quadruple junctions with three twin boundaries were formed after GB engineering, which will be more beneficial to the resistance to intergranular degradation. Large grain-clusters formed in the GB engineered material, and the topology structures of them are complex tree-ring shape twin-chain. In comparison, the grain-clusters in conventional material are small, having simple tree shape twin-chain.
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