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| 电子束修复IC10高温合金熔覆层组织分析 |
| Microstructure of Cladding Layer by Electron Beam for IC10 Single |
| Received:July 10, 2018 Revised:September 10, 2018 |
| DOI：10.3969/j.issn.1674-6457.2018.05.020 |
| 中文关键词: 单晶高温合金 真空电子束 显微组织 显微硬度 |
| 英文关键词: single crystal superalloy vacuum electron beam microstructure microhardness |
| 基金项目:国家自然科学基金（51461031）；轻合金加工科学与技术国防重点学科实验室基金（gf201501005） |
| Author Name | Affiliation | | GENG Zhi-jie | Department of Welding Engineering, Nanchang Hangkong University, Nanchang 330063, China | | WANG Shan-lin | Department of Welding Engineering, Nanchang Hangkong University, Nanchang 330063, China | | ZHANG Zi-yang | Department of Welding Engineering, Nanchang Hangkong University, Nanchang 330063, China | | CHEN Yu-hua | Department of Welding Engineering, Nanchang Hangkong University, Nanchang 330063, China | | KE Li-ming | Department of Welding Engineering, Nanchang Hangkong University, Nanchang 330063, China |
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| 中文摘要: |
| 目的 研究沉积速度对IC10熔覆层显微组织、显微硬度的影响以及界面的结合特征。方法 采用真空电子束填丝焊对IC10镍基单晶高温合金进行修复试验，采用XJP-2C型倒置光学显微镜观察熔覆层OM图像，能谱仪(EDS)测定各区域元素分布情况，401MVD型数显显微硬度计测量接头显微硬度。结果 在熔覆层上部出现等轴晶区和转向枝晶区，当沉积速度为220 mm/min时，熔覆层底部中心线左侧为取向一致的柱状晶，右侧为等轴晶；当沉积速度增加至300 mm/min时，底部等轴晶全部由柱状晶所取代。当沉积速度为220 mm/min时，熔覆层与基体区的显微硬度值基本相同；当沉积速度增加到300 mm/min时，熔覆层的显微硬度值最小。结论 随着沉积速度的增加，熔覆层横截面底部柱状晶数量明显增多，而等轴晶数量明显减少，最后全部由柱状晶取代，同时熔覆层的显微硬度值呈递减趋势。此外，在沉积速度为260 mm/min时，结合面实现了良好的冶金结合。 |
| 英文摘要: |
| The work aims to study the effect of deposited speed on the microstructure and microhardness of IC10 cladding layer and analyze the characteristics of interface combination. The filling welding of the vacuum electron beam welding (EBW) method was used to repair the nickel-base single crystal superalloy. The OM image of the cladding layer was observed by XJP-2C inverted optical microscope. The distribution of elements in each region was determined by energy dispersive spectroscopy (EDS). The microhardness of the joint was measured by 401MVD digital microhardness tester. The results showed that the regions of equiaxed crystals and diverted dendrite appeared in the upper region of the cladding layer. When the deposited speed was 220 mm/min, the left side of the center line at the bottom of the cladding layer was columnar crystals with the same orientation, and the right side was equiaxed crystals. When the deposited speed increased to 300 mm/min, the bottom equiaxed crystals were all replaced by columnar crystals. When the deposited speed was 220 mm/min, the microhardness values of the cladding layer and the matrix zone were basically the same. The minimum microhardness value of the cladding layer appeared when the deposited speed increased to 300 mm/min. In conclusion, with the increase of deposited speed, columnar crystals in bottom section apparently grow while equiaxed crystals obviously decrease and finally are all replaced by columnar crystals. Meanwhile, the microhardness value of the cladding layer shows a decreasing trend. Besides, when the deposited speed is 260 mm/min, the bonding surface achieves good metallurgical bonding. |
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