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Weldable Cast Superalloys and Their Applications

A superalloy and post-welding technology, applied in the field of casting superalloys, can solve the problem of not being able to balance high-temperature performance, mechanical properties, casting process performance, and welding performance at the same time.

Active Publication Date: 2021-12-07
HEBEI GANGYAN DEKAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first purpose of the present invention is to provide a weldable cast superalloy to solve the technical problem that the superalloy material in the prior art cannot simultaneously balance high temperature performance, mechanical performance, casting process performance and welding performance, etc.

Method used

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  • Weldable Cast Superalloys and Their Applications
  • Weldable Cast Superalloys and Their Applications
  • Weldable Cast Superalloys and Their Applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~7

[0059] Examples 1 to 7 respectively provide weldable cast superalloys 1# to 7# and their preparation methods. Specifically, the weldable cast superalloys are prepared from the raw materials listed in Table 1 and their contents.

[0060] Table 1 Composition ratios of different weldable cast superalloys (mass percent %)

[0061]

[0062] Concrete preparation method comprises the following steps:

[0063] (1) Prepare the raw materials according to the composition content listed in Table 1 and the element ratio of the superalloy, and use the vacuum induction melting process to obtain ingots;

[0064] (2) The ingot was remelted in a vacuum induction melting furnace to prepare a corresponding weldable cast superalloy test rod.

[0065] The prepared test rods were heat treated respectively, and the heat treatment system was 1120°C×4h / air cooling+900°C×5h / air cooling.

experiment example 1

[0071] Characterize the microstructure of the test bar after the heat treatment obtained by 1#, 2# of the embodiment of the present invention, 2# and comparative examples of 8#, 9#, 10# and 14#, and the corresponding metallographic photographs are respectively as follows Figure 1~Figure 6 shown. It can be seen from the figure that when Mg and Ce elements are added to the alloy, the corners of the carbides precipitated at the grain boundaries of the alloy are relatively round and blunt, and are mainly distributed in an island chain shape, which improves the performance of the alloy to a certain extent.

[0072] Moreover, the microstructures of the solid solution state (1120°C×4h / air cooling) of some alloys in the examples and comparative examples of the present invention are as follows: in the 2# of the example, the large-grain precipitated phase accounts for 0.043%, of which 2μm~ The 5μm massive MC particles accounted for 0.02%~0.035% and the 5μm~10μm blocky μ phase accounted...

experiment example 2

[0079] Argon arc welding performance

[0080] Referring to the 1# alloy composition batch of Example 1, a test piece was made, and welded by argon arc welding, and the welding condition parameters were: welding current 80A, welding voltage 18V. Welded samples with a thickness of 2 mm were solution treated and then subjected to tensile tests, while unwelded test pieces with a thickness of 2 mm were taken for solution treatment and then subjected to tensile tests as the body comparative experimental data. The test results are shown in Table 4.

[0081] Table 4 Tensile properties of argon arc welding test piece and unwelded body at room temperature

[0082]

[0083] Figure 7 It is the metallographic structure diagram of the fracture of the sample after argon arc welding. It can be seen from the figure that the structure of the alloy weld is uniform, and the interface between the weld and the body is smooth. Figure 8 It is the scanning image of the energy spectrum of the sa...

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Abstract

The invention relates to the technical field of superalloy materials, in particular to a weldable cast superalloy and its application. Weldable cast superalloys include: C 0.05%~0.08%, Cr 17%~20%, Mo 9%~11%, W 4%~5%, Ti 2.2%~2.8%, Al 1 %~1.5%, Ce 0.01%~0.03%, Mg 0.01%~0.03%, Fe 0.01%~4%, Mn 0.01%~0.5%, Si 0.1%~0.6%, B≤0.02%, S≤0.01%, P≤0.015%, the balance is Ni and unavoidable impurities. The weldable cast high-temperature alloy of the invention can balance the high-temperature performance, mechanical performance, casting performance and welding performance of the alloy, meet the stringent requirements of the turbofan engine used in missiles, and can be used to manufacture engine tail nozzles and other components.

Description

technical field [0001] The invention relates to the technical field of superalloy materials, in particular to a weldable cast superalloy and its application. Background technique [0002] The missile turbofan engine is the power plant of the missile, and the tail nozzle is one of the key components of the engine, and the working state of the tail nozzle directly affects the starting of the engine. The exhaust nozzle bears the heat load from high-temperature gas, as well as a large impact load, and the working environment is harsh. The tail nozzle is connected to the nozzle section by welding, and various metal components need to be welded on the tail nozzle. [0003] Therefore, for the material of the tail nozzle, it is necessary to meet the requirements of high temperature mechanical properties, casting process performance, hot corrosion resistance and welding performance. In order to improve the high-temperature performance and mechanical properties of the alloy, domesti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22F1/10F16L9/02
CPCC22C19/056C22F1/10F16L9/02
Inventor 孟凡国王帧王凯朱小平李维
Owner HEBEI GANGYAN DEKAI TECH CO LTD
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