RESEARCH ON BONDING MECHANISM OF INTERNAL VOIDS IN BULK FORGINGS BY PHYSICAL MODEL SIMULATING

摘要

In term of the diffusion welding theory, temperature, pressure and holding time are the key parameters to eliminate the internal voids of bulk forgings. Aiming at the diffusion bonding mechanism, a new physical model applied with shear stress is set up and compared with the common model through analysing the three phases of diffusion bonding process in this paper. The physical simulation experiment is done on Gleeble-3500 machine and the key parameters for diffusion bonding process are discussed by observation of the microscopic structure of the bonding interface from experimental results, which shows that the macro shear deformation is helpful to hasten the bonding process.