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Hafnium-containing high-tungsten-nickel-based isometric crystal alloy and application thereof

An equiaxed crystal, high tungsten technology, applied in blade support elements, engine elements, machines/engines, etc., can solve the problem that the temperature bearing capacity of the blade cannot meet the requirements, and achieves good thermal stability, high temperature oxidation resistance and resistance. The effect of good hot corrosion performance and long-lasting performance

Active Publication Date: 2012-05-02
辽宁红银金属有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the increase of gas inlet temperature, the temperature bearing capacity of the deformed superalloy guide vane can no longer meet the requirements

Method used

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  • Hafnium-containing high-tungsten-nickel-based isometric crystal alloy and application thereof
  • Hafnium-containing high-tungsten-nickel-based isometric crystal alloy and application thereof
  • Hafnium-containing high-tungsten-nickel-based isometric crystal alloy and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The 500Kg vacuum induction furnace made in Germany is used to smelt the experimental master alloy. The smelting crucible is alumina crucible. The temperature measurement system is W-Re galvanic couple and JH-5 infrared photoconductive temperature / vacuum tester. The temperature measurement protection sleeve is Coated with ZrO 2 (CeO stabilized) and Mo-Al of BN 2 o 3 Metal-ceramic tube, the vacuum degree should be kept ≤10 -1 Pa order of magnitude. The operation process is as follows: put carbon, nickel-boron intermediate alloy, chromium, tungsten, niobium, hafnium, cobalt, zirconium and other alloy elements into the crucible; vacuumize the crucible to remove the adhesion Gas, when the vacuum reaches 10 -3 When a, increase the power to melt the alloy; ensure sufficient carbon-oxygen reaction at the initial stage of the material, and then refine at high temperature after melting to ensure uniform alloy composition. Refining at 1600°C for 5-7 minutes, cooling down after...

Embodiment 2

[0038] The present invention mainly adds more aluminum and titanium elements (Al+Ti<8wt.%) to form the gamma ' phase of high volume fraction to improve its intensity; Keep the content of chromium greater than 4.5wt.% and the ratio of Al / Ti greater than 2.5:1 can make the alloy reach the complete anti-oxidation level at high temperature; by adding niobium and hafnium, the number of γ′ phase can be further increased, the lattice mismatch degree of γ-γ′ can be improved, and the strengthening effect of γ′ phase can be enhanced. Form γ″ phase to enhance its mechanical properties at room temperature and medium temperature; add a certain amount of carbon, on the one hand, to strengthen the grain boundary, on the other hand, form more carbides with hafnium, niobium, chromium, etc. to strengthen the alloy; tungsten, cobalt and other alloys Elements mainly play an important role in solid solution strengthening alloys. The content of W+Hf+Nb is an important parameter to increase the creep...

Embodiment 3

[0046] The difference from Example 2 is that the alloy composition of this example is shown in Table 6, and the alloy durability performance corresponding to the alloy is shown in Table 7:

[0047] Table 6 Alloy element composition (wt.%)

[0048] C

Cr

co

Nb

Al

W

Ti

f

B

Zr

Ce

La

Ni

0.14

4.6

6.0

2.1

6.2

16.5

0.7

0.7

0.005

0.03

0.02

0.005

margin

[0049] Table 7 Typical Temperature Durability of Alloys

[0050]

[0051] Such as figure 1 As shown, it can be seen from the composite curves of the thermal strength parameters of the alloy of the present invention and the comparison alloy that the durable stress of the alloy of the present invention gradually decreases with the increase of the thermal strength parameter; especially after the thermal strength parameter P=26, the persistent stress The drop is huge. The compariso...

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Abstract

The invention relates to a nickel-based isometric crystal alloy, in particular to a hafnium-containing high-tungsten-nickel-based isometric crystal alloy and an application thereof. The hafnium-containing high-tungsten-nickel-based isometric crystal alloy consists of ingredients (in percentage by weight): 0.08 to 0.14 of C, 4.6 to 5.2 of Cr, 5.6 to 6.2 of Al, 0.7 to 1.2 of Ti, 6.0 to 8.0 of Co, 0.7 to 1.2 of Hf, 15.3 to 16.5 of W, 1.6 to 2.1 of Nb, 0.005 to 0.025 of B, 0.005 to 0.03 of Zr and the balance Ni. The alloy has good durability, the creep rupture life is longer than or equal to 40 hours under the conditions of 975 DEG C and 235.2 MPa, the alloy can be directly used for casting, the cost is low, and the production efficiency is high. The alloy can be used for preparing hot end components such as aircraft engines, gas turbine worm wheel blades and the like which can work for a long time at 1100 DEG C. Particularly, when the heat resisting alloy is adopted for manufacturing gasturbine worm wheel blades for electric generation, the work temperature and efficiency of a gas turbine can be obviously improved, and further, the electric generation efficiency is greatly improved.

Description

technical field [0001] The invention relates to a nickel-based equiaxed crystal alloy, in particular to a hafnium-containing high-tungsten nickel-based equiaxed crystal alloy and an application thereof. Background technique [0002] With the increase of gas inlet temperature, the temperature bearing capacity of the deformed superalloy guide vane can no longer meet the requirements. Cast superalloys have a higher temperature bearing capacity, which can reach 1000-1100 °C, so the development of cast superalloys has received extensive attention. Since the advent of cast high-temperature alloys in the 1940s, the development speed has been very fast. By the end of the 1950s, many alloys with excellent performance such as IN100, ЖС6К, B1900 and Mar-M200 have been developed, and domestically developed and produced one after another. A series of cast superalloys such as K403 and K417G. [0003] Whether it is Britain, the United States or Russia, the guide vane material of aero-eng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05F01D5/28
Inventor 孙晓峰于金江孟杰杨彦红王亮储昭贶金涛侯桂臣
Owner 辽宁红银金属有限公司
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