Study on fracture of aluminum alloy 2014 conical ring in hot ring rolling under different temperature

In this paper, various kinds fracture of aluminum alloy 2014 conical ring during hot ring rolling under different temperature were observed and compared by using SEM, EDS. Mechanisms of different fracture types were analyzed and the best temperature for hot ring rolling is decided. The results showed that the characteristic of fracture surface is mainly dimple fracture below 485 degrees C. The morphology of various kind of dimple fracture is different. This kind of fracture is resulted from inner micro-cracks that have a close relationship with impurity phase and rolling ring temperature. Fracture surface will transfer into intergranular fracture completely when heating up to 485 degrees C. This kind of fracture is resulted from a lot of impurity phase precipitated at grain boundary, meanwhile overheating structure and many micro-cracks occurred. Based on the results of fracture analysis optimum hot ring rolling temperature of aluminum alloy 2014 is also decided.