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High-strength and high-plastic seawater corrosion-resistant alloy, its preparation method and application

A seawater-resistant and high-plastic technology, applied in the field of alloys, can solve problems such as poor high-temperature mechanical properties, and achieve the effects of low cost, simple preparation method and scientific formulation.

Active Publication Date: 2016-04-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to propose a high-strength, high-plasticity seawater corrosion-resistant alloy for the above-mentioned problem of poor high-temperature mechanical properties of existing alloys. The alloy has high strength and high corrosion resistance at high temperatures, and can meet the requirements of deep sea oil platforms and Requirements for pipe metal alloy components

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  • High-strength and high-plastic seawater corrosion-resistant alloy, its preparation method and application
  • High-strength and high-plastic seawater corrosion-resistant alloy, its preparation method and application
  • High-strength and high-plastic seawater corrosion-resistant alloy, its preparation method and application

Examples

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Embodiment 1

[0026] This embodiment discloses an Al-Co-Cr-Fe-Ni high-strength, high-plasticity seawater corrosion-resistant alloy, whose general formula is AlCoCrFeNi 1.9 .

[0027] The preparation method is as follows: the raw materials Al, Co, Mn, Cr, Fe and Ni are mixed according to the molar ratio, wherein Al, Co, Mn, Cr, Fe and Ni are all selected from industrial grade pure raw materials with a purity of more than 99 wt%. Then use the atmospheric medium frequency induction furnace for vacuum melting. When melting the alloy, the Al and Cr raw materials are placed at the bottom, the Fe and Ni raw materials are placed at the top, and the Co raw material is placed in the middle. The temperature is set at 1400 degrees Celsius, and the homogenization and heat preservation time of the alloy liquid after complete melting is 10 minutes. Obtained AlCoCrFeNi AlCoCrFeNi alloy with high strength, high plasticity and seawater corrosion resistance 1.9 .

[0028] High-strength and high-plastic sea...

Embodiment 2

[0030] This embodiment discloses an Al-Co-Cr-Fe-Ni high-strength, high-plasticity seawater corrosion-resistant alloy, whose general formula is AlCoCrFeNi 2.1 .

[0031] Its preparation method is identical with embodiment 1.

[0032] High-strength and high-plastic seawater corrosion-resistant alloy AlCoCrFeNi of the present invention 2.1 Laser confocal microscope microstructure pictures such as figure 2 It can be seen that almost all the structures in the figure are regular and uniform lamellar mixed structures composed of FeCoCr-rich phase and NiAl-rich phase.

[0033] attached image 3 It is the engineering strain curve of the high-strength, high-plastic seawater corrosion-resistant alloy in Example 1 and Example 2 under normal temperature conditions; Figure 4 It is the engineering strain curve of the high-strength, high-plasticity seawater corrosion-resistant alloy in Example 1 and Example 2 under the condition of 600 degrees Celsius; Figure 5 It is the engineering s...

Embodiment 3

[0037] This embodiment discloses a high-strength, high-plasticity seawater corrosion-resistant alloy whose general formula is AlMnCrFeNi 2.0 . The preparation method of the high-strength, high-plastic seawater corrosion-resistant alloy in this embodiment is the same as that in Embodiment 1.

[0038] After testing this embodiment AlMnCrFeNi 2.0 It also has excellent high-temperature mechanical properties and corrosion resistance, and can be widely used in key metal parts requiring high strength, high plasticity, and high corrosion resistance in the marine field or in key metal parts in ultra-supercritical power stations.

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Abstract

The invention provides a high-strength high-ductility sea water-resistance corrosion-resistance alloy, a preparation method and a purpose thereof. According to the invention, a general formula of the high-ductility sea water-resistance corrosion-resistance alloy is AlMCrFeNix, wherein M is selected from Co or Ni; and x is greater than or equal to 1.8 and less than or equal to 2.3 (mol fraction). The high-strength high-ductility sea water-resistance corrosion-resistance alloy contains specific element selection and composition, has excellent mechanical property and high corrosion resisting performance, and can be widely used in key metal parts with high-strength, high-ductility, high corrosion resistance requirements in sea field and can be used in key metal part in ultra-supercritical power station. The invention also discloses a preparation method of the high-strength high-ductility sea water-resistance corrosion-resistance alloy, the preparation method has the advantage of easy operation, and is convenient for industrial production.

Description

technical field [0001] The invention relates to alloy technology, in particular to a high-strength, high-plastic seawater corrosion-resistant alloy, its preparation method and application. Background technique [0002] Currently commonly used steels with better corrosion resistance include 316L, P91, P92, HR3C, etc., none of which can meet the high-temperature requirements of key metal components in the next generation of ultra-supercritical power plants (ultra-supercritical power plants require high temperatures at 700 °C The strength is above 350MPa), mainly because the high temperature strength of these steels is too low, such as when the temperature is above 700°C, the strength is lower than 350Mpa, so it cannot meet the use requirements. [0003] Oil platforms and oil pipelines under the deep sea are immersed in high-temperature seawater for a long time, and their metal alloy parts are required to have high strength and high corrosion resistance. Under the harsh servic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22C30/00C22C1/02
Inventor 李廷举卢一平董勇王同敏曹志强接金川康慧君
Owner DALIAN UNIV OF TECH
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