采用高能电脉冲辅助超声滚压技术对高频淬火态GCrl5轴承钢进行了表面强化处理,并对表层硬度梯度、表面粗糙度以及摩擦磨损性能进行了表征.与普通超声滚压技术相比,声电耦合处理后样品在提高表面硬度的同时强化层深度提高约100μm,表面粗糙度Ra由1.4μm降低至0.23μm,并且在电脉冲作用下位错运动与越过能垒的能力都得到增强,从而促进表面微裂纹得到愈合,表面质量显著提高,摩擦磨损性能提高约50％.对高频淬火态GCr15轴承钢而言,脉冲电流的电致塑性效应能够促进位错运动,提高材料表面塑性变形能力,从而使超声滚压产生的塑性变形向次表层发展,显著提高强化效果.
The current study aimed at enhancing the surface properties of high-frequency quenched GCrl5 steel by electropulsing ultrasonic surface roiling 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 100μm 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 C-Crl5 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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