| 摘要: |
| 本文对TC17钛合金进行了激光焊接,对接头的宏观形貌、微观组织、显微硬度和拉伸性能进行了研究。结果表明：TC17钛合金母材由β相+等轴α相组成,且β相内存在大量针状次生a相；热影响区微观组织变化较为复杂,随着离焊缝距离的减小,等轴α相逐渐消失,β相尺寸逐渐增大,针状次生a逐渐消失,a马氏体逐渐产生并再次消失；焊缝主要由柱状树枝晶组成,气孔缺陷主要集中在焊缝中心线的中下部；从母材到焊缝,硬度总体呈下降趋势；受针状次生a相的影响,热影响区显微硬度先降低、再升高、再降低；由于焊缝硬度最低且存在气孔缺陷,TC17钛合金激光焊接接头拉伸断裂于焊缝中心。 |
| 关键词: 激光焊 微观组织 力学性能 TC17钛合金 |
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| Microstructure and Mechanical Properties of TC17Titanium Alloy Laser Welded Joint |
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Zhang Qunbing1,2,3, Dong Tuo4,5,6,7,5,6,3, Tan Mengmeng4,5,6,7,5,6,3, Men Haoxiang4,5,6,7,5,6,3, Zhang Jianxun4,5,6,7,5,6,8
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1.Xi '2.'3.an Aeronautical Institute;4.Xi &5.amp;6.#39;7.&8.an Jiaotong University
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| Abstract: |
| In this paper, the laser welding of TC17 titanium alloy was carried out, and the macroscopic morphology, microstructure, microhardness and tensile properties of the joint were studied. The results show that TC17 titanium alloy base material is composed of β phase and equiaxed α phase, and there is a lot of acicular secondary α phase in β phase. The microstructure of HAZ is complicated. With the decrease of distance to the weld, the equiaxial α phase gradually disappeared, the size of β phase gradually increased, the acicular secondary α gradually disappears, and the α martensite gradually emerged and disappeared again. The weld is mainly composed of columnar dendrites, and the porosity defects were mainly concentrated in the middle and lower part of the weld center line. From the base metal to the weld, hardness generally decreased. Affected by the acicular secondary α phase, the microhardness of the HAZ decreases first, then increases and then decreases. Due to the lowest weld hardness and porosity defects, the tensile fracture of TC17 titanium alloy laser welded joint was in the weld center. |
| Key words: Laser welding Microstructure Mechanical property TC17 titanium alloy |
