Surface Properties of Quenched GCr15 Steel Enhanced by Electropulsing Ultrasonic Surface Rolling Process
ZHANG Shuo1, XU Zizhen1, ZHANG Bing1, SONG Guolin1, HAN Bin2, TANG Guoyi1
1 Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055; 2 Heilongjiang North Tools Co.,Ltd., Mudanjiang 157013;
Abstract: The current study aimed at enhancing the surface properties of high-frequency quenched GCr15 steel by electropul-sing ultrasonic surface rolling process(EUSR). Experiments were put forward to reveal the surface microhardness, strengthen layer, surface quality, friction and wear behaviors. Compared with traditional ultrasonic surface rolling technology, EUSR technology not only enhanced the surface hardness, but also promoted the depth of surface strengthened layer by 100 μm. Axial roughness was reduced from Ra of 1.40 μm to Ra of 0.23 μm, and the electron flow force could accelerate the movement of dislocations and enhance the ability of pasting energy barrier, which promoted the healing of miro-cracks and leaded to a better surface quality. EUSR treatment could improve the friction and wear performance, and the wear resistance of EUSR sample was increased by about 50%. For high-frequency quenched GCr15 steel, the electroplasticity effect would promote the movement of dislocations and enhance the material surface plastic deformation, which was facilitated in spreading the plastic strain of ultrasonic rolling into the materials interior, therefore the surface properties had a remarkable improvement.
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2017, Vol. 31 
