An Fe-based shape memory alloy pipe joint is introduced, which can solve the stress corrosion problem in pipelines

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The principle of Fe-based shape memory alloy pipe joints is that the shape memory effect of these alloys means that after the material is deformed (usually below or around the Ms temperature), it can return to its original shape when heated to a temperature above a certain threshold. Materials with this shape memory effect are called memory materials. The principle of using iron-based shape memory alloys to connect pipes is shown in Figure 2. At room temperature, the pipe fitting is expanded through deformation; as a result, the inner diameter of the fitting becomes larger than the outer diameter of the pipes to be connected, which makes it easier to insert those pipes into the fitting. Then, the fitting is heated to a certain temperature (above Af), and it contracts back to its original smaller diameter, thereby gripping the pipes tightly. To achieve the purpose of connecting pipes. Using iron-based shape memory alloy pipe fittings to connect pipes can prevent the changes in the microstructure that occur as a result of welding, as well as stress corrosion cracking at the pipe welds.