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程洪茂,刘奋成,杨光,仲超,林鑫,黄春平.电磁辅助激光修复Inconel718高温合金的组织及拉伸性能[J].稀有金属材料与工程(英文),2018,47(10):2949~2956.[Hongmao Cheng,Fencheng Liu,Yang Guang,Chao Zhong,Xin Lin and Chunping Huang.Microstructure and tensile property of electromagnetic stirring assisted laser repaired INCONEL 718 superalloy[J].Rare Metal Materials and Engineering,2018,47(10):2949~2956.]
Microstructure and tensile property of electromagnetic stirring assisted laser repaired INCONEL 718 superalloy
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Received:March 31, 2017  Revised:April 20, 2017
DOI:
Key words: electromagnetic stirring  laser repairing  superalloy
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
Author NameAffiliation
Hongmao Cheng,Fencheng Liu,Yang Guang,Chao Zhong,Xin Lin and Chunping Huang  
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Abstract:
      INCONEL 718 superalloy samples with V-grooves were experimentally repaired by electromagnetic stirring assisted laser repairing (EMS-LR) under different magnetic field currents. The effects of the magnetic field current on morphologies of single pass repaired zone (RZ), microstructure and mechanical properties of multilayer RZ were experimentally investigated. Microstructure observations show that metallurgical bonding was obtained between the RZ and the substrate when the optimized process parameter was used. The microstructure in RZ is coarse columnar crystal when no electromagnetic stirring was used, which growing epitaxially along the deposition direction. With the increase of magnetic field current, the convection of liquid metals prompts the transformation from the coarse columnar to fine equixed grains. The strong scour of liquid metal convection can affect the interdendritic g+Laves eutectic reaction and prohibit the growth of Laves phase. Electromagnetic stirring can improve the spreading of liquid metal in a certain extent. The width and deposition height of the single trace were measured and it was found that the width and deposition height ratio changed from 3.26 when no electromagnetic stirring was used to 3.33, 4.14 and 5.14 when the applied magnetic field current was 20, 40 and 60A, respectively, and the penetration was fond to be decreased inversely. The tensile strengths of repaired components increased from 487 MPa to 510, 673 and 770MPa for magnetic field currents of 0, 20, 40 and 60 A, respectively.