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Method for improving recoverable strain of iron-manganese-silicon-based shape memory alloy

A memory alloy, iron-manganese-silicon-based technology, applied in the field of shape memory alloys, can solve the problems of poor mechanical properties and low recovery stress

Inactive Publication Date: 2019-01-11
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, cast iron-manganese-silicon-based alloys have poor mechanical properties and low recovery stress compared with deformed alloys.

Method used

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  • Method for improving recoverable strain of iron-manganese-silicon-based shape memory alloy
  • Method for improving recoverable strain of iron-manganese-silicon-based shape memory alloy

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. It is worth noting that the given embodiments can not be interpreted as limiting the protection scope of the present invention, and some non-essential improvements and adjustments made by those skilled in the art according to the content of the present invention above should still belong to the protection of the present invention. scope.

[0012] The percentage by weight of each element of the wrought iron-manganese-silicon-based shape memory alloy selected in Examples 1-3 and Comparative Example 1 is: Mn 20.68%, Si 6.28%, Cr 9.13%, Ni 4.83%, C 0.013%, and the balance is Fe and unavoidable impurities. When the temperature is higher than 1265°C, the alloy is in the high-temperature ferrite single-phase region. Examples 1-3 were first treated at 1265°C for 0.5 hours to 3 hours, then cooled to 1000°C to 1100°C at a rate of 0.5°C per minute to 2°C per minut...

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Abstract

The invention discloses a method for improving recoverable strain of an iron-manganese-silicon-based shape memory alloy, and belongs to the field of shape memory alloys. The recoverable strain of theprepared iron-manganese-silicon-based shape memory alloy is not lower than 6%. The method comprises the following specific steps that firstly, forged or rolled or drawn iron-manganese-silicon-based shape memory alloy is treated at 1250 DEG C-1310 DEG C for 0.5 hours to 3 hours; and then the alloy is cooled to 1000 DEG C-1200 DEG C at a speed of 0.1 DEG C per minute to 10 DEG C per minute, and thencooling is carried out to a room temperature. The average size of austenite grains of the iron-manganese-silicon-based shape memory alloy treated by the method is larger than or equal to 500 microns.

Description

technical field [0001] The invention relates to the field of shape memory alloys, in particular to a method for increasing the recoverable strain of iron-manganese-silicon-based shape memory alloys. The recoverable strain of the iron-manganese-silicon-based shape memory alloy prepared by the method is not less than 6%. Background technique [0002] After deformation, general metal materials cannot return to their pre-deformation shape without external force. However, shape memory alloy materials can be restored to their original shape by heating to a certain temperature after deformation. And this magical phenomenon is called the shape memory effect. It is precisely because shape memory alloys have shape memory effects and superelasticity that ordinary metal materials do not have, they have become a new type of smart alloys that integrate sensing and driving. This kind of alloy has broad application prospects in aerospace, biomedicine, machinery, chemical industry and oth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/00C21D6/00C22C38/06C22C38/34C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/58
CPCC21D1/00C21D6/004C21D6/005C21D6/007C21D6/008C22C38/001C22C38/06C22C38/34C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/58
Inventor 彭华备雍立秋赵兴保王改霞文玉华
Owner SICHUAN UNIV