1) Department of Materials, University of Science and Technology Beijing, Beijing 100083, China
2) State Key Laboratory of Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China

With the help of electron back scattering diffraction techniques and field emission microscope, the misorientation and the precipitation environment of Goss grains in conventional grain-oriented steel were observed and investigated at the initial stage of secondary recrystallization. It reveals that the abnormal Goss grains have a high fraction of high angle boundaries ranging from 25 to 40 deg. The most important observation is that some of {110}<001> grains in matrix indicated higher particle density than their neighbor grains during final annealing at 875°C before secondary recrystallization, which could create a favorable environment for their abnormal grain growth. Based on misorientation and precipitation results, the abnormal growth mechanism of Goss grains was sketched.

the National Natural Science Foundation of China (Grant No. 50871015)