Low-chromium corrosion-resistant high-strength polycrystal high-temperature alloy and preparation method thereof

A high-temperature alloy and corrosion-resistant technology, which is applied in the field of low-chromium corrosion-resistant high-strength polycrystalline superalloy and its preparation, can solve the problems of alloy structure instability and influence, and achieve excellent oxidation resistance, excellent strength performance and corrosion resistance, The effect of excellent tissue stability

Active Publication Date: 2019-08-09
CHINA HUANENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the addition of Al element will also cause problems such as instability of the alloy structure, especially the higher content of Al element has a significant impact on the solidification and forming structure of the alloy.

Method used

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  • Low-chromium corrosion-resistant high-strength polycrystal high-temperature alloy and preparation method thereof
  • Low-chromium corrosion-resistant high-strength polycrystal high-temperature alloy and preparation method thereof
  • Low-chromium corrosion-resistant high-strength polycrystal high-temperature alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]The heat-resistant steel material of this embodiment includes by mass percentage: Cr: 17%, Co: 20%, Ti: 1.5%, Al: 4.0%, W: 7.0%, Si: 0.5%, Mn: 0.5%, Nb: 1.0%, C: 0.04%, the balance being Ni;

[0037] The preparation method of the present embodiment comprises the following steps:

[0038] 1) Raw material preparation: The ingredients include by mass percentage: Cr: 17%, Co: 20%, Ti: 1.5%, Al: 4.0%, W: 7.0%, Si: 0.5%, Mn: 0.5%, Nb: 1.0 %, C: 0.04%, the balance is Ni;

[0039] 2) Melting step: place the ceramic crucible and prepared raw materials in a vacuum melting furnace at the same time, and use a vacuum induction furnace at a vacuum degree not higher than 1.0×10 -4 Under MPa, the prepared alloy is smelted into alloy mother liquor, and when the alloy mother liquor is solidified, an electric arc is used to preheat the ceramic crucible at low power. After the alloy is completely solidified into an ingot, it is moved to a preheated ceramic crucible to prevent the alloy i...

Embodiment 2

[0045] The heat-resistant steel material of this embodiment includes by mass percentage: Cr: 17%, Co: 20%, Ti: 1.0%, Al: 4.0%, W: 8.5%, Si: 0.5%, Mn: 0.5%, Nb: 1.5%, C: 0.04%, the balance being Ni;

[0046] The preparation method of the present embodiment comprises the following steps:

[0047] 1) Raw material preparation: The ingredients include by mass percentage: Cr: 17%, Co: 20%, Ti: 1.0%, Al: 4.0%, W: 8.5%, Si: 0.5%, Mn: 0.5%, Nb: 1.5% %, C: 0.04%, the balance is Ni;

[0048] 2) Melting step: place the ceramic crucible and prepared raw materials in a vacuum melting furnace at the same time, and use a vacuum induction furnace at a vacuum degree not higher than 1.0×10 -4 Under MPa, the prepared alloy is smelted into alloy mother liquor, and when the alloy mother liquor is solidified, an electric arc is used to preheat the ceramic crucible at low power. After the alloy is completely solidified into an ingot, it is moved to a preheated ceramic crucible to prevent the alloy...

Embodiment 3

[0073] 1) Alloy preparation: Alloy components meet the following range requirements by mass percentage: Cr: 15%, Co: 15%, Ti: 0.5%, Al: 3.5%, W: 5%, Si: ≤0.5%, Mn: ≤0.5 %, Nb: 0.5%, C: 0.03%, the balance is Ni;

[0074] 2) Smelting: Melt the prepared alloy into alloy mother liquor, then use electroslag remelting process to refine, cool, after the alloy mother liquor is solidified into ingot and before the ingot temperature reaches 900°C, control the cooling rate not to exceed 15°C / min , after the ingot temperature reaches 900°C, it is cooled to room temperature at a cooling rate exceeding 10°C / min;

[0075] 3) Homogenization treatment: take out the ingot, then heat the ingot to 1030°C for half an hour, then heat it in a heat treatment furnace at 1170°C for 23 hours, and finally cool to room temperature to obtain a superalloy ingot;

[0076] 4) Hot rolling: the ingot is rolled, the total deformation is 50%, the deformation of each pass is controlled at 15%, and the deformation...

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Abstract

The invention provides a low-chromium corrosion-resistant high-strength polycrystal high-temperature alloy and a preparation method thereof. The low-chromium corrosion-resistant high-strength polycrystal high-temperature alloy is prepared from the components meeting the following range requirements in percentage by mass: 15-18% of Cr, 15-20% of Co, 0.5-1.5% of Ti, 3.5-4.5% of Al, 5-8.5% of W, lessthan or equal to 0.5% of Si, less than or equal to 0.5% of Mn, 0.5-1.5% of Nb, 0.03-0.08% of C, and the balance of Ni. After smelting, homogenizing treatment is conducted, hot rolling is conducted, and finally, heat treatment is conducted. According to the low-chromium corrosion-resistant high-strength polycrystal high-temperature alloy, the tensile yield strength of the alloy at the room temperature is higher than 850 MPa, the tensile yield strength of the alloy at the temperature of 850 DEG C is higher than 550 MPa, and the weight change of the alloy is smaller than 0.2 mg / cm<2> after the alloy is corroded in the 850 DEG C high-temperature flue gas environment (N2-15%CO2-3.5%O2-0.1%SO2) for 500 hours. In addition, the alloy has the excellent structure stability during 850 DEG C heat exposure.

Description

technical field [0001] The invention belongs to the field of high-temperature alloy materials, and in particular relates to a low-chromium corrosion-resistant high-strength polycrystalline superalloy and a preparation method thereof. Background technique [0002] As my country's electricity demand continues to increase, energy shortages and environmental pollution problems have become increasingly prominent, and the need to develop high-efficiency, energy-saving, and environmentally friendly power generation methods has become increasingly urgent. Thermal power generation has been the most important power generation technology in my country for a long time, and improving the steam parameters of the unit is considered to be the most effective way to solve the above problems. A lot of practice in the past has shown that the service performance of key component materials is the most important factor restricting the improvement of steam parameters of boiler units. Service perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C22C1/02C22F1/10
CPCC22C19/056C22C1/023C22F1/10
Inventor 严靖博谷月峰袁勇杨征张醒兴
Owner CHINA HUANENG GRP CO LTD
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