Unlock instant, AI-driven research and patent intelligence for your innovation.

Compound rare earth additive for low-ferromanganese-based memory alloy

A technology of compounding rare earth and memory alloy, which is applied in the field of memory alloy, can solve problems such as poor processing performance, low mechanical properties, and complicated training process

Inactive Publication Date: 2012-11-28
ZHENJIANG YINUOWEI SHAPE MEMORY ALLOYS
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to crystallographic calculations, the γ→ε martensitic phase transformation can provide at least 10% reversible strain, but the maximum reversible strain actually observed is only 9%, and it is found in single crystals. In practical applications In polycrystalline alloys, the fully reversible variable is very small, generally not more than 2%, and not more than 4% after training, and the training process is complicated
At the same time, due to the high amount of silicon in the iron-based memory alloy, the mechanical properties are low and the processing performance is poor. In addition, due to the high amount of manganese, the volatilization of manganese during the production process will inevitably affect the reversible variable of martensite, which is affecting its Main reasons for engineering applications

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Compound rare earth additive for low-ferromanganese-based memory alloy
  • Compound rare earth additive for low-ferromanganese-based memory alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Mn 16wt%, Si 4wt%, Ni 5wt%, C 0.1wt%, composite rare earth additive 0.4wt%, and the rest is Fe. After the alloy is prepared, it is melted in a medium frequency induction furnace. When the temperature of the alloy liquid reaches 1560~1580°C, it is kept for 3~4 minutes. When the temperature of the alloy liquid is 1530~1550°C, it is poured into Φ80×150mm Ingot. Put the poured ingot into a box-type resistance furnace for annealing. The purpose is to eliminate the internal stress caused by uneven cooling conditions during the casting cooling process and avoid cracking in the subsequent thermal processing process. The annealing temperature is 1080~1120℃, the time is 24h, forging the casting after annealing, the forging temperature is 1000~800℃, forging into 10mm×80mm×90mm, and then wire cutting, cutting into 1mm×10mm×90mm test Sample. The cut sample was tested for mechanical properties, and its shape memory recovery rate was measured by bending deformation method, and the f...

Embodiment 2

[0014] Mn 16wt%, Si 4wt%, Ni 5wt%, C 0.1wt%, composite rare earth additive 0.6wt%, and the rest is Fe. After the alloy is prepared, it is melted in a medium frequency induction furnace. When the temperature of the alloy liquid reaches 1560~1580°C, it is kept for 3~4 minutes. When the temperature of the alloy liquid is 1530~1550°C, it is poured into Φ80×150mm Ingot. Put the poured ingot into a box-type resistance furnace for annealing. The purpose is to eliminate the internal stress caused by uneven cooling conditions during the casting cooling process and avoid cracking in the subsequent thermal processing process. The annealing temperature is 1080~1120℃, the time is 24h, forging the casting after annealing, the forging temperature is 1000~800℃, forging into 10mm×80mm×90mm, and then wire cutting, cutting into 1mm×10mm×90mm test Sample. The cut sample was tested for mechanical properties, and its shape memory recovery rate was measured by bending deformation method, and the f...

Embodiment 3

[0016] Mn 16wt%, Si 4wt%, Ni 5wt%, C 0.1wt%, composite rare earth additive 1.0wt%, and the rest is Fe. After the alloy is prepared, it is melted in a medium frequency induction furnace. When the temperature of the alloy liquid reaches 1560~1580°C, it is kept for 3~4 minutes. When the temperature of the alloy liquid is 1530~1550°C, it is poured into Φ80×150mm Ingot. Put the poured ingot into a box-type resistance furnace for annealing. The purpose is to eliminate the internal stress caused by uneven cooling conditions during the casting cooling process and avoid cracking in the subsequent thermal processing process. The annealing temperature is 1080~1120℃, the time is 24h, forging the casting after annealing, the forging temperature is 1000~800℃, forging into 10mm×80mm×90mm, and then wire cutting, cutting into 1mm×10mm×90mm test Sample. The cut sample was tested for mechanical properties, and its shape memory recovery rate was measured by bending deformation method, and the f...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
melting pointaaaaaaaaaa
yield strengthaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention provides a compound rare earth additive for a low-ferromanganese-based memory alloy and belongs to the field of memory alloys. The compound rare earth additive is characterized by comprising chemical components of 20-28wt% of Nd, 8-15wt% of La, 5-10wt% of Y, 4-8wt% of Sc, 10-18wt% of Ce+Pr+Eu+Gd+Tb+Ho+Er+Tm+Lu, 2-6wt% of V, 2-5wt% of B and the balance of iron. The compound rare earth additive is a block-shaped alloy; the smelting point range of the compound rare earth additive is 1000-1250 DEG C; and the adding range of the compound rare earth additive is 0.4-1.0wt%.

Description

technical field [0001] The invention belongs to the field of memory alloys, in particular to a composite rare earth additive for low manganese iron-based memory alloys. Background technique [0002] Fe-Mn-Si shape memory alloy has broad application prospects because of its unique advantages. According to crystallographic calculations, the γ→ε martensitic phase transformation can provide at least 10% reversible strain, but the maximum reversible strain actually observed is only 9%, and it is found in single crystals. In practical applications In polycrystalline alloys, the fully reversible variable is very small, generally not more than 2%, and not more than 4% after training, and the training process is complicated. At the same time, due to the high amount of silicon in the iron-based memory alloy, the mechanical properties are low and the processing performance is poor. In addition, due to the high amount of manganese, the volatilization of manganese during the production ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/20C22C38/08
Inventor 司松海刘光磊李晓薇杨嵩张扣山
Owner ZHENJIANG YINUOWEI SHAPE MEMORY ALLOYS