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High plasticity superhigh temperature niobium-based directionally solidified alloy and preparation method thereof

An ultra-high temperature, high plasticity technology, applied in chemical instruments and methods, crystal growth, single crystal growth, etc., can solve problems such as low toughness, low density, and limited applications, and achieve wide heat treatment window, good plasticity, and good process performance Effect

Active Publication Date: 2013-09-11
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

On the other hand, Nb intermetallic compounds (such as Nb 3 Si, Nb 5 Si 3 and Cr 2 Although Nb, etc.) also have properties such as low density, high elastic modulus, and high melting point similar to pure metal Nb, the inherent low toughness of intermetallic compounds limits its application in structural parts such as aircraft engines.

Method used

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  • High plasticity superhigh temperature niobium-based directionally solidified alloy and preparation method thereof
  • High plasticity superhigh temperature niobium-based directionally solidified alloy and preparation method thereof
  • High plasticity superhigh temperature niobium-based directionally solidified alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In this example, the vacuum non-consumable melting master alloy is used, and the composition is shown in Table 3-5; the temperature gradient range of the directional solidification furnace is 40K / cm, the pouring temperature is 1600°C, the mold shell temperature is consistent with the pouring temperature, and the drawing rate is Super high temperature alloy test rods were prepared in the range of 8mm / min. The phase composition of the alloy as-cast sample is as follows: figure 1 Table 6 shows the microhardness values ​​of each phase of as-cast matrix and strengthening phase.

[0039] Table 3 (wt%)

[0040] C

B

Al

f

Ti

Si

Cr

Ta

Nb

0.015

0.05

5.0

2.2

26

4.6

6.0

2.5

Remain

[0041] Table 4 residual elements (wt%)

[0042] the element

Cu

Fe

mn

Zr

Ni

W

O

N

S

P

content

0.08

0.42

0.1...

Embodiment 2

[0049] The master alloy is melted in a vacuum non-consumable melting furnace, and its composition is shown in Table 7-9. The samples of niobium-based directional alloy were prepared by HRS method in ZGG-0.02 directional solidification furnace. The temperature gradient range of the directional solidification furnace is 60K / cm, the pouring temperature is 1650°C, the shell temperature is consistent with the pouring temperature, and the pulling rate of the directional solidification single crystal growth is 4mm / min. The mechanical properties of the directional solidification test bar are tested in the cast state, and the compression performance curve is as follows: figure 2 and image 3 shown.

[0050] Table 7 (wt%)

[0051] C

[0052] Table 8 residual elements (wt%)

[0053] the element

[0054] Table 9 Trace elements (ppm)

[0055] the element

[0056] It can be seen from the figure that the alloy has a high compressive strength in the as-ca...

Embodiment 3

[0058] The master alloy is smelted in a vacuum non-consumable melting furnace, and its composition is shown in Table 10-12. The samples of niobium-based directional alloys were prepared by ultra-high temperature and high-speed directional solidification in a directional solidification furnace. The temperature gradient range of the directional solidification furnace is 80K / cm, the pouring temperature is 1700°C, the shell temperature is consistent with the pouring temperature, and the directional drawing rate is 6mm / min. The mechanical properties of the directional solidification test bar are tested in the cast state, and the compression performance curve is as follows: Figure 4 and Figure 5 shown.

[0059] Table 10 (wt%)

[0060] C

[0061] Table 11 Residual elements (wt%)

[0062] the element

[0063] Table 12 Trace elements (ppm)

[0064] the element

[0065] Depend on Figure 4 It can be seen that at 800°C, the alloy still has high str...

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Abstract

The invention relates to the field of high plasticity superhigh temperature metal materials and specifically to a high plasticity superhigh temperature niobium-based directionally solidified alloy used as a material for a turbine blade and a preparation method thereof. The alloy, as a niobium-based directionally solidified turbine blade material with the advantages of low cost, high plasticity and high strength at a superhigh temperature, comprises the following components by weight, C 0.015 to 0.2, B 0.005 to 0.05, Si 1.2 to 4.6, Cr 4.0 to 8.0, Al 2.0 to 5.0, Ti 22 to 26,Ta 2.0 to 3.0 and Hf 0.4 to 4.0, with the balance being Nb and unavoidable residual elements and trace elements. The preparation method comprises the steps of mother alloy melting and directional solidification, and during directional solidification, temperature gradient of a single crystal growth directional solidification furnace is in a range of 40 K / cm to 80 K / cm, a casting temperature is 1600 to 1700 DEG C, a shuttering temperature and the casting temperature are identical, and a single crystal blade or test bar is prepared under the condition that a single crystal growth withdrawing rate is in a range of 4 to 8 mm / min.

Description

technical field [0001] The invention relates to the field of high-plasticity ultra-high temperature metal materials, in particular to a high-plasticity ultra-high temperature niobium-based oriented alloy used for turbine working blade materials and a preparation method thereof. Background technique [0002] With the development of aerospace technology, ultra-high temperature metal structural materials with higher temperature bearing capacity and better comprehensive performance are required. The maximum surface temperature of nickel-based superalloy blades is about 1150 °C, but future designs require materials to work above 1300 °C. Nb-based solid solution alloys (such as C103) have been widely used in the aerospace field due to their high melting point, moderate density, and certain high-temperature strength, but this alloy is not suitable for use in the aerospace field because of its poor oxidation resistance and High temperature strength still needs to be further improve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/02C22C1/03C30B29/52
Inventor 于金江孙晓峰杨彦红金涛侯桂臣管恒荣胡壮麒
Owner 辽宁红银金属有限公司
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