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Method for preparing high-purity high-temperature alloys by using returned materials

A high-temperature alloy and return material technology, which is applied in the direction of improving process efficiency, can solve the problems of severe action and inclusion, and achieve the effects of shortening refining time, promoting removal, reducing cost and energy consumption

Inactive Publication Date: 2019-08-09
BEIHANG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of vacuum induction melting can effectively reduce the removal of nitrogen and oxygen elements, but when the vacuum is too high, the interaction between the alloy and the crucible is more severe, causing the crucible to introduce inclusions into the alloy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: A method for preparing high-purity superalloys using cast superalloy return materials

[0019] The raw material used is 100% K417 alloy return material for the preparation of 417 master alloy.

[0020] The specific purification and smelting steps are:

[0021] Step (1), charging: install the yttrium oxide crucible and fully preheated ingot mold in the vacuum induction melting furnace, clean the crucible and ingot mold, and install alumina or yttrium oxide ceramic filter on the sprue cup ; Cleaning of the yttrium oxide crucible and the ingot mold: use a dust collector to clean the inner wall of the yttrium oxide crucible and the ingot mold; add the pretreated superalloy return material to the yttrium oxide crucible, and close the vacuum induction melting furnace door;

[0022] In the step (1), the pretreatment method of the superalloy returned material is to perform sand blasting or grinding on the superalloy returned material, and then use an industrial ultr...

Embodiment 2

[0028] Example 2: A method for preparing high-purity superalloys using single crystal superalloy return materials

[0029] A method for purifying and smelting 25Kg of N5 single crystal superalloy return material by using a yttrium oxide crucible.

[0030] The specific purification and smelting steps are:

[0031] Step (1), charging: install the yttrium oxide crucible and fully preheated ingot mold in the vacuum induction melting furnace, clean the crucible and ingot mold, and install alumina or yttrium oxide ceramic filter on the sprue cup ;Cleaning of the yttrium oxide crucible and the ingot mold: use a dust collector to clean the inner wall of the yttrium oxide crucible and the ingot mold; after adding the pretreated superalloy return material into the yttrium oxide crucible, close the furnace door of the vacuum induction melting furnace;

[0032] In the step (1), the pretreatment method of the superalloy returned material is to perform sand blasting or grinding on the supe...

Embodiment 3

[0038] Example 3: A method for preparing high-purity cast superalloys using returned material

[0039] A method for purifying and smelting 25Kg of K417 alloy riser return material by using yttrium oxide crucible.

[0040] The specific purification and smelting steps are:

[0041] Step (1), charging: install the yttrium oxide crucible and fully preheated ingot mold in the vacuum induction melting furnace, clean the crucible and ingot mold, and install alumina or yttrium oxide ceramic filter on the sprue cup ;Cleaning of the yttrium oxide crucible and the ingot mold: use a dust collector to clean the inner wall of the yttrium oxide crucible and the ingot mold; after adding the pretreated superalloy return material into the yttrium oxide crucible, close the furnace door of the vacuum induction melting furnace;

[0042] In the step (1), the pretreatment method of the superalloy returned material is to perform sand blasting or grinding on the superalloy returned material, and then...

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PUM

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Abstract

The invention discloses a method for preparing high-purity high-temperature alloys by using returned materials. The method is characterized by comprising the following steps in sequence: charging: pretreated high-temperature alloy returned materials are fed in a yttrium oxide crucible; and a door of a vacuum induction smelting furnace is closed; smelting: the vacuum induction smelting furnace is vacuumized to reach the furnace internal vacuum degree of 0.005-0.05 Pa; then, the smelting is started until all burdens are molten; when the burdens are heated to reach 1600-2000 DEG C, redundant argon in a hearth is extracted to maintain the hearth internal vacuum degree of 0.3-0.5 Pa; metal yttrium blocks are fed from a secondary feed port; the feeding quantity of the yttrium blocks is 0.01-0.2%of the weight of the high-temperature alloy returned materials; the refining is performed; and the molding by casting is performed after refining. The O and N contents of purified and smelted high-temperature alloys are reduced below 4 ppm; the purity reaches the level of high-quality and high-purity high-temperature alloy new materials; and the utilization rate of resources is increased.

Description

technical field [0001] The invention relates to the field of high-temperature alloy preparation, in particular to a method for preparing high-purity high-temperature alloy by using returned material. Background technique [0002] With the development of industrial technology and the extensive use of aero-engines and gas turbines, the demand for high-temperature alloys is increasing. In addition, the development of aviation industry technology also puts forward higher requirements for the quality of high-temperature alloys. Since superalloy parts are usually obtained by casting, some alloy waste will be generated at the sprue and runner during this process. In addition, casting defects generated during the casting process will cause a large number of defective products. A large amount of car chips will be produced, and the alloy waste produced by these sprue risers, waste castings, and runners accounts for more than 70% of the weight of the original smelted alloy. These wast...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C1/06C22B7/00
CPCC22B7/001C22C1/02C22C1/06Y02P10/20
Inventor 张花蕊李庆玲张虎
Owner BEIHANG UNIV
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