A NEW MODEL OF GOSS TEXTURE DEVELOPMENT DURING SECONDARY RECRYSTALLIZATION OF ELECTRICAL STEEL

A new model of Goss texture development during the secondary recrystal lization of electrical steel is proposed and tested in this paper. Thi s model is based on the assumption that high-energy boundaries have hi gh grain boundary diffusion coefficients. High diffusion coefficients facilitate precipitate coarsening along the high-energy boundaries, wh ich in turn makes them mobile before other boundaries. Recent results obtained by the authors show that Goss grains are surrounded by the hi ghest number of high-energy boundaries. The assumption that these boun daries are highly mobile allows the Goss grains to grow during seconda ry recrystallization. The new model is tested using a Monte-Carlo simu lation of the grain growth in a 3-D polycrystalline computer specimen which describes both the microtexture and crystallographic texture of the electrical steel. The results of the simulation agree with experim ent. Specifically, the pinning force and incubation time of secondary recrystallization as well as the orientation of the secondary recrysta llized grains and the texture changes during grain growth are explaine d. (C) 1997 Acta Metallurgica Inc.