采用脉冲激光焊研究了Ti-50.6%Ni(摩尔分数)合金细丝点焊,对比分析了接头与母材显微组织、相变行为、Ni含量、显微硬度及应力-应变曲线的变化.结果表明:当NiTi合金用做功能材料时,激光焊接是可取的;激光点焊接头熔化区由树枝晶组成,热影响区靠近熔池部分为粗大等轴晶,靠近母材部分为细小等轴晶;激光焊会造成Ni的蒸发,使接头中Ni含量降低0.2%(摩尔分数),从而影响接头的相变行为;接头抗拉强度可达母材的70%,可恢复应变达母材的92%.
参考文献
| [1] | 任家烈;吴爱萍.先进材料的连接[M].北京:机械工业出版社,2000 |
| [2] | Potluri N B .Joining of shape memory alloys[J].Welding Journal,1999,78(03):39-42. |
| [3] | 李志远;钱乙余;张九海.先进连接方法[M].北京:机械工业出版社,2000 |
| [4] | Paren S .Post weld disturbance analysis in laser diode assemblies[OL].http://www2.sjsu.edu/faculty/selvaduray/page/papers/mate234/parenshah.pdf |
| [5] | A. Tuissi;S. Besseghini;T. Ranucci;F. Squatrito;M. Pozzi .Effect of Nd-YAG laser welding on the functional properties of the Ni-49.6at.%Ti[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1999(0):813-817. |
| [6] | Schloβmacher P;Haas T;Schuβler A.Laser welding of Ni-Ti shape memory alloys[A].California:Asilomar Conference Center,1994:85-90. |
| [7] | Y.T.HSU;Y.R.WANG;S.K. WU .Effect of CO_2 Laser Welding on the Shape-Memory and Corrosion Characteristics of TiNi Alloys[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2001(3):569-576. |
| [8] | 邱小明,孙大谦,李明高,刘卫红.Microstructures and properties of welded joint of TiNi shape memory alloy and stainless steel[J].中国有色金属学会会刊(英文版),2004(03):475-479. |
| [9] | 周振丰;张文钺.焊接冶金与金属焊接性[M].北京:机械工业出版社,1988 |
| [10] | Tjong S C;Zhu S M;Ho N J et al.Microstructural characteristics and creep rupture behavior of electron beam and laser welded AISI 316L stainless steel[J].Journal of Nuclear Materials,1995,227(1-2):24-31. |
| [11] | Miyazaki S;Igo Y;Otsuka K .Effect of thermal cycling on the transformation temperatures of Ti-Ni alloys[J].Acta Materialia,1986,34(10):2045-2051. |
| [12] | Xu Huang;Yong Liu .Effect of annealing on the transformation behavior and superelasticity of NiTi shape memory alloy[J].Scripta materialia,2001(2):153-160. |
| [13] | 杨大智;张连生;王凤庭.形状记忆合金[M].大连:大连工学院出版社,1988 |
| [14] | Wang G .Strngth f wdd nitin fr mdica appicatins[OL].http://www.engineeringreference. com/H-Processes/nitinolmedicalapplications. pdf |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%