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A kind of rhenium-free nickel-based single crystal superalloy and preparation method thereof

A technology of nickel-based single crystal and superalloy, which is used in the field of rhenium-free nickel-based single crystal superalloy and its preparation, aero-engine turbine blade materials, and can solve the problem of deteriorating the uniformity of alloy structure and thermal corrosion resistance, and increasing the tendency of TCP phase formation. , the activity increases the difficulty of smelting the master alloy, and achieves the effect of wide melting temperature range, small solidification interval and low alloy cost.

Active Publication Date: 2015-12-09
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, MC2 increases the volume fraction of γ′ phase precipitation by adding alloying element Ti, but some studies have pointed out that the segregation of Ti element tends to promote the segregation of other elements, which deteriorates the microstructure uniformity and hot corrosion resistance of the alloy. At the same time, the increase in titanium content Increasing the degree of rafting after long-term aging will increase the tendency of TCP phase formation. In addition, the activity of Ti increases the difficulty of master alloy smelting

Method used

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  • A kind of rhenium-free nickel-based single crystal superalloy and preparation method thereof
  • A kind of rhenium-free nickel-based single crystal superalloy and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Alloy composition design

[0035] The rhenium-free nickel-based superalloy of the present invention has the following alloy components by mass percentage: 7.5%Cr, 5.0%Co, 2.0%Mo, 8.0%W, 6.5%Ta, 6.1%Al, 0.15%Hf, 0.05%C, 0.004%B, 0.015%Y, the balance of Ni. The composition of the designed alloy has the following characteristics: the number of electron vacancies is 2.17; the content of refractory elements (W, Ta, Mo) is 16.5%, of which W+Mo is 10%; the content of γ′ phase-forming elements (Al, Ta) is 12.6% .

[0036] (2) Master alloy smelting

[0037]According to the mass percentage of different alloying elements obtained by (1) composition design, the required alloy is configured by using high-purity metal components. Under high vacuum conditions, the master alloy was melted in a calcium oxide crucible with a melting power of 25kW and a melting time of 15 minutes.

[0038] (3) Master alloy casting rod preparation

[0039] After the master alloy was remelted in a ...

Embodiment 2

[0052] (1) Alloy composition design

[0053] The rhenium-free nickel-based superalloy of the present invention has the following alloy components by mass percentage: 7.25%Cr, 4.8%Co, 1.8%Mo, 7.8%W, 6.3%Ta, 6.0%Al, 0.12%Hf, 0.04%C, 0.003%B, 0.010%Y, the balance of Ni. The composition of the designed alloy has the following characteristics: the number of electron vacancies is 2.07; the content of refractory elements (W, Ta, Mo) is 15.9%, of which W+Mo is 9.6%; the content of γ′ phase-forming elements (Al, Ta) is 12.5% .

[0054] (2) Master alloy smelting

[0055] According to the mass percentage of different alloying elements obtained by (1) composition design, the required alloy is configured by using high-purity metal components. Under high vacuum conditions, the master alloy was melted in a calcium oxide crucible with a melting power of 22.5kW and a melting time of 22.5 minutes.

[0056] (3) Master alloy casting rod preparation

[0057] After the master alloy was remelte...

Embodiment 3

[0063] (1) Alloy composition design

[0064] The rhenium-free nickel-based superalloy of the present invention has the following alloy components by mass percentage: 7.75%Cr, 5.2%Co, 2.2%Mo, 8.2%W, 6.7%Ta, 6.2%Al, 0.18%Hf, 0.06%C, 0.005%B, 0.03%Y, the balance of Ni. The composition of the designed alloy has the following characteristics: the number of electron vacancies is 2.30; the content of refractory elements (W, Ta, Mo) is 17.1%, of which W+Mo is 10.4%; the content of γ′ phase forming elements (Al, Ta) is 12.7% .

[0065] (2) Master alloy smelting

[0066] According to the mass percentage of different alloying elements obtained by (1) composition design, the required alloy is configured by using high-purity metal components. Under high vacuum conditions, the master alloy was melted in a calcium oxide crucible with a melting power of 20kW and a melting time of 30 minutes.

[0067] (3) Master alloy casting rod preparation

[0068] After the master alloy was remelted in...

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Abstract

The invention discloses a rhenium-free nickel-based single crystal superalloy and a preparation method thereof. The composition of the rhenium-free nickel-based single crystal superalloy of the present invention is represented by mass percentage as 7.25-7.75% of Cr, 4.8-5.2% of Co, 1.8-2.2% of Mo, 7.8-8.2% of W, and 6.3-6.7% of Ta , 6.0-6.2% Al, 0.12-0.18% Hf, 0.04-0.06% C, 0.003-0.005% B, 0.010-0.030% Y, and the rest is Ni. The preparation of the above-mentioned rhenium-free nickel-based single crystal superalloy comprises the following steps: using a vacuum induction furnace to melt the master alloy, and preparing a cast rod of the master alloy by gravity casting; using the seed crystal method to pass the Bridgeman directional solidification technology at a temperature gradient of 150-250K / cm , the single crystal test bar was prepared at a pulling rate of 5-100 μm / s; the single crystal superalloy was solid solution treated in the range of 1295-1305 °C for 2-4 hours, followed by air cooling, and then in the range of 1090-1310 °C 2-4 hours of high-temperature aging treatment within 2-4 hours, followed by air cooling; then 16-24 hours of low-temperature aging treatment in the range of 850-890 ° C, followed by air cooling.

Description

technical field [0001] The invention relates to a nickel-based single-crystal superalloy and a preparation method thereof, in particular to a low-cost, high-temperature-resistant, high-strength rhenium (Re)-free nickel-based single-crystal superalloy and a preparation method thereof, which can be used as an aeroengine turbine blade material. Background technique [0002] With the development of the aviation industry, turbine blades are the most severe temperature load and the worst working environment in the aero-engine. Polycrystalline superalloys develop to directionally solidified columnar crystals and single crystals. At present, the inlet temperature of the engine is as high as 1400°C, and the traditional iron-based and cobalt-based superalloys can no longer meet the requirements. Showing excellent oxidation resistance and corrosion resistance, it has become the main material for turbine blades. In the development process of nickel-based single crystal superalloys in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C30B29/52C30B11/00
Inventor 陈光周雪峰郑功严世坦
Owner NANJING UNIV OF SCI & TECH
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