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Prediction method of long-term aging performance degradation of high-Nb type GH4169 alloy

A GH4169, performance prediction technology, applied in the direction of prediction, data processing application, calculation, etc., can solve problems such as limiting the accuracy of service life of alloys, the law of tissue degradation, and the complexity of performance evolution, so as to improve efficiency, safety, reliability and accuracy and engineering value effects

Active Publication Date: 2016-02-24
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the degree of alloying increases, the microstructure degradation law and performance evolution of materials during service become more complex, which greatly limits the accuracy of alloy service life derivation.

Method used

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  • Prediction method of long-term aging performance degradation of high-Nb type GH4169 alloy
  • Prediction method of long-term aging performance degradation of high-Nb type GH4169 alloy
  • Prediction method of long-term aging performance degradation of high-Nb type GH4169 alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Performance (hardness) prediction and stability analysis of high-Nb type GH4169 superalloy at high temperature 720°C for long-term aging for 10,000 hours. The composition of the superalloy is C: 0.03; Cr: 18.0; Ni: 53.5; Co: 0.004; Mo: 3.1; Al : 0.5; Ti: 1.1; Nb: 5.5; B: 0.004; P: 0.015; Within 10000h. Design the following long-term aging experiment:

[0047] Long-term aging time length t (unit: h / hour): 30, 100, 200, 500, 1000, 2000, 3000, 4000, 5000, 7000, 10000;

[0048] Long-term aging service temperature: 720°C.

[0049] The experimental results (t 1 ,P 1 , t 2 ,P 2 、......t m ,P m , the actual experimental results are shown in Table 1, figure 2 The microstructure characteristics of the alloy after long-term aging of 10000h are shown: the interior is mainly composed of long needle-shaped δ phase and matrix phase.

[0050] Table 1 Performance and hardness test values ​​of high Nb type GH4169 superalloy during long-term aging at 720℃ for 10000h

[0051] ...

Embodiment 2

[0059] Performance (hardness) prediction and stability analysis of high-Nb type GH4169 superalloy aged at high temperature 700°C for 5000 hours. The composition of the superalloy is C: 0.03; Cr: 18.0; Ni: 53.5; Co: 0.004; Mo: 3.1; Al : 0.5; Ti: 1.1; Nb: 5.5; B: 0.004; P: 0.015; Within 10000h. Design the following long-term aging experiment:

[0060] Long-term aging time length (h / hour): 30, 100, 200, 500, 1000, 2000, 3000, 4000, 5000;

[0061] Long-term aging service temperature: 700°C.

[0062] P=A 0 +A 1 *exp[-(t-A 2 ) / A 3 ]t≤500h;

[0063] P=A 4 +A 5 *exp[-(t-A 6 ) / A 7 ]500h

[0064] Table 3 Performance and hardness test values ​​of high Nb type GH4169 superalloy during long-term aging at 700℃ for 5000h

[0065]

[0066] According to the performance degradation prediction method in the long-term aging process given above, the experimental results (as shown in Table 3) are processed, and the following equation can be obtained:

[0067]

[0068] A...

Embodiment 3

[0073] Performance (hardness) prediction and stability analysis of high-Nb type GH4169 superalloy aged at high temperature 650°C for 4000 hours. The composition of the superalloy is C: 0.03; Cr: 18.0; Ni: 53.5; Co: 0.004; Mo: 3.1; Al : 0.5; Ti: 1.1; Nb: 5.5; B: 0.004; P: 0.015; Within 10000h. Design the following long-term aging experiment:

[0074] Long-term aging time length (h / hour): 30, 100, 200, 500, 1000, 2000, 3000, 4000;

[0075] Long-term aging service temperature: 650°C.

[0076] Table 5 Performance and hardness test values ​​of high Nb type GH4169 superalloy during long-term aging at 650℃ for 5000h

[0077]

[0078] According to the performance degradation prediction method in the long-term aging process given above, the experimental results (as shown in Table 5) are processed, and the following equation can be obtained:

[0079]

[0080] According to the least squares theory, the experimental value and the calculated value are fitted and verified, and the...

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Abstract

The invention provides a prediction method of the long-term aging performance degradation of high-Nb type GH4169 alloy. The method takes the long-term aging post-tissue of the alloy and the performance data of the long-term aging post-tissue of the alloy as a basis, and parameters, aging temperature T, aging time t and a hardness value of the alloy in a long-term aging process of the alloy are represented as a predictable function relationship. The predication method is suitable for hardness predication in the long-term aging process of the alloy and can provide reference data for designing and using the alloy. The prediction method is realized in the following steps: 1) carrying out heat treatment on the alloy; 2) implementing long-term aging experiments of different temperatures and time; and 3) constructing and verifying a long-term aging performance prediction model. When the method disclosed by the invention is adopted, the long-term tissue and performance of the alloy can be more accurately predicted, and a life prediction basis is provided for the use of the type of alloy. The prediction method can be applied to performance prediction in the long-term aging process of the hot-end component of the high-Nb type GH4169 alloy of the aerospace field.

Description

technical field [0001] The invention belongs to the technical field of life evaluation of superalloys, and in particular provides a method for predicting long-term aging performance degradation of high-Nb type GH4169 superalloys. Background technique [0002] Due to its excellent mechanical properties, good thermal process and welding performance, GH4169 alloy is widely used in various fields such as aviation, aerospace, petroleum, chemical industry and energy, and occupies an absolute dominant position among many deformed superalloys in the world [Zhuang Jingyun. Deformation high temperature Alloy GH4169[M]. Metallurgical Industry Press, 2006:123-126.]. GH4169 alloy is a precipitated nickel-based superalloy with γ″ phase as the main strengthening phase. After standard heat treatment, the main phases at high temperature are γ″ phase, γ′ phase, δ phase and MC phase. Among them, the diffuse distribution of the metastable γ″ phase plays a major strengthening role in the matrix...

Claims

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Application Information

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IPC IPC(8): G06Q10/04C22F1/10C22C19/05
CPCC22C19/055C22F1/10G06Q10/04
Inventor 姚志浩董建新赵薇张麦仓倪童伟
Owner UNIV OF SCI & TECH BEIJING
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