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Fe-Mn-Si-C memory alloy material and technology and application for producing pipe joint thereof

A technology of memory alloys and pipe joints, applied in other manufacturing equipment/tools, manufacturing tools, etc., can solve the problems of low recovery strain and recovery stress capacity, low pressure bearing capacity, poor sealing performance, etc., to achieve large pressure bearing capacity, Low cost and good sealing performance

Inactive Publication Date: 2007-01-03
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention solves the problem that the existing Fe-Mn-Si-based memory alloy material has low recovery strain and recovery stress capacity, and the pipe joint made of this material has low connection strength, poor sealing performance and low pressure bearing capacity. Defects, providing a Fe-Mn-Si-C memory alloy material with good sealing performance and strong pressure bearing capacity and its process and application for making pipe joints

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  • Fe-Mn-Si-C memory alloy material and technology and application for producing pipe joint thereof
  • Fe-Mn-Si-C memory alloy material and technology and application for producing pipe joint thereof

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Embodiment Construction

[0009] According to the basic principle of Fe-Mn-Si-based memory alloy, the present invention adds C atoms on the basis of Fe-Mn-Si memory alloy, and appropriately reduces the content of Mn to form carbon-containing Fe-Mn-Si memory alloy, namely Fe-Mn-Si-C memory alloy.

[0010] The Fe-Mn-Si-C memory alloy material of the present invention contains Fe-Mn-Si-C, and is produced by smelting the Fe-Mn-Si-C memory alloy. The chemical composition of the Fe-Mn-Si-C memory alloy material includes the following substances in total percentage: 17-19% of Mn, 5-6% of Si, 0.25-0.35% of C and the rest of Fe.

[0011] The pipe joint made of the Fe-Mn-Si-C memory alloy material needs to be quenched at 700-800°C before reaming.

[0012] The Fe-Mn-Si-C memory alloy pipe joint of the present invention can be applied to connect hollow pipes or dissimilar materials, and can also be used to connect unsuitable welding materials (such as dissimilar materials).

[0013] The process of making pipe jo...

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Abstract

The present invention relates to one kind of Fe-Mn-Si-C memory alloy material with high sealing performance and high pressure bearing capacity and the tube union therewith. The Fe-Mn-Si-C memory alloy material has strength, recoverable strain and recoverable stress obviously higher than those of common Fe-Mn-Si alloy, and has easy smelting, low cost and other advantages similar to common Fe-Mn-Si alloy. The Fe-Mn-Si-C memory alloy can obtain recoverable strain over 5 % and recoverable stress over 350 MPa without need of training treatment.

Description

Technical field: [0001] The invention relates to a Fe-Mn-Si-C memory alloy material and its process and application for making pipe joints. Background technique: [0002] Fe-Mn-Si-based memory alloys have the advantages of low cost, convenient smelting and processing, and high plasticity. They have attracted people's attention, and a large number of researches, developments and applications have been carried out. But ordinary Fe-Mn-Si memory alloys and Fe-Mn-Si-Cr-Ni memory alloys have low recoverable strain and recoverable stress (much lower than Ni-Ti and Cu-based memory alloys), which hinders their practical application . In order to improve the recoverable strain, some researchers have proposed methods such as training treatment and thermal pre-deformation, which can significantly increase the recoverable strain, but the process is complicated and has no practical value, especially not suitable for pipe joints. At present, ordinary Fe-Mn-Si based memory alloy pipe join...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04B23P23/04
Inventor 戴品强刘声桓周丽花
Owner FUZHOU UNIV