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Ta and Co co-doped corrosion-resistant Fe-Mn-Si-Cr-Ni serial shape memory alloy

A fe-mn-si-cr-ni, memory alloy technology, applied in the field of corrosion-resistant Fe-Mn-Si-Cr-Ni series shape memory alloy

Inactive Publication Date: 2019-12-06
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, how to simplify the production and heat treatment process, further improve the memory performance of iron-based shape memory alloys and have excellent corrosion resistance has always been a difficult problem for scholars.

Method used

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  • Ta and Co co-doped corrosion-resistant Fe-Mn-Si-Cr-Ni serial shape memory alloy
  • Ta and Co co-doped corrosion-resistant Fe-Mn-Si-Cr-Ni serial shape memory alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The Ta, Co co-doped corrosion-resistant Fe-Mn-Si-Cr-Ni series shape memory alloy of this embodiment case, the chemical composition of each element and its mass percent are: Fe-14Mn-6Si-9Cr-5Ni-6Co- 0.5 (TaC).

[0016] The alloy was aged at 700°C for 2 hours. The memory properties of alloys were measured by bending method. The sample is cut into 3mm×0.7mm×50mm sheet samples with a wire cutting machine to test the memory performance, and the shape memory effect is measured by the bending test method. The specific steps are: bend a flat sample after a certain process of heat treatment around a cylinder with a diameter of d for 180°, take out the sample after unloading, that is, the elastic partial recovery occurs, and measure the elastic recovery angle θe; then heat the sample to a certain The temperature was maintained for 5 minutes. At this time, due to the shape memory effect of the alloy, the shape of the sample obviously recovered. After cooling, the memory recovery...

Embodiment 2

[0021] The Ta, Co co-doped corrosion-resistant Fe-Mn-Si-Cr-Ni series shape memory alloy, the chemical composition and mass percentage of each element are: Fe-16Mn-5Si-9Cr-5Ni-9Co -1.0 (TaC).

[0022] The shape memory performance test method is as described in Case 1. Tested by bending method, the shape recovery rate of the obtained memory alloy is as attached figure 1 shown.

[0023] In order to investigate the corrosion resistance of the alloy, the aging treated samples were cut into corrosion samples (4.5×60×120mm) of appropriate size and soaked in simulated seawater. The corrosion rate of the alloy was tested by weight loss method. The results show that the corrosion rate of Fe-16Mn-5Si-9Cr-5Ni-9Co-1.0 (TaC) (mass percent %) shape memory alloy is 0.0015g / m 2 h.

Embodiment 3

[0025] Ta, Co co-doped high corrosion resistance Fe-Mn-Si-Cr-Ni shape memory alloy of this embodiment, the chemical composition and mass percentage of each element are: Fe-17Mn-5Si-9Cr-5Ni- 11Co-1.5(TaC).

[0026] The shape memory performance test method is as described in Case 1.

[0027] In order to investigate the corrosion resistance of the alloy, the aging treated samples were cut into corrosion samples (4.5×60×120mm) of appropriate size and soaked in simulated seawater. The corrosion rate of the alloy was tested by weight loss method. The results show that the corrosion rate of Fe-17Mn-5Si-9Cr-5Ni-11Co-1.5 (TaC) (mass percent %) shape memory alloy is 0.0012g / m 2 h.

[0028] Table 1 is the shape recovery rate and corrosion rate of the Fe-Mn-Si-Cr-Ni series shape memory alloy of embodiment 1-3:

[0029] Table 1

[0030]

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Abstract

The invention provides a Ta and Co co-doped corrosion-resistant Fe-Mn-Si-Cr-Ni serial memory alloy, and relates to the field of functional materials. The Ta and Co co-doped corrosion-resistant Fe-Mn-Si-Cr-Ni serial memory memorizing alloy comprises the following elements in weight percentage: 11 to 18% of Mn, 3-8% of Si, 5-13% of Cr, 3-10% of Ni, 1-11.0%of Co, 0.1-2.0% of Ta, 0.01-0.5% of C, and the balance Fe. According to the Ta and Co co-doped corrosion-resistant Fe-Mn-Si-Cr-Ni serial memory memorizing alloy, Ta and Co elements are added into the alloy, and TaC and other precipitated phasesare precipitated after aging treatment, so that an austenite matrix is strengthened, and the shape memory effect is improved; and the corrosion resistance is effectively improved by adding Co.

Description

technical field [0001] The invention relates to the field of functional materials, and proposes a Ta and Co co-doped corrosion-resistant Fe-Mn-Si-Cr-Ni series shape memory alloy. Background technique [0002] Shape memory alloy is a new type of functional material with shape memory effect, which has the function of temperature sensing and driving. The so-called shape memory effect refers to the phenomenon that a certain material can fully or partially return to the shape before deformation after it is deformed (usually below or near Ms) and kept at a certain temperature. Shape memory alloys mainly include Ni-Ti base, Cu base, iron base, etc. Among them, Fe-Mn-Si series and Fe-Mn-Si-Cr-Ni series memory alloys are widely used in iron-based shape memory alloys. It is used in pipelines and riveting parts in bridges, machinery, construction, aviation and other fields. [0003] In Fe-Mn-Si system, Fe-Mn-Si-Cr-Ni system shape memory alloy, the change of Mn content has a great inf...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/52C22C38/48C22C38/34
CPCC22C38/004C22C38/34C22C38/48C22C38/52C22C38/58
Inventor 董治中孙德山宁保群王志奇
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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