关键词: 裂纹止裂, 强流脉冲, 数值模拟, 再制造

Abstract: Remanufacturing is the only way of sustainable development of equipment manufacturing industry. For the rough materials containing cracks, the primary task is the prevention of crack propagating, to ensure the effectiveness of the remanufacturing processes followed. When the pulse current passing through the specimen, due to the existence of crack, the temperature located around crack tips rises sharply even over the melting point of materials and the shape of crack tips would be blunted. Using the method of complex variables functions, the models of current density, temperature and residual stress are derived around crack tips. With compressor rotor material FV520B as example, the distributions of current density, temperature field and residual stress are calculated for the instant of energizing. The crack arrest experiment is performed on the device of high current pulsed discharging of type HCPD-I. The morphological details of crack tip are compared between the initial and HCP treated samples. The consistency of experimental and simulation result is very well. The method of high current pulse discharging can prevent crack further expansion effectively and show substantial potentials for remanufacturing process.

Key words: Arresting crack, High current pulse, Numerical simulation, Remanufacturing