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Iron-based shape memory alloy for stainless steel pipe joint at specific temperature and preparation method of iron-based shape memory alloy

A technology of stainless steel tubes and memory alloys, applied in the field of memory alloys, can solve problems such as increased residual strain rate and incomplete shape memory, and achieve the effects of avoiding stress corrosion and delayed fracture

Active Publication Date: 2022-07-29
派来福(绍兴)记忆合金新材料科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the pre-strain is greater than 2%, the residual strain rate after recovery increases with the increase of the pre-strain, and incomplete shape memory is common.

Method used

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  • Iron-based shape memory alloy for stainless steel pipe joint at specific temperature and preparation method of iron-based shape memory alloy
  • Iron-based shape memory alloy for stainless steel pipe joint at specific temperature and preparation method of iron-based shape memory alloy
  • Iron-based shape memory alloy for stainless steel pipe joint at specific temperature and preparation method of iron-based shape memory alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The alloy is prepared with Mn28wt%, Si6wt%, Ni3wt%, Cr7wt%, Al1wt%, rare earth elements Nb0.2wt%, Y0.1wt%, Ce0.1wt%, Tb0.1wt%, and the rest are iron. After the alloy is prepared, it is melted in a high-frequency induction furnace. When the temperature of the alloy reaches 1500 °C, it is cast into an ingot after slag removal. Put the cast ingot into a box-type resistance furnace for homogenization annealing, the annealing temperature is 1200°C, and the time is 1h. The annealed castings were forged and hot rolled at 800°C into tubular specimens, which were then thermomechanically treated.

[0034] The recovery rate of the treated memory alloy pipe joint can reach 60% when the strain is 5%.

Embodiment 2

[0036] The prepared alloy is Mn24wt%, Si3wt%, Ni4wt%, Cr9wt%, Al1wt%, rare earth element, Y0.1wt%, Tb0.1wt%, and the rest is iron. After the alloy is prepared, it is melted in a high-frequency induction furnace. When the temperature of the alloy reaches 1500 °C, it is cast into an ingot after slag removal. Put the cast ingot into a box-type resistance furnace for homogenization annealing, the annealing temperature is 1200°C, and the time is 1h. The annealed castings were forged and hot rolled at 800°C into tubular specimens, which were then thermomechanically treated. In the further preparation method of the iron-based shape memory alloy, the thermomechanical treatment method is as follows: the sample is expanded at room temperature to increase its circumference by 4% to 5%, and after removing the load, annealing treatment is performed at 600° C. The time is 10 min, and then it is rapidly cooled to room temperature, and the number of repetitions is 2 to 4 times, and the pipe ...

Embodiment 3

[0039]The alloy is prepared with Mn32wt%, Si6wt%, Ni5wt%, Cr5wt%, Al1wt%, rare earth elements Nb0.2wt%, Y0.1wt%, Ce0.1wt%, Tb0.1wt%, and the rest are iron. After the alloy is prepared, it is melted in a high-frequency induction furnace. When the temperature of the alloy reaches 1500 °C, it is cast into an ingot after slag removal. Put the cast ingot into a box-type resistance furnace for homogenization annealing, the annealing temperature is 1200°C, and the time is 1h. The annealed castings were forged and hot rolled at 800°C into tubular specimens, which were then subjected to thermomechanical treatment. In the further preparation method of iron-based shape memory alloy, the thermomechanical treatment method is as follows: the sample is expanded at room temperature to increase its circumference by 4% to 5%, and after removing the load, annealing treatment is carried out at 600° C. The time is 10 min, and then it is rapidly cooled to room temperature, and the number of repeti...

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Abstract

The invention relates to the technical field of memory alloys, in particular to a preparation method of an iron-based shape memory alloy for a stainless steel pipe joint at a specific temperature, which comprises the following steps: (1) ingot casting: melting the alloy in a high-frequency induction furnace after the alloy is prepared, and when the temperature of the alloy reaches 1500 DEG C, slagging off and casting into a cast ingot; (2) annealing is conducted, specifically, a cast ingot obtained after pouring is put into a box-type resistance furnace to be subjected to homogenizing annealing, the annealing temperature is 1200 DEG C, and the time is 1 h; and (3) forming: rolling the annealed casting into a round bar shape, carrying out hot extrusion at 800 DEG C to prepare a tubular sample, and then carrying out thermal mechanical treatment on the sample. By means of the method, the shape memory alloy with the good shape memory effect can be obtained, the prepared shape memory alloy can be used as a connecting part and used for connecting various pipelines, welding connection is not needed when the memory alloy is used for connecting the pipelines, and the problems of weld joint delayed fracture and stress corrosion are avoided.

Description

technical field [0001] The invention relates to the technical field of memory alloys, in particular to a preparation method of an iron-based shape memory alloy used for stainless steel pipe joints at a specific temperature. Background technique [0002] Shape memory material is a new type of functional material developed in recent decades, which has a unique shape memory effect. Fe-based memory alloys are the third-generation shape memory materials developed after Ti-Ni memory alloys and Cu-based memory alloys. Compared with the former two, Fe-based memory alloys have low raw material cost, easy processing and manufacturing, and convenient transportation at room temperature. , excellent mechanical properties and other characteristics, has been widely used in petroleum machinery and chemical industries, and has become a current research hotspot. Iron-based shape memory alloys mainly include Fe-Mn-Co-Ti series, Fe-Pt series, Fe-Pd series, Fe-Mn-Si series, and Fe-Ni-C series. ...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/02C22C38/06C21D1/26C21D6/00B23P15/00
CPCC22C38/58C22C38/02C22C38/06C22C38/005C21D1/26C21D6/004C21D6/005C21D6/008B23P15/00
Inventor 何国球刘晓山黄子傲赖漾樊康乐易飞猛
Owner 派来福(绍兴)记忆合金新材料科技有限责任公司
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