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,2018,47(10):2949~2956.[Hongmao Cheng,Fencheng Liu,Yang Guang,Chao Zhong,Xin Lin,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.]
电磁辅助激光修复Inconel718高温合金的组织及拉伸性能
投稿时间:2017-03-31  修订日期:2017-04-20
中文关键词:  电磁搅拌  激光修复  高温合金
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:
      本文以镍基高温合金Inconel718为研究的修复材料,对损伤V型槽添加不同磁场电流进行了电磁搅拌辅助激光修复试验,研究了不同磁场电流对单道修复形貌和多层修复区组织性能的影响。显微组织表明:优化工艺参数后使激光快速成形的修复区和基体形成了致密的冶金结合,未施加电磁搅拌的修复区组织为沿沉积方向外延生长的粗大柱状晶,随着磁场强度的增大,从而加剧液态金属的对流作用,液态金属强烈的对流作用对枝晶间 g+Laves共晶反应有影响,抑制Laves相的生长。电磁搅拌在一定程度下可以提高液态金属的铺展性,未添加磁场时单道的沉积宽度与沉积高度比值为3.26,随着磁场强度(20A、40A、60A)增大,比值分别为3.33、4.14和5.14。对修复件进行了拉伸力学性能测试,未施加磁场时,修复件的抗拉强度最高为487MPa,随着磁场强度(20A、40A、60A)增加,抗拉强度逐渐得到提升,分别为510MPa、673MPa、770MPa。
Microstructure and tensile property of electromagnetic stirring assisted laser repaired INCONEL 718 superalloy
英文关键词:electromagnetic stirring  laser repairing  superalloy
英文摘要:
      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.
作者单位E-mail
程洪茂 南昌航空大学 轻合金加工科学与技术国防重点学科实验室 903852462@qq.com 
刘奋成 南昌航空大学 轻合金加工科学与技术国防重点学科实验室 fencheng999@163.com 
杨光 沈阳航空航天大学  
仲超 南昌航空大学 轻合金加工科学与技术国防重点学科实验室  
林鑫 西北工业大学  
黄春平 南昌航空大学  
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