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Production of Fe-Mn-Si-Cr-base shape memory alloy containing N

A memory alloy, fe-mn-si-cr technology, applied in the field of metallurgy, can solve the problems of increasing the cost of alloy smelting, achieve the effect of reducing the cost of alloy preparation, speeding up industrial application, and easy control of nitrogen content

Inactive Publication Date: 2005-07-27
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method is to use a vacuum melting furnace to obtain a Fe-30.0Mn-6.0Si shape memory alloy containing N0.047wt%, wherein N is obtained by adding Si 3 N 4 to be introduced, which will increase the melting cost of the alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Objective: To prepare Fe-25Mn-6Si-5Cr-0.09N (weight percent) shape memory alloy.

[0023] Materials: Industrial pure manganese, pure iron, pure chromium, pure silicon and smelting materials with high N content are used.

[0024] Preparation process: first place industrial pure iron, pure chromium, and pure silicon in the crucible of the induction furnace, evacuate to 0.01atm, and keep the vacuum condition for heating and melting; wait until the charge in the crucible is completely melted, then fill it with nitrogen to 1atm , the subsequent smelting has maintained this atmospheric pressure; then add commercially pure manganese, considering that manganese is a volatile substance, so 1% more commercially pure manganese should be added during smelting to ensure the required alloy composition; from the induction furnace After observing the complete melting of manganese through the window, immediately add the smelting material containing high N; the weight percentage of the s...

Embodiment 2

[0027] Objective: To prepare Fe-25Mn-6Si-5Cr-0.10N (weight percent) shape memory alloy.

[0028] Materials: Industrial pure manganese, pure iron, pure chromium, pure silicon and smelting materials with high N content are used.

[0029] Preparation process: first place industrial pure iron, pure chromium, and pure silicon in the crucible of the induction furnace, evacuate to 0.01atm, and keep the vacuum condition for heating and melting; wait until the charge in the crucible is completely melted, then fill it with nitrogen to 1atm , the subsequent smelting has maintained this atmospheric pressure; then add commercially pure manganese, considering that manganese is a volatile substance, so 1% more commercially pure manganese should be added during smelting to ensure the required alloy composition; from the induction furnace After observing the complete melting of manganese through the window, immediately add the smelting material containing high N; the weight percentage of the s...

Embodiment 3

[0032] Objective: To prepare Fe-20Mn-6Si-5Cr-0.18N (weight percent) shape memory alloy.

[0033] Materials: Industrial pure manganese, pure iron, pure chromium, pure silicon and smelting materials with high N content are used.

[0034] Preparation process: first place industrial pure iron, pure chromium, and pure silicon in the crucible of the induction furnace, evacuate to 0.01atm, and keep the vacuum condition for heating and melting; wait until the charge in the crucible is completely melted, then fill it with nitrogen to 1atm , the subsequent smelting has maintained this atmospheric pressure; then add commercially pure manganese, considering that manganese is a volatile substance, so 1% more commercially pure manganese should be added during smelting to ensure the required alloy composition; from the induction furnace After observing the complete melting of manganese through the window, immediately add the high-N smelting material; the weight percentage of this high-N-cont...

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Abstract

The invention opened a method to produce the Fe-Mn-Si-Cr shape-memory alloy containing N. The process is: first to add into the non-volatile metal in the vacuum of the induction furnace, then to add into the volatile metal in the protection of the N2, next adding into the refining material containing high N, last to cast and solidify. The invention make the alloy easy to add the N and it has reduced the cost.

Description

technical field [0001] The invention relates to a preparation method of a shape memory alloy, in particular to a preparation method of a N-containing Fe-Mn-Si-Cr base shape memory alloy. It belongs to the field of metallurgy technology. Background technique [0002] Since the discovery of the shape memory effect (SME) of Fe-Mn-Si-based alloys, extensive research has been conducted around this alloy. It is generally believed that the main factors affecting SME include: stacking fault energy, parent phase strengthening, and single variant. Obtaining as many single variants as possible is an important condition for improving SME. The stacking fault energy of Fe-Mn-Si-based alloys is very low, and it is easy to self-coordinate to form multiple variants, resulting in small macroscopic strains. Therefore, thermomechanical training is often used to obtain more single variants to improve SME. Because the γ→ε phase transformation is completed by means of stacking fault generation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C38/00
Inventor 万见峰陈世朴徐祖耀
Owner SHANGHAI JIAO TONG UNIV
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