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Directional solidification heat corrosion resistant nickel base cast superalloy and preparation method thereof

A technology of directional solidification and high-temperature alloys, which is applied in the field of improvement of cast high-temperature alloys. It can solve the problems of high alloy cost and inapplicability to gas turbine blades, etc., and achieve the effects of good parallelism, stable structure and excellent comprehensive performance.

Inactive Publication Date: 2009-09-23
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The disadvantages of the above alloys are: from the perspective of mechanical properties, the alloy cannot be used for gas turbine blades with an operating temperature higher than 900°C, and the cost of the alloy is relatively high

Method used

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  • Directional solidification heat corrosion resistant nickel base cast superalloy and preparation method thereof
  • Directional solidification heat corrosion resistant nickel base cast superalloy and preparation method thereof
  • Directional solidification heat corrosion resistant nickel base cast superalloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] By weight percentage, the alloy composition is: C 0.07%; Cr 14.8; Co 9.5%; W 5.1%; Mo 1.8%; Al 3.1%; Ti 4.6%; Hf 0.46%; Ta 0.8%; B 0.08%; Y( Addition amount) 0.015%; Mn 0.18%; Si 0.18%; P 0.006%; S 0.007%; Fe 0.3%;

[0029] Alloy melting and casting: use a 25kg vacuum induction furnace to melt the master alloy, and use the liquid metal cooling (LMC) process for directional solidification, and the vacuum degree of the directional furnace is ≤5×10 -4 mmHg, pouring temperature 1540°C, drawing speed 10mm / min, temperature gradient 100°C / cm, liquid tin temperature 270°C.

[0030] Alloy heat treatment system: 1170°C, heat preservation 4h, air cooling +1050°C, heat preservation 4h, air cooling +850°C, heat preservation 16h, air cooling.

[0031] The main mechanical properties of the alloy:

[0032] Tensile properties at room temperature: σ b 1320MPa; σ 0.2 990MPa; δ 8%; 4.0%.

[0033] Durability: 930℃, stress 270MPa, duration τ 150.5h, δ 20.8%.

[0034] The transvers...

Embodiment 2

[0036] By weight percentage, the alloy composition is: C 0.045%; Cr 14.7; Co 9.2%; W 4.85%; Mo 1.72%; Al 2.85%; Hf 0.35%; Ti 4.35%; Ta 0.4%; B 0.07%; Y( Addition amount) 0.015%; Mn 0.12%; Si 0.10%; P 0.006%; S 0.005%; Fe 0.2%;

[0037] Alloy smelting and casting, using a 25kg vacuum induction furnace to melt the master alloy, and using the liquid metal cooling (LMC) process for directional solidification, the vacuum degree of the directional furnace is ≤5×10 -4 mmHg, pouring temperature 1520°C, drawing speed 8mm / min, temperature gradient 95°C / cm, liquid tin temperature 300°C.

[0038] The heat treatment system is: 1200°C, heat preservation 2h, air cooling +1090°C, heat preservation 2h, air cooling +850°C, heat preservation 24h, air cooling.

[0039] The main mechanical properties of the alloy:

[0040] Tensile properties at room temperature: σ b 1330MPa; σ 0.2 1040MPa; δ 8.0%; 9.5%.

[0041] Durability performance: 930℃, stress 270MPa, τ 117.3h.

Embodiment 3

[0043]In terms of weight percentage, the alloy composition is: C 0.08%; Cr 15.3%; Co 9.9%; W 5.7%; Mo2.2%; Al 3.2%; Ti 4.9%; Hf 0.55%; Ta 1.3%; B 0.09%; Y (addition amount) 0.015%; Mn 0.19%; Si 0.18%; P 0.007%; S 0.008%; Fe 0.4%;

[0044] Alloy melting and casting: use a 25kg vacuum induction furnace to melt the master alloy, and use the liquid metal cooling (LMC) process for directional solidification, and the vacuum degree of the directional furnace is ≤5×10 -4 mmHg, pouring temperature 1500°C, drawing speed 12mm / min, temperature gradient 110°C / cm, liquid tin temperature 270°C.

[0045] Alloy heat treatment system: 1170°C, heat preservation 4h, air cooling +1050°C, heat preservation 4h, air cooling +850°C, heat preservation 16h, air cooling.

[0046] Tensile properties at room temperature: σ b 1340MPa; σ 0.2 1110MPa; δ 5.5%; 7.5%.

[0047] Durability performance: 930℃, stress 270MPa, τ124.8h.

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Abstract

The invention relates to a low-cost directionally solidified hot-corrosion-resistant nickel-based cast superalloy with excellent performance. The chemical composition range (weight%) of the alloy is: C 0.04-0.09; Cr 14.5-15.3; Co 9.0-9.9; W 4.7-5.9 ; Mo 1.6-2.3; Al 2.8-3.3; Ti 4.2-5.0; Hf 0.3-0.6; Ta 0.3-1.5; B 0.06-0.10; S≤0.008; Fe≤0.5; Ni surplus. The master alloy is smelted in a vacuum induction furnace, and the columnar crystal alloy is prepared by directional solidification in a liquid metal cooling (LMC) furnace. The vacuum degree of the directional furnace is ≤5×10-4mmHg, the pouring temperature is 1480-1570°C, and the pulling speed is 3-15mm. / min, temperature gradient 95-145°C / cm, liquid tin temperature 250-350°C. The present invention provides a kind of Ta-containing, but does not contain alloying element Re (low cost), Nb, Zr and Ce, and the thermal corrosion resistance superalloy with stable structure, compares with чC88y-Bи, tensile strength (σb, σ0.2 ) is increased by more than 30%, and the plasticity is obviously improved. Under the same stress condition, the persistent temperature is increased by 30°C, which is suitable for making gas turbine blades for 930°C.

Description

Technical field: [0001] The invention relates to an improved technology for casting high-temperature alloys, in particular to a low-cost directional solidification and heat-corrosion-resistant nickel-based casting high-temperature alloy and a preparation method thereof. Background technique: [0002] The document Паспорт По Оплав ЧС88у-Ви (instructions for alloy ЧС88у-Ви) pointed out that the chemical composition specified in the alloy technical conditions (Ту 14-1-4828-90) is: C 0.04-0.09%; Cr15.4-16.3%; Co 10.0-11.5%; Mo 1.6-2.3%; W 4.7-5.9%; Al 2.8-3.3%; Ti 4.2-5.0%; Nb 0.1-0.3%; Hf 0.2-0.4%; B 0.06-0.10%; Zr( Addition) 0.03%; Y (addition) 0.03%; Ce (addition) 0.015%; Si≤0.3%; Mn≤0.3%; S≤0.008%; P≤0.008%; Fe≤0.5%; [0003] The alloy adopts ordinary precision casting process to prepare gas turbine turbine blades, and its structure is equiaxed crystal, which is used to manufacture turbine moving blades whose working temperature is not higher than 900°C. [0004] The heat ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22C1/02B22D27/00C22F1/10
CPCC22C19/056
Inventor 郭建亭周兰章侯介山袁超赖万慧秦学智
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI