1. College of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei， China 2. Institute for Structural Materials, Central Iron and Steel Research Institute, Beijing 100081, China
Abstract：The effects of annealing temperature in the intercritical region on microstructure and mechanical properties of 0.1C5Mn continuous casting billet were investigated. Scanning electron microscopy was used to characterize microstructure evolution during annealing process. The residual austenite content in the continuous casting billet after being annealed was measured by X-ray diffraction. It is found that carbides precipitate in the matrix on a low annealing temperature and then it is decreased with increasing annealing temperature. In addition, increasing annealing temperature increases the tensile strength but decreases the yield strength. Furthermore, with the increasing of annealing temperature increase the product of tensile strength to total elongation tensile strength first increases with temperature high up to 650℃ and then decreases with further increasing of annealing temperature. The total elongation of the steels annealed at 625-650℃ could be high up to 20%-25%, indicating that intercritical annealing for the medium-Mn steels could be applied to improve the mechanical properties of the cast billets of medium-Mn steels.
2013, Vol. 48 
