Dynamic Twin Nucleation at Triple Junctions in Fe-32%Ni Stainless Steel

Hiromi Miura; Sutandyo Andiarwanto; Tetsuo Sakai; John J. Jonas

doi:10.4028/www.scientific.net/MSF.495-497.1159

Paper Titles

Impact of Local Texture on Recrystallization and Grain Growth via In Situ EBSD
p.1121

Solid State Phase Transformations under High Magnetic Fields in a Medium Carbon Steel
p.1131

Transformation Textures in Steels
p.1141

The Control of Texture and Grain Boundary Microstructure by Magnetic Annealing
p.1151

Dynamic Twin Nucleation at Triple Junctions in Fe-32%Ni Stainless Steel
p.1159

Magnetic Field Effect on the Microstructure of Low Silicon Steel
p.1165

Abnormal Grain Growth and Texture Development
p.1171

Representation of Misorientations in Rodrigues-Frank Space: Application to the Bain, Kurdjumov-Sachs, Nishiyama-Wassermann, Pitsch and Greninger-Troiano Orientation Relationships
p.1177

Monte-Carlo Version of Vertex Model Applied to Recrystallization Modeling
p.1183

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Dynamic Twin Nucleation at Triple Junctions in Fe-32%Ni Stainless Steel

Abstract:

The preferential initiation of dynamic recrystallization (DRX) at triple junctions (TJs) in stainless steel polycrystals was investigated in compression at 1123 K to 1323 K at a strain rate of 2 x 10-4 s-1. Nucleation appeared at TJs at strains as low as 0.1. This strain is only about 1/5 to 1/2 of the peak strain at which DRX is conventionally believed to occur extensively. Furthermore, DRX nucleation was not observed to take place at grain boundaries or in the matrix at this strain. The probability of DRX nucleation at TJs increased monotonically with strain and temperature. It also depended on the angle, y, between the compression axis and the sliding boundary. That is, when the angle, y, approaches 45 degrees, the probability of DRX nucleation at TJs is higher. These results reveal the important role of grain-boundary sliding (GBS) on DRX nucleation at TJs. It should also be noted that more than 90% of the grains nucleated at TJs were twins. Such dynamic twinning suggests that the essential DRX nucleation mechanism is twinning.