Heat treatment method of nickel-based single-crystal superalloy

A heat treatment method and superalloy technology, applied in the field of superalloys, can solve the problems of increasing the manufacturing cost of the fourth-generation single crystal blade, reducing the degree of uniformity of the alloy structure, affecting the diffusion of alloy elements, etc., achieving good application prospects, improving comprehensive performance, Low segregation effect

Active Publication Date: 2021-10-22
HEBEI GANGYAN DEKAI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the addition of high content of Re and Ru elements, the density of these fourth-generation single crystal alloys is relatively high, generally 9.05g / cm 3 above; moreover, Re and Ru belong to precious metal elements, and their large additions in the alloy greatly increase the manufacturing cost of the fourth-generation single crystal blades.
[0004] In the nickel-based single crystal superalloy in the prior art, with the increase of the content of refractory elements, not only the cost increases, but also the diffusion of each element in the alloy is affected, and the eutectic phase is prone to appear in the alloy structure, making the structure of the alloy uniform The degree of optimization is reduced, and the overall performance is affected

Method used

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  • Heat treatment method of nickel-based single-crystal superalloy
  • Heat treatment method of nickel-based single-crystal superalloy
  • Heat treatment method of nickel-based single-crystal superalloy

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Effect test

Embodiment 1

[0048] Embodiment 1. preparation single crystal test bar

[0049] Master alloys were prepared using the single crystal synthesis compositions shown in Table 1 below, and then single crystal test rods were drawn.

[0050] Table 1. DD476 alloy composition (wt.%)

[0051]

[0052] After the DD476 master alloy was smelted in a high vacuum induction furnace, the single crystal test rod for the test was drawn at 1550 °C at a rate of 3 mm / min by the spiral crystal selection method.

Embodiment 2

[0053] Embodiment 2. Research and testing of properties and microstructure of the alloy

[0054] 2.1 Alloy differential scanning calorimetry analysis

[0055] Carry out DSC curve analysis to the alloy of the present invention, heating rate is 10 ℃ / min, is heated from room temperature to 1450 ℃ and is lowered to room temperature by the same rate, and alloy endothermic curve is as follows figure 1 shown.

[0056] According to the figure, it can be seen that the temperature at which the interdendritic γ’ starts to dissolve is T 0 (1220°C), γ / γ' eutectic transition temperature T 1 (1312.7°C), liquidus T L (1414.7°C), the extrapolated solidus temperature is T S (1384.3°C).

[0057] 2.2 γ' solid solution temperature

[0058] According to JmatPro simulation calculation, the γ' solid solution temperature of DD476 single crystal is about 1284.39°C (see figure 2 ), so three heat treatment regimes were set up to explore the actual solution temperature of the alloy γ’. The three ...

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Abstract

The invention provides a heat treatment method of a nickel-based single-crystal superalloy, and relates to the technical field of superalloys. The heat treatment method comprises the following steps that a nickel-based single-crystal superalloy casting is subjected to first-stage heat treatment at 1280-1300 DEG C, then subjected to second-stage heat treatment at 1330-1350 DEG C, heated to 1360-1380 DEG C, subjected to third-stage heat treatment and finally subjected to cooling treatment. According to the method, the upper limit temperature of a heat treatment window of the alloy is increased to 1380 DEG C from 1340 DEG C through a three-stage heat treatment system, the solid solution heat treatment window of the alloy is expanded, the highest heat treatment temperature of solid solution heat treatment is increased, the homogenization degree of all elements (especially Re, W and other elements) of the DD476 alloy is greatly improved, and the performance of a single-crystal alloy is improved.

Description

technical field [0001] The invention relates to the technical field of superalloys, in particular to a heat treatment method for a nickel-based single crystal superalloy. Background technique [0002] Nickel-based single crystal superalloys are important materials in aeroengines. With the continuous improvement of the generation of single crystal superalloys, more Re elements are added to single crystal superalloys, which reduces the structural stability of the alloys and increases the density of the alloy. In addition, when the alloy is loaded at high temperature for a long time, it is easy to form harmful needle-like or flake-like TCP phases. The formation of TCP phase leads to the reduction of the durable life of the single crystal superalloy, and the deterioration of plasticity and toughness, which seriously affects the performance of the turbine blade. In response to this problem, the United States, Britain, Japan and other countries have developed the fourth-generati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10C22C1/02C22C19/03C30B29/52C30B33/02
CPCC22F1/10C22C1/023C22C19/057C30B29/52C30B33/02
Inventor 曾强陈旭辉吴保平王凯李维
Owner HEBEI GANGYAN DEKAI TECH CO LTD
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