Authors: Jing Yu Hong Chao Zhang Dewei Deng Asif Iqbal Sheng Zhi Hao
Publish Date: 2013/09/26
Volume: 87, Issue: 5-8, Pages: 1547-1556
Abstract
Remanufacturing is the only way for sustainable development of mechanical equipment manufacturing For remanufacturing blanks containing cracks the primary task is the prevention of crack propagation to ensure effectiveness of the manufacturing processes to follow When pulsed current passes through a specimen due to the existence of crack the temperature around the crack tips rises sharply and may even climb above the fusion point of the material which causes the crack tip to become blunt In this work with compressor rotor blade material FV520B as a specimen the distributions of current density temperature field and stress field are calculated at the instant of discharge based on the thermoelectrostructure coupled theory The crack arrest experiment is performed on high pulsed current discharge device of type HCPDI By making comparisons of morphology microstructure and size of fusion zone and heataffected zone HAZ around the crack tip before and after energizing the relationships between the sizes of fusion zone and the HAZ and the discharge energy and the current path are derived The obvious partition and refined grains around the crack tip are prominent because of violent temperature change The experimental and simulation results are found in fine agreement The high current pulsed discharge can be used effectively to prevent a crack to further expand and show substantial potentials for application in remanufacturing domain
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