Effect of heat treatment process on the size of battery cooling sheet after brazing
Different heat treatment processes were used for the core alloy ingot.The cold rolled products were annealed at 250℃×2 h and 400℃×2 h respectively,and then simulated brazing was carried out.The microstructure of the sample was observed with a metal-lographic microscope and the size data of the finished sample before and after brazing were measured with a vernier caliper.The test re-sults show that the ingot without soaking treatment has high Mn susaturation,and long and large grain size was obtained when its finished product was annealed with high temperature,and the grain size change is not obvious after brazing.No matter whether the ingot is soaking or not,the finished products are fiber microstructure after low temperature annealing,recrystallization microstructure after high temperature annealing,and recrystallization microstructure after brazing.The changes in the number of vacancies,dislocations and grain boundaries before and after brazing lead to the change of material density,which is the main reason for the size reduction af-ter brazing.For the material and process design of the battery cooling plate,non-soaking heat treatment of the ingot and the high tem-perature annealing of the finished product are adopted,and the product size reduction after brazing is the smallest.
万方数据
维普
