Method for connecting TiNi shape memory alloy and austenitic stainless steel heterogenetic material

A technology of austenitic stainless steel and memory alloy, which is applied in the fields of machinery, medical treatment, materials, and electricity to achieve automatic welding, good plasticity, and improved strength and toughness

Inactive Publication Date: 2011-08-17
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method for connecting TiNi shape memory alloy and austenitic stainless steel heterogenetic material
  • Method for connecting TiNi shape memory alloy and austenitic stainless steel heterogenetic material

Examples

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Effect test

Embodiment 1

[0019] Embodiment 1. Using the method of the present invention to carry out laser welding of TiNi alloy wire and stainless steel wire to prepare dental compound orthodontic arch wire. The cross-sectional dimensions of TiNi alloy wire and stainless steel wire are both 0.64mm (width)×0.48mm (thickness). A copper intermediate layer (thickness 80 μm) was placed on the interface between TiNi alloy wire and stainless steel wire (without leaving a gap), and a pulsed laser heat source was used to melt the interface area to form a welded joint of TiNi alloy-stainless steel dissimilar materials. Laser welding process parameters: pulse energy 7.2J; pulse width 6ms; shielding gas (Ar) flow rate 8L / min. The tensile strength of TiNi alloy-stainless steel dissimilar material laser welding joint is 520MPa (compared with the joint without copper interlayer, the joint strength is increased by more than 2 times); the bending angle of the laser welding joint is 180° (compared with the joint witho...

Embodiment 2

[0020] Embodiment 2, adopt the method of the present invention to carry out the laser welding of TiNi alloy and stainless steel plate. The thickness of both the TiNi alloy and the stainless steel is 0.54 mm. The copper interlayer (thickness 90 μm) is placed on the TiNi alloy and stainless steel interface (without leaving a gap), and the interface area is melted by a pulsed laser heat source to form a TiNi alloy-stainless steel welded joint. Laser welding process parameters: pulse frequency 30Hz; pulse width 5ms; laser power 312W; welding speed 1m / min; shielding gas (Ar) flow rate 9L / min. The tensile strength of the TiNi alloy-stainless steel laser welded joint is 510MPa; the bending angle of the joint is >120°; the shape memory effect recovery rate of the TiNi alloy heat-affected zone of the joint is >90%.

Embodiment 3

[0021] Embodiment 3, adopt the method of the present invention to carry out micro-beam plasma arc welding of TiNi alloy and stainless steel plate. The thickness of the TiNi alloy and stainless steel plates is 0.75 mm. The copper intermediate layer (thickness 120 μm) is placed on the TiNi alloy and stainless steel interface (without leaving a gap), and the micro-beam plasma arc heat source is used to heat and melt the interface area to form a TiNi alloy-stainless steel welded joint. Micro-beam plasma arc welding process parameters: welding current 10A; welding speed 12.5cm / min; ion gas (Ar) flow rate 0.28L / min; shielding gas (H21%+Ar) flow rate 9.5L / min; nozzle aperture 0.75mm. The tensile strength of the TiNi alloy-stainless steel micro-beam plasma arc welding joint is 500 MPa; the bending angle of the joint is >80°; the shape memory effect recovery rate of the TiNi alloy heat-affected zone of the welded joint is >85%.

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Abstract

The invention relates to a method for connecting a TiNi shape memory alloy and an austenitic stainless steel heterogenetic material, and belongs to a heterogenetic material connection technology. In the method, aiming at the welding problem of the TiNi shape memory alloy and the austenitic stainless steel heterogenetic material, on the basis of the characteristics of limitless mutual solubility of copper and nickel, finite solid solubility of copper and titanium, iron and chromium, higher strength and plasticity of copper solid solution, lower brittleness of a copper-titanium intermetallic compound and the like, the copper solid solution can be extracted from a welding line region and the brittle intermetallic compounds can be reduced by adopting a pure copper packing material (a copper middle layer or a copper welding wire) and reducing the penetration ratio of a TiNi alloy base material, so the strength and flexibility of a welding joint between the TiNi shape memory alloy and the stainless steel heterogenetic material. The method comprises the following processes of: adding the pure copper middle layer (pure copper welding wire), adjusting the position of a heat source, protecting a welding region, and melting and welding.

Description

technical field [0001] The invention relates to a method for connecting a TiNi shape memory alloy and austenitic stainless steel dissimilar materials in the technical fields of materials, machinery, electricity, medical treatment, etc., and belongs to the dissimilar material connection technology. Background technique [0002] Shape memory alloy is a new type of functional material, which has special shape memory effect (SEM) and superelasticity (SE). TiNi alloy is the most widely used alloy with shape memory effect. In addition to the advantages of high shape memory recovery rate, it also has the characteristics of high specific strength, fatigue resistance, corrosion resistance and good biocompatibility, and has been widely used in aerospace, atomic energy, ocean development, instrumentation, household appliances and medical fields. a wide range of applications. With the advancement of science and technology and the development of modern industry, modern society has put ...

Claims

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Application Information

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IPC IPC(8): B23K31/12B23K103/24
Inventor 孙大千李洪梅
Owner JILIN UNIV
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