关键词: 超深冲搪瓷钢, 退火温度, 再结晶织构, 第二相

Abstract: An extra-deep drawing steel for enameling was annealed at different temperatures using continuous annealing simulator. The mechanical properties, recrystallization texture, microstructure and second phase particles of the annealed steel were studied by tensile testing machine, X-ray diffractometer, optical microscope and transmission electron microscope (TEM). The results show that the recrystallization texture of the tested steel after annealing is mainly distributed in γ orientation line, the texture types are mainly {111}<110> and {111}<112>, which contributes to high r value. With the increase of annealing temperature, the r value increases, which is attributed to the increase in density of the {111}<110> and {111}<112> textures with the increase of annealing temperature. Among them, the {111}<110> texture is increased significantly in density, while the density increment of {111}<112> texture is very small or even reduced, where the former significant increment is attributed to the weakening of grain pinning effect on {111}<110>texture orientation caused by TiC particle coarsening. The coarsening of TiC particles is a necessary condition for the full development of {111}<110>oriented grains during the annealing process, and is an important factor for the steel plates to achieve excellent formability. Meanwhile, as the {111} texture density increases, the strength of the steel plate decreases, the elongation after fracture increases, and the formability improves.

Key words: extra-deep drawing steel for enameling, annealing temperature, recrystallization texture, second phase