表面技术2018，Vol.47Issue(2)：8-13,6.DOI:10.16490/j.cnki.issn.1001-3660.2018.02.002
超声滚压强化7075铝合金工件表面性能的研究
Surface Properties of 7075 Aluminum Alloy Workpieces after Ultrasonic Burnishing Processing
摘要
Abstract
The work aims to explore effects of ultrasonic burnishing (UB) technology on surface properties of 7075 aluminum alloy workpieces.Finish turning and ultrasonic burnishing were applied to rotating bar specimens made from 7075 aluminum alloy successively.Effects of rolling reduction among process parameters on surface properties of the specimens including surface roughness,surface microhardness,surface microstructure and surface residual stress were investigated with roughness tester,microhardness tester,metalloscope and X-ray diffraction stress analyzer before and after the finish turning and UB.After finish turning,surface roughness of the specimens decreased from 0.976 μm to 0.047 μm,surface microhardness of the specimens increased from 105.6HV0.2 to 119HV0.2 (increased by 15％).After UB,surface grain of the specimens was approximate the same as that of the central grain.The surface grain of the UB specimens was considerably refined compared to the central grain after UB.Residual compressive stress was all induced on the surface layer,the maximum value appeared on the surface and the residual compressive stress layer was 1.75 mm deep.The residual compressive stress on the top surface was up to-174.0 MPa,but it tended to decrease as a whole as distance from the top surface increased.By comparing the specimens receiving finish turning and UB,it can be concluded that UB can remarkably reduce surface roughness of the specimens,dramatically refine surface grain,noticeably improve surface microhardness,improve distribution of residual stress and introduce certain depth of residual compressive stress.关键词
超声滚压强化/7075铝合金/压下量/表面粗糙度/显微硬度/残余压应力Key words
ultrasonic burnishing/7075 aluminum alloy/rolling reduction/surface roughness/microhardness/residual comprehensive stress分类
矿业与冶金引用本文复制引用
叶寒,赖刘生,李骏,刘森忠,熊晖..超声滚压强化7075铝合金工件表面性能的研究[J].表面技术,2018,47(2):8-13,6.基金项目
江西省科技落地计划项目(KJLD13005)Supported by the Education Department of Jiangxi Province (KJLD13005) （KJLD13005）
