GRAIN BOUNDARY PLANE DISTRIBUTIONS IN THE COLD–ROLLED AND ANNEALED FERRITIC STAINLESS STEEL
Received date: 2009-09-25
Revised date: 2010-02-10
Online published: 2010-04-11
Supported by
Supported by National Natural Science Foundation of China (No.50771060 and 50974147)
The grain boundary plane distribution in the cold–rolled and annealed ferritic stainless steel has been analyzed statistically by a five–parameter method based on the mis–orientations of adjacent grains and the orientations of grain boundary traces determined by electron backscatter diffraction (EBSD) attached to a field emission scanning electron microscope (FE–SEM). The results show that no preferred texture occurrs either in grain orientations or grain boundary mis–orientations characterized by axis–angle pairs in the specimens which were cold rolled by 85% reduction in thickness and subsequently annealed at 780 ℃. However, there are developed textures for the orientations of grain boundary planes. And also, the preferred planes vary with averaged grain size levels. At the level of 9 μm, grain boundary planes favor the {100} orientation, with their density distribution 12% higher than a random distribution; Whereas at the level of 15 μm, {111} planes are preferred and {100} and {112} planes are sub–preferred, with the density distribution on {111} about 10% higher than a random distribution. Moreover, the anisotropy of grain boundary plane distributions is larger at specific mis–orientations. The discussion points out the preferred grain boundary planes might possess lwer energes and tend to being preserved due to their lower growth rates during annealing.
FANG Xiao-Yang , YU Wei-Guo , ZHOU Bang-Xin . GRAIN BOUNDARY PLANE DISTRIBUTIONS IN THE COLD–ROLLED AND ANNEALED FERRITIC STAINLESS STEEL[J]. Acta Metall Sin, 2010 , 46(4) : 404 -410 . DOI: 10.3724/SP.J.1037.2009.00650
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