采用电子背散射衍射(EBSD)技术研究了固溶处理的304不锈钢经6%-50%冷轧变形后在1173 K下进行长时间(24-96 h)退火后的晶界特征分布(GBCD). 结果表明, 经小变形(约6%)冷轧退火后的样品出现了较多的∑3n (n=1, 2, 3)特殊晶界, 较好地隔断了一般大角度晶界网络的连通性. 通过基于EBSD的单一截面迹线法对共格和非共格3晶界进行了区分测定, 显示被优化的晶界特征分布中, 非共格∑3孪晶界是其主要部分. 进一步分析指出, 非共格∑3晶界的迁移和反应与基于退火孪晶的中低层错能金属材料GBCD优化密切相关.
Grain boundary character distributions (GBCD) of type 304 stainless steel, which was strained by cold rolling and then annealed at 1173K, were analyzed by electron back scatter diffraction (EBSD). The results showed that low strain (~6%) followed by long-time annealing (24h~96h) resulted in a GBCD containing a higher fraction of ∑3n (n=1,2,3) boundaries (special boundaries), in which the connectivity of general high angle grain boundary (HAB) network was interrupted significantly by ∑9 and ∑27 segments. Incoherent and coherent 3 boundaries were identified by single-section trace analysis method, which showed that the major part of 3 boundaries were incoherent ones in the optimized GBCD. Further discussion pointed out that the migration and interaction of incoherent ∑3 boundaries might be the mechanism of twin-induced GBCD optimization.
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