摘要
Using fast multiple rotation rolling(FMRR),a nanostructure layer was fabricated on the surface of Ti6Al4V alloy.The microstructure of the surface layer was investigated using optical microscopy,transmission electron microscopy,scanning electron microscopy,and X-ray diffraction.The results indicated that a nanostructured layer,with an average grain size of 72—83 nm,was obtained in the top surface layer,when the FMRR duration was 15 min.And the average grain size further reduced to 24—37 nm when the treatment duration increased to 45 min.High density dislocations,twins,and stacking faults were observed in the top surface layer.The microhardness of FMRR specimen,compared with original specimen,was significantly increased.A uniform,continuous and thicker compound layer was obtained in the top surface of FMRR sample,and the diffusion speed of N atom in the top surface layer was accelerated.FMRR treatment provides corrosion improvement.
作者
杨晓洁
常雪婷
范润华
YANG Xiaojie;CHANG Xueting;FAN Runhua(College of Ocean Science and Engineering,Shanghai Maritime University,Shanghai 201306,China;Shandong Institute for Product Quality Inspection,Jinan 250100,China)
基金
National Key Research and Development Program of China(No.2016YFB0300700)
Education and Scientific Research Project of Shanghai(No.19SG46)
Natural Science Foundation of Shanghai(No.17ZR1440900)
International Science and Technology Cooperation Program(No.CU03-29)
Project of Shandong Province Higher Educational Science and Technology Program(No.J17KA017)。