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Non-rhenium nickel base single crystal superalloy and preparation method thereof

A high-temperature alloy and nickel-based single crystal technology, which is applied in the field of rhenium-free nickel-based single-crystal superalloy and its preparation, and aeroengine turbine blade materials, can solve the difficulty of increasing the tendency of TCP phase formation, increasing the activity of master alloy smelting, and deteriorating alloys. Microstructure uniformity and thermal corrosion resistance, etc., to achieve the effect of small solidification interval, wide melting temperature range and low alloy cost

Active Publication Date: 2013-12-11
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Non-rhenium nickel base single crystal superalloy and preparation method thereof
  • Non-rhenium nickel base 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 non-rhenium nickel base single crystal superalloy and a preparation method thereof. The non-rhenium nickel base single crystal superalloy comprises the following components in percentage by weight: 7.25-7.75% of Cr, 4.8-5.2% of Co, 1.8-2.2% of Mo, 7.8-8.2% of W, 6.3-6.7% of Ta, 6.0-6.2% of Al, 0.12-0.18% of Hf, 0.04-0.06% of C, 0.003-0.005% of B, 0.010-0.030% of Y, and the balance of Ni. The preparation method for the non-rhenium nickel base single crystal superalloy comprises the steps as follows: adopting a vacuum induction furnace to smelt the raw material into mother alloy, and preparing a mother alloy casting rod through gravity casting; adopting a seed crystal method to prepare a single crystal test bar within the temperature gradient of 150-250 K / cm and the withdrawing rate of 5-100 micron / s through a Bridgeman directional solidification technology; performing solution treatment on the single crystal superalloy for 2-4 h within the temperature range of 1,295-1,305 DEG C and performing air cooling, then performing high-temperature aging treatment on the single crystal superalloy for 2-4 h within the temperature range of 1,090-1,310 DEG C and performing air cooling; performing low-temperature aging treatment on the single crystal superalloy for 16-24 h within the temperature range of 850-890 DEG C and performing 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 i...

Claims

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Application Information

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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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