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gh4720li alloy and its smelting method, gh4720li alloy parts and aero-engine

A technology of aero-engine and smelting method, which is applied to engine components, machines/engines, liquid fuel engines, etc., can solve the lack of operating guidelines and evaluation standards, unfavorable control of GH4720Li alloy purity and metallurgical quality stability, and limiting GH4720Li alloy purity. and other problems, to achieve the effect of high fatigue life, increased stirring effect, and reduced impurity content

Active Publication Date: 2021-07-13
BEIJING CISRI GAONA TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, when smelting GH4720Li alloy, the refining period of vacuum induction smelting lacks scientific and reasonable operating guidelines and evaluation standards, and only depends on the fluidity of the alloy liquid surface in the crucible or the refining time of the operator as the basis for the completion of refining, which will not be conducive to GH4720Li The stable control of alloy purity and metallurgical quality limits the further improvement of GH4720Li alloy purity

Method used

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  • gh4720li alloy and its smelting method, gh4720li alloy parts and aero-engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The smelting method of GH4720Li alloy comprises the following steps:

[0066] 1. Ingredients: According to the GH4720Li alloy composition control requirements, the amount of raw materials for each element is calculated according to the mass percentage;

[0067] 2. Material preparation: select nickel plate, cobalt plate, metal chromium, molybdenum bar, tungsten bar, ferroboron, graphite electrode, aluminum, titanium and zirconium, all raw materials need to be clean and free of oil;

[0068] 3. Loading: nickel plates and cobalt plates are randomly loaded into the bottom of the furnace, tungsten strips and molybdenum strips are placed in the middle of the crucible of the vacuum induction furnace, and the intermediate alloy is placed on it;

[0069] 4. High vacuum: the vacuum induction furnace is vacuumed to 30Pa;

[0070] 5. Melting period: the complete melting temperature of the alloy material is 1530°C;

[0071] 6. Refining period: After the alloy material is fully mel...

Embodiment 2

[0076] The smelting method of the GH4720Li alloy is the same as in Example 1, except that in step 6, if the absolute value of the change rate of the gas leakage rate measured twice adjacently is 4.5%-5%, the refining is stopped.

Embodiment 3

[0078] The smelting method of the GH4720Li alloy is the same as in Example 1, except that in step 6, if the absolute value of the change rate of the air leakage rate measured twice adjacently is 1.5%-2%, the refining is stopped.

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Abstract

The invention provides a GH4720Li alloy and its smelting method, GH4720Li alloy parts and aero-engine, and relates to the field of smelting technology. The GH4720Li alloy smelting method comprises: vacuum induction smelting the raw material of the GH4720Li alloy; wherein, in the vacuum induction During the refining period of smelting, 100-150KW power frequency stirring power is used for stirring. During the refining process, the air leakage rate of the vacuum induction smelting system is measured. If the absolute value of the change rate of the air leakage rate measured twice adjacently is less than or equal to 7 %, the refining is stopped. The smelting method can effectively reduce the content of harmful gas elements in the alloy liquid during smelting, reduce the quantity distribution of inclusions, and make the obtained GH4720Li alloy have high purity and high metallurgical quality.

Description

technical field [0001] The invention relates to the technical field of smelting, in particular to a GH4720Li alloy and a smelting method thereof, GH4720Li alloy components and an aero-engine. Background technique [0002] At present, when smelting GH4720Li alloy, the refining period of vacuum induction smelting lacks scientific and reasonable operating guidelines and evaluation standards, and only depends on the fluidity of the alloy liquid surface in the crucible or the refining time of the operator as the basis for the completion of refining, which will not be conducive to GH4720Li The stable control of alloy purity and metallurgical quality limits the further improvement of the purity of GH4720Li alloy. Therefore, upgrading the smelting process in the refining period is very important to further improve the purity and mechanical properties of GH4720Li alloy. [0003] In view of this, the present invention is proposed. Contents of the invention [0004] The object of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C1/03C22C19/05F01D5/02F04D29/26F01D5/28
CPCC22C1/023C22C1/03C22C19/056F01D5/02F01D5/282F04D29/26F05D2300/17
Inventor 曲敬龙谷雨杨树峰杜金辉安腾陈正阳毕中南秦鹤勇唐超王民庆史玉亭孟令胜荣义
Owner BEIJING CISRI GAONA TECH
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