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Preparation method and application of a kind of superalloy internal grain refiner

A technology of grain refiner and superalloy, which is applied in the fields of precision casting and material preparation, and achieves the effects of high economic efficiency, simple process and easy operation.

Active Publication Date: 2021-09-24
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

[0004] The purpose of the present invention is to provide a preparation method and application of a superalloy internal grain refiner, which is suitable for the casting process of nickel-based superalloys and solves the problem of uniform refinement of superalloy internal grains

Method used

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  • Preparation method and application of a kind of superalloy internal grain refiner
  • Preparation method and application of a kind of superalloy internal grain refiner
  • Preparation method and application of a kind of superalloy internal grain refiner

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Embodiment 1

[0028] In this embodiment, W, Co, Cr and graphite are melted in a vacuum furnace using vacuum induction technology, refined at a temperature of 1550° C. for 3 minutes, and smelted into a W-Co-Cr-C alloy ingot. In parts by weight, the W-Co-Cr-C alloy ingot contains: 60 parts of Co, 20 parts of W, 18 parts of Cr and 2 parts of C. Hammer the alloy ingot into powder to make a refiner with an average particle size of 0.95mm. Then wrap it with nickel foil and add it before pouring. The addition ratio accounts for 1% of the total weight of the smelted alloy. The grade of the smelted alloy is: K418B. Stir the alloy liquid for 90 seconds after the refiner is added, and then pour it after standing still for 40 seconds. Finally, the grain size detection is carried out.

[0029] Such as figure 2 , image 3 As shown, comparing the grain morphology of the alloy without adding the refining agent and adding the refining agent, it can be seen that the grain size displayed after adding the...

Embodiment 2

[0031] In this embodiment, W, Co, Cr and graphite are melted in a vacuum furnace using vacuum induction technology, refined at a temperature of 1650°C for 5 minutes, and smelted into a W-Co-Cr-C alloy ingot. In parts by weight, the W-Co-Cr-C alloy ingot contains: 70 parts of Co, 15 parts of W, 14 parts of Cr and 1 part of C. The alloy ingot is hammered into powder to make a refiner with an average particle size of 1.25 mm. Then wrap it with nickel foil and add it before pouring. The addition ratio accounts for 5% of the total weight of the smelted alloy. The grade of the smelted alloy is: K465. Stir the alloy liquid for 3 minutes after the refiner is added, and then pour it after stirring for 60 seconds. Finally, the grain size detection is carried out.

[0032] Such as figure 2 , Figure 4 As shown, comparing the morphology of alloy grains without adding refiner and adding refiner, it can be seen that the grains displayed after adding refiner are fine and uniform.

Embodiment 3

[0034] In this embodiment, W, Co, Cr and graphite are melted in a vacuum furnace using vacuum induction technology, refined at a temperature of 1590° C. for 3 minutes, and smelted into a W-Co-Cr-C alloy ingot. In parts by weight, the W-Co-Cr-C alloy ingot contains: 50 parts of Co, 28 parts of W, 20 parts of Cr and 2 parts of C. The alloy ingot is hammered into powder to make a refiner with an average particle size of 1.16 mm. Then wrap it with nickel foil and add it before pouring. The addition ratio accounts for 7% of the total weight of the smelted alloy. The grade of the smelted alloy is: K417G. Stir the alloy liquid for 5 minutes after the refiner is added, and then pour it after stirring for 50 seconds. Finally, the grain size detection is carried out.

[0035] Such as figure 2 , Figure 5 As shown, comparing the morphology of alloy grains without adding refiner and adding refiner, it can be seen that the grains displayed after adding refiner are fine and uniform.

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Abstract

The invention relates to the fields of precision casting and material preparation, in particular to a preparation method and application of a superalloy internal grain refiner. The W‑Co‑Cr‑C alloy ingot was prepared by vacuum induction technology, the alloy ingot was broken into small pieces, weighed according to the proportion, and wrapped with nickel foil. Adding it into a certain alloy liquid under certain casting process parameters, and finally obtaining a fine-grained structure. The constituent elements of the refiner of the present invention are the bulk elements of the high-temperature alloy, and foreign impurity elements will not be introduced into the alloy. At the same time, the high melting point W element makes the refiner less likely to decay. The refining agent of the invention has simple preparation process, convenient operation and low cost, and solves the problem of grain refinement of superalloy.

Description

technical field [0001] The invention relates to the fields of precision casting and material preparation, in particular to a preparation method and application of a superalloy internal grain refiner. Background technique [0002] Ordinary polycrystalline cast superalloys are still widely used in modern aerospace engines and industrial gas turbines, especially cast superalloys working under medium and low temperature conditions are basically polycrystalline. Polycrystalline superalloy castings produced under ordinary investment casting conditions are relatively coarse dendrites or columnar crystals, which are the key factors leading to fatigue loss of castings. For this purpose, the grains inside the superalloy are refined. [0003] At present, there is still a lack of comprehensive evaluation of the mechanical properties of superalloy fine grains, and a more prominent common problem is that it is difficult to achieve uniform refinement of internal grains. Contents of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C19/07C22C30/00C22C1/03C22C19/05
CPCC22C1/02C22C1/023C22C1/03C22C19/05C22C19/07C22C30/00
Inventor 杨金侠周亦胄孙元荀淑玲孙晓峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI