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A third-generation nickel-based single crystal superalloy with stable structure and its preparation method

A nickel-based single crystal, superalloy technology, applied in the field of superalloys, can solve the problems of weakening the effect of alloy performance improvement, alloy initial melting, heat treatment temperature increasing heat treatment time and other problems, achieving good microstructure stability, low Re content, and reducing alloys cost effect

Active Publication Date: 2021-08-13
苏州高晶新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Raising the temperature of heat treatment and increasing the time of heat treatment are the main ways to promote the diffusion of elements, which is conducive to weakening segregation, but when the temperature is too high, the alloy will undergo local initial melting, which will destroy the continuity of the single crystal structure and easily lead to cracks here. sprout
At the same time, sufficient heat treatment of the alloy is conducive to improving the mechanical properties, but continuing to increase the heat treatment temperature and heat treatment time will weaken the effect of improving the properties of the alloy.
The literature "W.S.Walston.Superalloys 1996, p.27-34" records that the optimal solid solution system of RenéN6 alloy is: 1315-1335℃ / 6h, and the research shows that increasing the solid solution time has no effect on the precipitation of TCP phase, but on creep In terms of deformation properties, the creep properties at 1093°C and 983°C are both improved slightly, so the author believes that it is necessary to comprehensively consider the structural stability, mechanical properties and heat treatment cost, even if the stability of the alloy structure does not reach the ideal state, excessive Increased solution time is not necessary

Method used

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  • A third-generation nickel-based single crystal superalloy with stable structure and its preparation method
  • A third-generation nickel-based single crystal superalloy with stable structure and its preparation method
  • A third-generation nickel-based single crystal superalloy with stable structure and its preparation method

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preparation example Construction

[0072] The preparation process of this embodiment is:

[0073] Step 1, prepare master alloy ingot:

[0074] Carry out batching according to the alloy composition described in Table 1. Master alloys were prepared by vacuum induction melting using conventional methods. The alloy is refined at 1540°C to 1580°C for 5 minutes. After refining, cool down to 1500°C to 1540°C and cast. get the size as master alloy ingots.

[0075] The obtained master alloy ingot was polished to remove scale, and was used to prepare single crystal rod after ultrasonic cleaning with alcohol.

[0076] Step 2, prepare single crystal test rod:

[0077] The single crystal test rod was prepared in a directional solidification furnace by adopting the seed crystal method + spiral crystal selection method in the prior art.

[0078] The cleaned master alloy block is placed in the crucible, the draft tube is placed under the crucible, and the mold shell with the pre-seed crystal is fixed on the crystallizati...

Embodiment 1

[0096] The instantaneous tensile properties of the alloy in Example 1 and the alloy in Example 11 at different temperatures are shown in Table 5.

[0097] table 5

[0098]

[0099] The instantaneous tensile properties at different temperatures of typical third-generation nickel-based single crystal superalloys in the prior art are shown in Table 6.

[0100] Table 6

[0101]

[0102] Comparing the tensile properties of the alloys in Table 5 and Table 6, it can be seen that the alloy of Example 1 with high W content has effectively improved the yield strength and tensile strength of the alloy compared with Example 11. At room temperature, the tensile properties of the alloys of Example 1 and Example 11 are better than those of TMS-75 alloy. At 760 ° C, the yield strength and tensile strength of the alloy in Example 1 reached the highest as figure 2 As shown, the performance of the Example 1 alloy at this temperature is close to that of the TMS-75 alloy at 750°C. At 98...

Embodiment 11

[0109] The performance data of Example 11 under different creep conditions are shown in Table 8.

[0110] The creep performance of table 8 embodiment 11 alloy

[0111] Creep condition Creep life h Elongation% Larson-Miller parameter P 1100℃ / 150MPa 83.6 24.91 30.10 1100℃ / 150MPa 86.2 22.34 30.12 1100℃ / 150MPa 89.4 26.57 30.14 1100℃ / 137MPa 93.1 18.75 30.16 980℃ / 350MPa 68.8 39.42 27.36

[0112] For comparison of the creep curves of Example 1 and Example 11 at 1100°C / 150MPa, see Figure 4 . Comparing the creep curve Curve 9 of the alloy in Example 1 at 1100°C / 150MPa with the creep curve 10 of the alloy in Example 11 at 1100°C / 150MPa, it can be seen that when the Re content is 4wt.%, the W element is added to the alloy , the high temperature mechanical properties of the alloy are significantly improved.

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Abstract

A third-generation nickel-based single crystal superalloy with stable structure and a preparation method thereof. The third-generation nickel-based single-crystal superalloy with stable structure is composed of Al, Ta, W, Re, Mo, Cr, Co, Hf and Ni. The W and the Ni are added in the form of Ni-W master alloy. The invention adopts directional solidification to prepare a single crystal alloy, and undergoes multi-step, high temperature, long-term solid solution homogenization treatment, high temperature aging treatment and low temperature aging treatment, so that the alloy of the present invention has no initial melting and no TCP phase precipitation, and reduces the tendency of TCP precipitation. The alloy with reduced Re content reaches the performance level of the third-generation nickel-based single crystal superalloy, and the obtained nickel-based single crystal superalloy has high medium and high temperature strength and good transient tensile properties and creep properties, and Has good organizational stability.

Description

technical field [0001] The invention relates to the field of superalloys, in particular to a third-generation nickel-based single crystal superalloy with good structural stability and good creep performance and a preparation method thereof. Background technique [0002] Superalloys refer to high-alloyed iron-based, cobalt-based or nickel-based austenitic metal materials that can withstand large complex stresses at high temperatures above 600 °C and have surface stability. Nickel-based single crystal superalloys have superior comprehensive properties and are currently widely used in turbine blades and other components at the hot end of aero-engines. Its temperature bearing capacity is a key technical indicator to measure the engine's mobility and work efficiency. [0003] During the development of nickel-based single crystal superalloys, the improvement of temperature bearing capacity is mainly reflected in the gradual increase of the content of refractory elements Re, W, Ta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C30B11/00C30B29/52C30B33/02C22F1/10
CPCC22C19/057C22F1/10C30B11/00C30B29/52C30B33/02
Inventor 刘林李卓然黄太文
Owner 苏州高晶新材料科技有限公司
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