Application of high-energy oscillating electric current pulse to relieve pulsed-laser surface irradiation induced residu
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n-tao Lai Department of Mechanical and Electrical Engineering, Shaoxing University, Shaoxing 312000, People’s Republic of China
Xiong Hu College of Logistics Engineering, Shanghai Maritime University, Shanghai 201306, People’s Republic of China
Zi-di Jin Zhejiang Province Key Laboratory of Advanced Manufacturing Technology, Zhejiang University, Hangzhou 310027, People’s Republic of China; and Beijing Geolight Technology Co., Ltd., Beijing 102628, People’s Republic of China
Hui Zhou Human Factors Research Unit, Institute of Sound and Vibration Research, University of Southampton, Southampton SO17 1BJ, UK
Zhen-sheng Yang College of Logistics Engineering, Shanghai Maritime University, Shanghai 201306, People’s Republic of China
Long Pan Zhejiang Province Key Laboratory of Advanced Manufacturing Technology, Zhejiang University, Hangzhou 310027, People’s Republic of China (Received 10 May 2016; accepted 4 October 2016)
The high-energy oscillating electric current pulse (ECP) technology was introduced to relieve the residual stresses in the small AISI 1045 steel specimens treated by the pulsed-laser surface irradiation. The high-energy oscillating ECP stress relief experiments were conducted to study the effectiveness of the high-energy oscillating ECP technology. In addition, the electroplasticity framework was developed based on the thermal activation theory to reveal the mechanism of the high-energy oscillating ECP stress relief. The results show that the high-energy oscillating ECP stress relief has good effects on eliminating the residual stress. Furthermore, the residual stress relieving mechanism of the high-energy oscillating ECP stress relief can be attributed to the electric softening effect and the dynamic stress effect. The findings confirm that the significant effects of high-energy oscillating ECP on metal plasticity and provide a basis to understand the underlying mechanism of the high-energy oscillating ECP stress relief.
I. INTRODUCTION
The larger tensile residual stress can be induced by the machining and manufacturing process, e.g., the highenergy pulsed-laser technology1,2 and the welding process.3,4 Under this condition, the fatigue lives of workpieces could be shortened5–7 by means of increasing the fatigue crack growth rate.8,9 So how to relieve the local larger tensile residual stresses in the workpieces Contributing Editor: Jürgen Eckert a) Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2016.402
induced by the machining and manufacturing process, e.g., the high-energy pulsed-laser technology and the welding process, has become an important topic in the industrial community. At present, the residual stress relieving technologies mainly include the thermal stress relief (TSR)10 and the vibratory stress relief (VSR).11–13 The TSR belongs to the conditional stress relieving technology compared with the VSR, in which the treated workpiece was placed in the annealing furnace to be heated up to the annealing temperature. Meanwhile, the treated workpiece need
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