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Heat treatment method for regulating and controlling nickel-based powder superalloy microstructure

A heat treatment method and high temperature alloy technology, which can be used in heat treatment equipment, heat treatment process control, metal processing equipment, etc., and can solve problems such as unfavorable alloy strength and coarsening of γ' phase.

Active Publication Date: 2021-08-27
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, slow cooling can cause the coarsening of the γ′ phase, which is detrimental to the strength of the alloy

Method used

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  • Heat treatment method for regulating and controlling nickel-based powder superalloy microstructure
  • Heat treatment method for regulating and controlling nickel-based powder superalloy microstructure
  • Heat treatment method for regulating and controlling nickel-based powder superalloy microstructure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Prepare alloy one: the composition is C 0.05, Cr12.7, Co20.4, Mo3.8, W2.1, Al3.5, Ti3.7, Ta2.4, Nb0.9, Zr0.045, B 0.02, Ni Amount of prepared nickel-based powder superalloy.

[0043] DSC analysis was carried out on Alloy 1, from figure 2 In the left figure (a), it can be seen that during the heating process, the endothermic peak gradually rises to the peak in a wide temperature range, and then quickly falls back to the baseline. The melting temperature of the γ′ phase in the as-prepared alloy was determined to be 1166°C as measured in the figure. figure 2 The figure on the right (b) is the DSC curve during the cooling process of the as-prepared alloy, and the cooling rate is 5°C / min. image 3 In order to calculate the γ′ phase precipitation percentage and phase transformation rate curve at different temperatures through DSC curve calculation. The heat treatment process selects the over-solution treatment temperature as 1190°C, and the over-solution holding time as ...

Embodiment 2

[0046]Select Alloy 1 as the raw material; the heat treatment process selects the over-solution treatment temperature as 1190°C, and the over-solution holding time as 2h; then slowly cools to 1140°C at a cooling rate of 5°C / min, so that about 5% of the The γ′ phase nucleates preferentially near the grain boundary, and the γ′ phase that nucleates preferentially grows up to promote the formation of the zigzag grain boundary after being kept for 60 minutes; finally, the fine γ′ phase is precipitated in the grain by air cooling.

[0047] The heat treatment parameters of Example 2 are shown in Table 1, and the sample grain boundaries and intragranular γ' phase morphology of alloy one after heat treatment are shown in Figure 5 , the grain boundary of the alloy is jagged, the amplitude of the zigzag grain boundary is 1.84 μm, and the average size of the intragranular γ′ phase is 30.4 nm, as shown in Table 2.

Embodiment 3

[0051] Prepare Alloy 2: Composition of C 0.05, Cr13.1, Co21.6, Mo4.0, W1.9, Al3.3, Ti3.4, Ta2.7, Nb0.8, Hf 0.5, Zr0.036, B 0.02 , Ni balance prepared nickel-based powder superalloy.

[0052] Carry out DSC analysis to alloy 2, from Figure 7 From the figure (a) on the left, it can be obtained that the dissolution temperature of the γ′ phase in alloy 2 is 1170°C. Figure 7 The right figure (b) is the DSC curve during the cooling process of alloy 2, and the cooling rate is 5°C / min. Figure 8 In order to calculate the γ′ phase precipitation percentage and phase transformation rate curve at different temperatures through DSC curve calculation. Select the over-solution treatment temperature as 1200°C, and the over-solution holding time as 1h; then slowly cool to 1110°C at a cooling rate of 5°C / min, so that about 70% of the γ′ phase is preferentially near the grain boundary during the slow cooling process. Nucleation, heat preservation for 10min to make the preferentially nucleate...

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Abstract

The invention discloses a heat treatment method for regulating and controlling a nickel-based powder superalloy microstructure. The heat treatment method comprises the following steps that solid solution treatment is carried out at the temperature 5-60 DEG C higher than the gamma' phase dissolution temperature for 15 minutes to 6 hours; then cooling is carried out to an intermediate temperature at a cooling rate of 0.1-30 DEG C / min, so that the pre-precipitated gamma' phase preferentially nucleates near the grain boundary, and the intermediate temperature is a temperature corresponding to 1%-70% of the precipitation percentage of the gamma' phase; then heat preservation treatment is carried out at the intermediate temperature for 5-120 minutes, so that a gamma' phase which is preferentially nucleated near a grain boundary grows up to promote the formation of a sawtooth grain boundary; and finally, air-cooling is carried out to room temperature to separate out fine gamma' phase in the crystal. The amplitude of the sawtooth grain boundary and the size of the intragranular gamma' phase are effectively regulated and controlled by changing the intermediate temperature and the heat preservation time, so that the microstructure with the sawtooth grain boundary and the fine gamma' phase is obtained.

Description

technical field [0001] The invention belongs to the field of heat treatment of nickel-based powder superalloys, and in particular relates to a heat treatment method for regulating the microstructure of nickel-based powder superalloys. Background technique [0002] Nickel-based powder superalloys have excellent comprehensive properties at room temperature and high temperature, such as high strength, high ductility, excellent fracture toughness, and good fatigue and corrosion resistance. Due to these unique properties, they have been widely used in some key technical fields and are the preferred materials for high thrust-to-weight ratio aeroengine turbine disks. In order to improve the service life of the turbine disk, it is necessary to further control the microstructure of the nickel-based powder superalloy. The creep performance of the alloy can be improved and the crack growth rate can be reduced by forming the zigzag grain boundary, so that the creep life of the alloy is...

Claims

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Application Information

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IPC IPC(8): C22F1/10B22F1/00C21D11/00
CPCC22F1/10C21D11/005C21D11/00B22F1/142
Inventor 刘彤吴忧张圆圆李吉康
Owner BEIHANG UNIV
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