Influence of Process Parameters on Microstructure and Microhardness of TC4 Joints
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摘要: 采用Ti-Zr-Cu-Ni非晶钎料真空钎焊TC4钛合金，研究不同保温时间对钎焊接头的影响. 采用光学显微镜(OM)，扫描电子显微镜(SEM)，能谱仪(EDS)和显微硬度计对接头的显微组织和力学性能进行分析. 结果表明，焊缝主要组织为α-Ti与β-Ti，且随着保温时间的增加，焊缝区逐渐增厚，组织逐渐粗大. 当保温时间为40 min时，焊缝显微硬度最大，平均硬度（HV）为328，最大硬度为335.Abstract: TC4 titanium alloy was vacuum brazed with Ti-Zr-Cu-Ni amorphous brazing alloy, and the effects of different holding times on brazed joints were investigated. The optical microscope (OM), scanning electron microscope (SEM), energy data spectrometer (EDS) and micro-hardness tester were used to analyze the microstructure and mechanical properties of the joints. The results show that the main microstructure of the weld was α-Ti and β-Ti, and with the increase of holding time, the weld zone is gradually thickened and the microstructure is gradually coarse. When the holding time was 40 min, the micro-hardness of the weld was the largest, the average hardness (HV) was 328, and the maximum hardness was 335.
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Key words:
- TC4 titanium alloy /
- amorphous brazing alloy /
- microstructure /
- mechanical property
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图 8 不同保温时间下接头显微硬度曲线
Figure 8. Micro-hardness curves of joints under different holding time
表 1 TC4钛合金元素含量
Table 1. Elemental composition of TC4 titanium alloy
% 试样 Al V Ti Fe Si C N H O 其他 TC4钛合金 5.50～6.80 3.50～4.50 余量 ≤0.30 ≤0.15 ≤0.10 ≤0.05 ≤0.01 ≤0.20 <0.50 
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表 2 Ti-Zr-Cu-Ni非晶钎料元素含量
Table 2. Elemental composition of Ti-Zr-Cu-Ni amorphous brazing material
% 试样 Ti Zr Cu Ni 杂质 Ti-Zr-Cu-Ni非晶钎料 36.5 33.0 16.2 13.3 < 1.0
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表 3 保温时间20 min时接头EDS测试结果
Table 3. EDS test results of joints with holding time of 20 min
% 项目 Al Cu Ti Zr V Ni 点1 10.08 1.07 83.06 3.13 2.08 0.59 点2 6.27 3.99 76.06 7.32 3.26 3.10
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表 4 保温时间40 min时接头EDS测试结果
Table 4. EDS test results of joints with holding time of 40 min
% 项目 Al Cu Ti Zr V Ni 点3 9.90 0.69 85.24 2.75 1.42 — 点 4 5.83 4.82 74.90 7.43 4.45 2.47
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表 5 保温时间60 min时接头EDS测试结果
Table 5. EDS test results of joints with holding time of 60 min
% 项目 Al Cu Ti Zr V Ni 点 5 9.84 — 86.62 3.54 — — 点 6 7.14 6.71 67.27 5.00 5.48 8.40
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