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Cobalt-based high temperature alloy, preparation method thereof and application in heavy-duty gas turbine

A superalloy and gas turbine technology, which is applied in the field of cobalt-based superalloy and its preparation, can solve the problems such as the inability to meet the design requirements that the inlet temperature of the gas turbine is continuously increased, and achieve the effects of excellent high temperature mechanical properties, high high temperature strength, and excellent oxidation resistance.

Active Publication Date: 2018-08-14
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, my country has correspondingly developed Co-Cr-W(Mo) cast equiaxed cobalt-based superalloys such as K640 and K640s. These alloys have good structural stability and mechanical properties, but gradually cannot meet the continuous increase in the inlet temperature of gas turbines. design requirements

Method used

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  • Cobalt-based high temperature alloy, preparation method thereof and application in heavy-duty gas turbine
  • Cobalt-based high temperature alloy, preparation method thereof and application in heavy-duty gas turbine
  • Cobalt-based high temperature alloy, preparation method thereof and application in heavy-duty gas turbine

Examples

Experimental program
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Effect test

Embodiment 1

[0049] The composition of the alloy in this example (alloy in Example 1) is shown in Table 1, and the preparation process was adopted: melt treatment at 1620°C for 10 minutes, pouring at 1470°C, and shell temperature at 1020°C. Alloy cast structure such as figure 1 As shown, the alloy consists of γ matrix, γ / M 23 C 6 Eutectic, MC and M 23 C 6 carbide composition.

Embodiment 2

[0051] The composition of the alloy in this example (alloy in Example 2) is shown in Table 1, the preparation process adopted is the same as in Example 1, and the tensile properties of the alloy are shown in Table 2. The tensile properties of Mar-M 509 alloy, a typical foreign reburned guide vane material, are shown in Table 3. Through comparison, it can be found that the tensile properties of the alloy of the present invention are slightly higher than that of the Mar-M 509 alloy. Composite curves of thermal strength parameters of comparative alloys ( figure 2 ) It can be seen that the durability performance of the alloy of the present invention at medium and high temperatures is higher than that of the same type of Mar-M 509 equiaxed cobalt-based superalloy.

[0052] The tensile properties of table 2 embodiment 2 alloy

[0053]

[0054] Table 3 Tensile properties of Mar-M 509 alloy

[0055]

Embodiment 3

[0057] The composition of the alloy of this embodiment (the alloy of Embodiment 3) is shown in Table 1, and the preparation process adopted is the same as that of Embodiment 1. The 900°C low cycle fatigue performance of the alloy is as follows: image 3 As shown, it can be seen that the 900°C low cycle fatigue performance of the alloy of the present invention is higher than that of the same kind of Mar-M 509 equiaxed cobalt-based superalloy. at the same time, Figure 4 The hot corrosion weight gain variation curve of the alloy of the present invention at 900°C is shown, and the results show that the hot corrosion resistance of the alloy is equivalent to that of the FSX-414 alloy, and far superior to the hot corrosion resistant equiaxed crystal M38 alloy of the trump card.

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Abstract

The invention discloses a cobalt-based high temperature alloy, a preparation method thereof and application in a heavy-duty gas turbine, and belongs to the technical field of casting isometric crystalcobalt-based high temperature alloy. The alloy comprises chemical compositions of, 22.0-25.0% of Cr, 9.0-11.0% of Ni, 5.4-6.4% of W, 0.7-1.3% of Mo, 3.0-4.0% of Ta, 0.47-0.65% of C, 0.15-0.25% of Ti,0.05-0.2% of Al, 0.06-0.35% of Zr, 0-0.1% of Mn, 0-0.4% of Si, 0.005-0.015% of B, and the balance Co. The cobalt-based high temperature alloy has excellent mechanical properties, physical and chemical properties and high temperature structural stability, and is suitable for heavy-duty gas turbine guide blade materials for ground and ships.

Description

technical field [0001] The invention belongs to the technical field of casting equiaxed cobalt-based high-temperature alloys, and in particular relates to a cobalt-based high-temperature alloy, a preparation method thereof and an application in heavy-duty gas turbines. Background technique [0002] Since the birth of the world's first heavy-duty gas turbine for power generation in Switzerland in 1939, the heavy-duty gas turbine industry has developed rapidly. At present, heavy-duty gas turbines have become the most efficient large-scale commercial power generation mode among all heat-to-power conversion power generation systems. The power generation of gas turbine power stations is close to one-fifth of the global power generation, and it is still increasing steadily. In the gas turbine, the turbine blade is listed as the first key part because it is the part with the highest temperature, the most complex stress and the harshest environment, and is known as the "pearl in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/07C22C1/02
CPCC22C1/02C22C19/07
Inventor 王尧董加胜刘心刚李相伟郑伟李辉楼琅洪
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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