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Directional solidification nickel-base high-temperature alloy and heat treatment process thereof

A nickel-based high-temperature alloy, directional solidification technology, applied in the field of guide vane materials, can solve the problems of vane damage, large thermal load of the vane, etc., and achieve the effects of increased durable life, improved thermal fatigue performance, and uniform composition

Active Publication Date: 2008-02-13
辽宁红银金属有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially when the combustion chamber is unevenly burned and the work is poor, the heat load on the first-stage guide vanes is greater, which is often the main reason for the premature failure of the guide vanes

Method used

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  • Directional solidification nickel-base high-temperature alloy and heat treatment process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The alloy is melted in a vacuum induction furnace. The refining temperature is 1550℃~1600℃, the refining time is 5min~10min, and the vacuum degree is 10 -1 ~10 -2 Pa, the pouring temperature is 1450℃~1500℃.

[0026] The alloy composition of this embodiment is shown in Table 1. The density of the alloy is 8.10g / cm 3 , The initial melting temperature measured by DTA is 1348°C. Table 2 lists the density and initial melting temperature of some common guide vane materials in China. Among them, K417G is a polycrystalline nickel-based superalloy, DZ4 is a oriented nickel-based superalloy, DZ40M is a cobalt-based oriented superalloy, and DD4 is a single crystal superalloy. It can be seen that the alloy has a lower density and a higher initial melting temperature than other guide vane materials.

[0027] Table 1 Composition (percentage by weight) of the alloy of Example 1

[0028] B

C

Cr

co

Al

Nb

Mo

W

Y

Ni

...

Embodiment 2

[0032] The alloy composition of this example is the same as that of Example 1. Table 3 lists the thermal fatigue properties of the test alloy of the present invention and DZ40M (oriented cobalt-based superalloy). It can be seen from the table that the cold and hot fatigue performance of this alloy is better than that of DZ40M.

[0033] Table 3 Cold and hot fatigue properties of the tested alloys

[0034] Test conditions

[0035] Note: The number of cycles when the crack length is 0.2mm is taken as the number of crack initiation

Embodiment 3

[0037] The alloy composition of this example is the same as that of Example 1. Table 4 shows the segregation ratio of different elements in the dendrite stem and between dendrites. It can be seen from Table 4 that in the as-cast alloy, the distribution of elements between dendrites and dendrite stems is uneven. Co, W and other elements are more in the dendrites, while Al, Nb, Mo are more in the dendrites. After the alloy is heat treated, the difference in the composition of each element is reduced, that is, the distribution of the elements in the entire alloy is more uniform. Table 5 shows the distribution of each element in the γ and γ′ phases. It can be seen from Table 5 that the content of Cr, Co and Mo is more in the γ phase, and that of Al and Nb is more in the γ′. After the alloy is heat treated, W and Mo are partially reduced in the two phases, and the distribution of γ forming elements Cr, Co and γ′ forming elements Al and Nb is more reasonable, which makes the compo...

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Abstract

The invention relates to a directionally solidified nickel-based superalloy and a heat treatment process thereof. In particular, it provides a guide vane material with low density, low cost, high initial melting temperature, good oxidation corrosion resistance and thermal fatigue performance. And a heat treatment process to improve the alloy's tensile properties, durability and thermal fatigue properties. Alloy composition (percentage by weight) of the present invention: B 0.003~0.03, C 0.02~0.2, Cr 8.0~10.0, Al 4.5~6.5, Co 4.0~12.0, Nb 1.8~2.5, W 2.5~4.5, Mo 2.5~4.5, Y 0.005~0.05, more than Ni. The heat treatment process of the present invention: (1) at a temperature of 1210°C to 1240°C, heat preservation for 3h to 5h, and air-cool to room temperature; (2) at a temperature of 1040°C to 1080°C, heat preservation for 3h to 5h, and air cooling to room temperature; ( 3) At a temperature of 850°C to 900°C, keep warm for 16h to 32h, and air cool to room temperature. The alloy of the invention has the characteristics of low density, low cost, high initial melting temperature, good oxidation corrosion resistance and thermal fatigue performance, and is suitable for directional nickel-based guide vane materials.

Description

technical field [0001] The invention relates to a directionally solidified nickel-based superalloy and a heat treatment process thereof. In particular, it provides a guide vane material with low density, low cost, high initial melting temperature, good oxidation corrosion resistance and thermal fatigue performance. And a heat treatment process for improving the alloy's mechanical properties, structure stability and cold and heat fatigue performance. Background technique [0002] In advanced aero-engines, the total amount of high-temperature alloys accounts for 40%-60% of the total amount of materials. With the continuous development of aviation and aerospace, higher requirements are put forward for aero-engine materials. Guide vanes are one of the most thermally impacted parts of a turbine engine. Especially when combustion is uneven in the combustion chamber and the work is poor, the heat load on the first-stage guide vanes is greater, which is often the main reason for t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/07C22C1/10
Inventor 孙晓峰于金江管恒荣夏鹏成金涛赵乃仁侯桂臣周鹏杰胡壮麒
Owner 辽宁红银金属有限公司
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