| 丝束同轴冷阴极电子束熔丝特性及TC4成形组织 |
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| 引用本文： | 许海鹰,杨光,张伟,杨波,桑兴华,王壮.丝束同轴冷阴极电子束熔丝特性及TC4成形组织[J].北京航空航天大学学报,2022,48(12):2373-2380. |
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| 作者姓名： | 许海鹰 杨光 张伟 杨波 桑兴华 王壮 |
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| 作者单位： | 1.中国航空制造技术研究院 高能束流发生器实验室，北京 100024 |
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| 基金项目： | 国家自然科学基金51775527 |
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| 摘 要： | 针对热阴极电子束轴侧熔丝与丝束同轴冷阴极电子束熔丝方法的特点进行分析，研究了丝束同轴冷阴极电子束熔丝增材制造熔滴过渡特点及获得滴状过渡和搭桥过渡方式需要满足的条件。采用直径2 mm的TC4钛合金丝材制备出丝束同轴冷阴极电子束熔丝增材制造的钛合金试样，对其微观组织进行分析，结果表明:与常规热阴极电子束轴侧熔丝成形的工艺相比，丝束同轴冷阴极电子束熔丝成形试样的组织表现为等轴晶与柱状晶层层交替叠加的状态，柱状晶与等轴晶尺寸明显减小，表明成形试样的晶粒细化，力学性能得到提高。
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| 关 键 词： | 丝束同轴 冷阴极电子束 熔丝增材制造 钛合金 微观组织 |
| 收稿时间： | 2021-03-25 |
Properties of gas discharge electron beam coaxial wire of fuse additive manufacturing and microstructure of TC4 titanium alloy |
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| Institution: | 1.Science and Technology on Power Beam Generator Laboratory, AVIC Manufacturing Technology Institute, Beijing 100024, China2.School of Mechanical Engineering & Automation, Beihang University, Beijing 100191, China |
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| Abstract: | Based on the analysis of fuse additive manufacturing using hot cathode electron beams with axial side feeding wires and gas discharge electron beam coaxial wire, the characteristics of droplet transfer of the gas discharge electron beam coaxial wire fuse additive manufacturing have been analyzed, and the conditions for obtaining droplet transfer and bridging transfer are also studied. A TC4 titanium alloy sample is made by gas discharge electron beam coaxial wire of fuse additive manufacturing by the mode of droplet bridging of Φ2 mm TC4 wire. The microstructure of the sample is compared with that manufactured by hot cathode electron beam fuse additive. Results show that the columnar and equiaxed grains of the sample overlap alternately layer by layer with an obvious decrease in their sizes, indicating that the sample grains of the sample are refined and that its mechanical properties can be improved. |
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