Feasibility study of titanium-nickel based super elastic alloy as the sealing material for oil well tubing and casing
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摘要: 针对目前特殊螺纹接头不能有效确保油井管的密封问题，选取Ti-56Ni以及Ti-55.5Ni-0.5V形状记忆合金，经过锻造及不同温度水淬处理，进行拉伸加载与卸载试验，循环压缩加载与卸载试验。结果表明，合金的拉伸与压缩弹性应变量可以达到5%以上，表现出良好的超弹性，证明Ti-56Ni以及Ti-55.5Ni-0.5V钛镍基超弹性合金可以用做机械设备的密封材料，为密封技术发展及钛镍基形状记忆合金应用提供了新方向。Abstract: In response to the current problem that premium connections cannot effectively ensure the sealing of oil and gas well tubing string, the titanium nickel and titanium nickel vanadium shape memory alloys were selected. These alloys were subjected to forging and water quenching at different temperatures, followed by tensile loading-unloading tests and cyclic compressive loading-unloading tests. The results indicate that the elastic strain of the alloys under both tensile and compressive conditions can exceed 5%, demonstrating excellent superelasticity. It is proven that the titanium-nickel-based Ti-56Ni and Ti-55.5Ni-0.5V superelastic alloys can be used as sealing materials for mechanical equipment, providing a new direction for the development of sealing technology and the application of Ti-Ni based superelastic shape memory alloys.
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Key words:
- Ti-Ni based alloy /
- Ti-Ni-V alloy /
- shape memory alloy /
- superelasticity /
- oil well tubing and casing /
- seal
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图 1 合金Ti-56Ni不同热加工状态试样拉伸应力-应变曲线
（a）TiNi-R-450; （b）TiNi-845-450;（c）TiNi-810-450
Figure 1. Tensile stress-strain curves of Ti-56Ni alloy specimens in different hot working states
图 2 合金Ti-55.5Ni-0.5V不同热加工状态试样拉伸应力-应变曲线
（a）TiNi-0.5V-R-450; （b）TiNi-0.5V-845-450;（c）TiNi-0.5V-810-450
Figure 2. Tensile stress-strain curves of Ti-55.5Ni-0.5V alloy specimens in different hot working states
图 3 合金Ti-56Ni不同热加工状态试样压缩应力-应变曲线
（a）TiNi-R-450; （b）TiNi-845-450;（c）TiNi-810-450
Figure 3. Compression stress-strain curves of Ti-56Ni alloy specimens in different hot working states
图 4 合金Ti-55.5Ni-0.5V不同热加工状态试样压缩应力-应变曲线
（a）TiNi-0.5V-R-450; （b）TiNi-0.5V-845-450;（c）TiNi-0.5V-810-450
Figure 4. Compression stress-strain curves of Ti-55.5Ni-0.5V alloy specimens in different hot working states
图 5 应变量为5%的TiNi-810-450试样应力应变循环曲线
（a）压缩应力应变；（b）拉伸应力应变
Figure 5. Stress-strain cycle curve of TiNi-810-450 specimen with a strain of 5%
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