刘全明,肖俊峰,唐文书,等.Ti-Zr-Cu-Ni钎料钎焊TA2钛合金的界面组织和拉伸强度研究[J].精密成形工程,2025,17(6):36-45.
LIU Quanming,XIAO Junfeng,TANG Wenshu,et al.Interface Microstructure and Tensile Strength of TA2 Titanium Alloy Brazed by Ti-Zr-Cu-Ni Filler Metals[J].Journal of Netshape Forming Engineering,2025,17(6):36-45. |
| Ti-Zr-Cu-Ni钎料钎焊TA2钛合金的界面组织和拉伸强度研究 |
| Interface Microstructure and Tensile Strength of TA2 Titanium Alloy Brazed by Ti-Zr-Cu-Ni Filler Metals |
| 投稿时间：2025-01-20 |
| DOI：10.3969/j.issn.1674-6457.2025.06.004 |
| 中文关键词: Ti-Zr-Cu-Ni钎料 钎料组织，TA2钛合金 钎焊界面组织 接头拉伸强度 |
| 英文关键词: Ti-Zr-Cu-Ni filler metals microstructure of filler metals TA2 titanium alloy brazing interface microstructure tensile strength of brazed joints |
| 基金项目:国家自然科学基金(52304385);陕西省重点研发计划(2024GX-YBXM-214);中国华能集团科技项目(HNKJ18-H11) |
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| 中文摘要: |
| 目的 通过自制Ti-Zr-Cu-Ni钎料实现TA2钛合金钎焊连接，研究Ti-Zr-Cu-Ni钎料合金组织特征、接头界面组织、熔蚀特性及拉伸强度，为燃机损伤部件钎焊修复用钛基钎料及钎焊工艺研发提供理论支撑。方法 采用SEM、XRD分析了钎料及钎焊接头的组织，研究了钎料类型对接头拉伸性能的影响。结果 降低钎料中Cu、Ni的含量并添加Sn或V元素后，(Ti、Zr)固溶体相尺寸减小;Sn、V更倾向于与Ti、Zr结合形成复杂的晶体相并向(Ti、Zr)固溶体中汇集，元素扩散区深度减小，晶间渗入距离未见变化;引入5.0%(质量分数)Sn、1.5%(质量分数)V后，接头拉伸强度分别为300.6 MPa和302.7 MPa;非晶钎料无明显晶体相，晶间渗入距离明显增大，接头拉伸强度为267.0 MPa。结论 钎焊接头界面为完全反应型结构，当钎料中引入5.0% Sn、1.5% V后，拉伸强度小幅降低，非晶钎料钎焊接头拉伸强度大幅降低，塑性指标均有所提升。少量微元素形成的晶体相对接头强度影响有限，非晶钎料钎焊界面冶金反应充分，形成更多脆性相，导致接头强度大幅下降。添加Sn或V后，分别在接头组织中形成Ti2Sn3、Ti6Sn5、Zr5Sn3或Ni3VZr2、NiV3、Ni2V等晶体相，可改善接头塑性。 |
| 英文摘要: |
| The work aims to utilize self-made Ti-Zr-Cu-Ni filler metals to achieve TA2 titanium alloy connection, analyze the microstructure of Ti-Zr-Cu-Ni filler metals and the interface microstructure, erosion resistance and tensile strength of the brazed joints and provide theoretical support for the research and development of titanium based filler metals and brazing processes for repairing the damaged components of gas turbine. SEM and XRD were used to analyze the microstructure of filler metals and brazed joints and study the effect of filler metal types on the tensile properties of brazed joints. Reducing Cu and Ni and adding Sn or V in filler metals reduced the size of (Ti, Zr) solid solutions. Sn and V tended to combine with Ti and Zr to form complex crystal phases and converged into the (Ti, Zr) solid solution. The depths of the element diffusion zone were significantly reduced and there was no significant change in the distance of intergranular infiltration. After introduction of 5.0wt.% Sn and 1.5wt.% V, the tensile strength of the brazed joints was 300.6 MPa and 302.7 MPa, respectively. The amorphous filler metals had no obvious crystal phase, the distance of intergranular infiltration significantly increased, and the tensile strength of the brazed joints was 267.0 MPa. The interface of the brazed joints is fully reactive. After introduction of 5.0wt.% Sn and 1.5wt.% V, the tensile strength decreases slightly, while the tensile strength of amorphous filler metal brazed joint decreases significantly, and the plasticity indexes are improved. The crystal formed by only a small amount of trace elements has limited effect on the strength. The metallurgical reaction of amorphous filler metal is sufficient, forming more brittle phases, and resulting in a significant decrease in joint strength. Adding Sn or V formed crystal phases such as Ti2Sn3, Ti6Sn5, Zr5Sn3 or Ni3VZr2, NiV3, Ni2V in the microstructure of brazed joints improves the plasticity of the brazed joints. |
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