Abstract
To study the influences of continuous annealing temperature on microstructure, mechanical properties and textures of battery shell steel, continuous annealing experiments were conducted at 710 °C, 730 °C, 760 °C and 780 °C respectively. The mechanical properties and normal anisotropy index (r) were measured by tensile test and the textures were investigated using the method of electron backscatter diffraction (EBSD). The results show that as annealing temperature rose, the grain size, fracture elongation and r value increased, whereas the strength and yield ratio decreased. The yield strength was 122 MPa, the tensile strength was 286 MPa, meanwhile the elongation and r value arrived at 38.8% and 2.3 when the annealing temperature rose to 780 °C. After annealing, the main texture in battery shell steel is {111} <112>, followed by {111} <110>. With the increase of annealing temperature, textures in {001} crystallographic plane weakened while textures in {111} plane strengthened, which is beneficial to the deep drawability of the steel.
Highlights
In recent years, as the sustainable development concept of energy-saving and environment protection gets popular, new energy vehicles have been developed rapidly
The battery shell steel used to produce the shell of battery pack, which is the core component of new energy automobiles, has received extensive attention at the same time [1]
All processes go on automatically with high speed but many problems exist in them, such as blocking in the mold, fracture, earing, etc. [4]. These problems have a direct connection with deep drawability of the steel, which is influenced by many factors including strengthening mechanisms, grain size, morphology and orientation
Summary
As the sustainable development concept of energy-saving and environment protection gets popular, new energy vehicles have been developed rapidly. These problems have a direct connection with deep drawability of the steel, which is influenced by many factors including strengthening mechanisms, grain size, morphology and orientation. All these micro factors are affected by the annealing process directly and significantly. For battery shell steel under the ideal plain-strain condition, a better deep drawability can be obtained when there are strong {111} textures. By optimizing the parameters of the annealing process, the density of {111} texture and r value can be increased, improving the drawability [7,8,9]. Since the property of battery shell steel is improved, larger competitiveness of some steel mills can be realized and more contribution can be made to the development of new energy automobiles
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