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Re/Ru-containing monocrystal nickel-based superalloy with high temperature resistant capability and high creep resistance

A nickel-based superalloy, creep technology, applied in the direction of single crystal growth, single crystal growth, crystal growth, etc., can solve the problems of unsuitability for industrial production, high cost, etc., and achieve the improvement of transverse mechanical properties and fatigue strength, high thermal stability and thermal fatigue resistance, the effect of reducing manufacturing costs

Inactive Publication Date: 2015-09-16
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the Re and Ru contents of the fourth-generation single-crystal nickel-based superalloys in the world are generally 6% and 3%, and the cost is high, which is not suitable for industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Table 1 lists the comparison of the chemical composition of the alloy of the present invention and the reference alloy.

[0045]

Al

Ta

Cr

Mo

co

W

Re

Ru

f

Ni

N4

6.0

5.0

3.3

4.0

7.0

4.0

6.5

4.0

---

Bal

DD03

6.2

7.5

2.8

3.1

7.1

4.2

4.3

3.1

0.08

Bal

[0046] Table 1

[0047] In Table 1, DD03 is the alloy composition of the present invention, and N4 is the chemical composition of the reference alloy.

[0048] The above-mentioned alloy is tested with a sheet sample whose cross-section is 2 mm × 4.5 mm. Table 2 lists the comparison of the durability life of the alloy of the present invention and the reference alloy (standard sample) after complete heat treatment.

[0049] Table 2

[0050]

Creep temperature (℃)

Creep stress (MPa)

Creep life (h)

N4

1100

137

329

DD03

1100

...

Embodiment 2

[0055] Table 4 is the single crystal nickel-based superalloy prepared by adopting the upper limit of the alloy composition of this patent, and the composition of the alloy is shown in Table 4 below in terms of weight percentage:

[0056]

Al

Ta

Cr

Mo

co

W

Re

Ru

f

Ni

DD03

6.4

8.2

3.2

3.5

7.5

4.6

4.8

3.5

0.12

Bal

[0057] Table 4

[0058] Table 5 lists the durability life of the alloys in Table 4 of the present invention after complete heat treatment.

[0059] table 5

[0060]

Creep temperature (℃)

Creep stress (MPa)

Creep life (h)

DD03

1100

137

335

DD03

1085

137

397

[0061] Table 6 lists the size comparison of the element-depleted layer in the alloy subsurface layer after the alloy in Table 4 of the present invention has been oxidized for 300 h.

[0062] Table 6

[0063]

Embodiment 3

[0065] Table 7 is the single crystal nickel-based superalloy prepared by adopting the lower limit of the alloy composition of this patent, and the alloy is composed by weight percentage:

[0066]

Al

Ta

Cr

Mo

co

W

Re

Ru

f

Ni

DD03

5.6

7.2

2.2

2.5

6.5

3.8

4.2

2.8

0.05

Bal

[0067] Table 7

[0068] Table 8 lists the durability life of the alloys in Table 7 of the present invention after complete heat treatment.

[0069] Table 8

[0070]

Creep temperature (℃)

Creep stress (MPa)

Creep life (h)

DD03

1100

137

311

DD03

1085

137

369

[0071] Table 9 lists the size comparison of the element-depleted layer in the alloy subsurface layer after the alloy in Table 7 of the present invention has been oxidized for 300 h.

[0072] Table 9

[0073]

Oxidation temperature (°C)

Oxidation time (h)

Deplet...

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Abstract

The invention relates to a Re / Ru-containing monocrystal nickel-based superalloy with high temperature resistant capability and high creep resistance, belonging to a new material with a special purpose. The alloy consists of the following components in percentage by weight: 5.6-6.4% of Al, 7.2-8.2% of Ta, 2.2-3.2% of Cr, 2.5-3.5% of Mo, 6.5-7.5% of Co, 3.8-4.6% of W, 4.2-4.8% of Re, 2.8-3.5% of Ru, 0.05-0.15% of Hf and the balance of nickel. The monocrystal nickel-based superalloy has good high-temperature oxidation resistance and the advantages of high temperature resistant capability, high creep strength, long service life and the like, and is applicable to the production of blades of the hot-end components of aero-engines and gas turbines.

Description

Technical field: [0001] The invention relates to a nickel-based superalloy containing Re / Ru with high temperature bearing capacity and high creep resistance. The alloy is especially suitable for manufacturing hot end single crystal parts of advanced aeroengines and gas turbines. Background technique: [0002] Single crystal nickel-based superalloys are developed on the basis of ordinary casting and directional solidification processes. The single crystal alloy formed by directional solidification eliminates the grain boundaries perpendicular to and parallel to the applied stress axis, and there are no problems such as high temperature grain boundary weakening and longitudinal grain boundary cracks, which improves the thermal fatigue performance of the alloy. The alloying feature is that no grain boundary strengthening elements are added, the alloy composition is simple, the initial melting temperature of the alloy is greatly increased, and a higher solution treatment tempera...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22F1/10C30B29/52
Inventor 田素贵尚丽娟舒德龙苏勇肖丽
Owner SHENYANG POLYTECHNIC UNIV
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