3n special boundary distributions of the cold-rolled and annealed 304 stainless steel

Acta Metall Sin

2007, Vol. 43

Issue (12): 1239-1244 DOI:

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3n special boundary distributions of the cold-rolled and annealed 304 stainless steel

FANG Xiao-Ying

山东理工大学机械工程学院

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FANG Xiao-Ying. 3n special boundary distributions of the cold-rolled and annealed 304 stainless steel. Acta Metall Sin, 2007, 43(12): 1239-1244 .

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Abstract 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.

Key words: ∑3n boundaries single-section trace analysis incoherent ∑3 boundaries 304 stainless steel

Received: 06 April 2007

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