Study On Grain Refinement Of Brass H62 By ECAP

It is well known that, a lot of properties of metal material are in contact with their grain size, for instance, mechanical strength and hardness of material increase as the grain size of material minishes. Therefore, grain refinement of material is always an effective method that people improve comprehensive performance of metal material. But to many materials, the grain size is so hard to refine below submicrometer in the past, due to all kind of restrictions about technology and process. With the development of material science and the improvement of material preparation and processing, in the 1980s people began to study the material their grain size is below submicrometer, which is ultra-fine grain material.ECAP is an effective method to process ultra-fine grain material by deforming the material similar to simple shearing. Up to now people mainly research the microstructure, performance and the strain after ECAE, meanwhile materials researched mostly include pure copper, aluminium alloy, magnesium alloy, and titanium alloy instead of copper alloy in the world.In this paper the brass deformation force was calculated at room temperature, brass H62 samples were deformed at room temperature using the die designed by myself. The shearing feature on plane Y was obtained and the mechanism of shearing deformaion was explained. Moreover, tensile strength and hardness increase as the numbers of pass rise, tending to be stable until the pass three. According to the mechanical properties testing and hardness testing, ECAP behavior has strongly influnced the brass H62 grain refinement through scanning electron microstrucopy observation. At last Mafap 4.0 software achieved numerical simulation, then the result drew from simulation is similar to data from experiment.