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Vacuum self-consumption smelting process for master alloy ingot for powder metallurgy

A master alloy ingot casting and vacuum self-consumption technology, which is applied in the field of superalloy smelting, can solve the problems of multiple shrinkage cavities and inclusions, poor composition uniformity of ingots, and large number of inclusions, etc., to achieve low content of impurity elements and uniform composition Good performance and the effect of reducing the content of impurity elements

Active Publication Date: 2019-12-13
西安聚能高温合金材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The master alloy ingot produced by this process, due to the fast solidification speed, inevitably forms more shrinkage cavities and inclusions in the ingot, and there are long-term problems of poor composition uniformity and large number of inclusions in the ingot

Method used

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  • Vacuum self-consumption smelting process for master alloy ingot for powder metallurgy
  • Vacuum self-consumption smelting process for master alloy ingot for powder metallurgy
  • Vacuum self-consumption smelting process for master alloy ingot for powder metallurgy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] FGH4097 vacuum consumable melting, electrode specification Φ65mm, crucible specification Φ90mm,

[0030] Step 1, arc start phase

[0031] Step 1: Start the arc with a current of 0.6kA and a voltage of 22.3V, and hold for 2 minutes;

[0032] Step 2: After the electrode is preheated, gradually increase the current to 2.2kA, voltage 23.2V, time 3min;

[0033] Step 2, Steady State Phase

[0034] Keep the current at 2.2kA, voltage at 23.2V, and slowly melt the ingot; the melting rate under this process parameter is 1.3kg / min;

[0035] Step 3, heat capping stage:

[0036] The first step: quickly reduce the current and voltage within 3 minutes, the current is 1.2kA, and the voltage is 22.6V;

[0037] Step 2: Use the current 0.6kA, voltage 18.8V process, keep warm for 6 minutes, cut off the power after reaching the reserved weight, end the smelting, cool for 30 minutes and then come out of the furnace.

[0038] The initial weight of heat sealing is 6kg, and the final weigh...

Embodiment 2

[0042] FGH4096 vacuum consumable melting, electrode specification Φ68mm, crucible specification Φ90mm,

[0043] Step 1, arc start phase

[0044] Step 1: Start the arc with a current of 0.4kA and a voltage of 22.4V, and hold for 5 minutes;

[0045] Step 2: After the electrode is preheated, gradually increase the current to 1.8kA, voltage 23.6V, time 3min;

[0046] Step 2, Steady State Phase

[0047] Keep the current 1.8kA, voltage 23.6V, slowly melt the ingot; the melting speed is 1.0kg / min under the process parameters;

[0048] Step 3, heat capping stage

[0049] The first step: quickly reduce the current and voltage within 2min (1min), specifically: current 0.9kA, voltage 22.2V;

[0050] Step 2: Use the process of current 0.5kA, voltage 20.0V, keep warm for 5 minutes, cut off the power after reaching the reserved weight, end the smelting, cool for 30 minutes and then come out of the furnace.

[0051] The initial weight of heat sealing is 6.5kg, and the final weight is 1....

Embodiment 3

[0055] GH4720Li vacuum consumable melting, electrode specification Φ70mm, crucible specification Φ90mm,

[0056] Step 1, arc start phase

[0057] Step 1: Start the arc with a current of 0.8kA and a voltage of 22.8V, and hold for 1 minute;

[0058] Step 2: After the electrode is preheated, gradually increase the current to 2.8kA, 24.0V, and 3min;

[0059] Step 2, the steady state phase,

[0060] Keep the current at 2.8kA, voltage at 24.0V, and slowly melt the ingot; the melting rate under this process parameter is 1.5kg / min;

[0061] Step 3, heat capping stage

[0062]The first step: quickly reduce the current and voltage within 4 minutes, the current is 0.6kA, and the voltage is 22.8V;

[0063] Step 2: Use the process of current 0.5kA, voltage 22.2V, keep warm for 8 minutes, cut off the power after reaching the reserved weight, end the smelting, cool for 30 minutes and then come out of the furnace.

[0064] The initial weight of heat sealing is 8kg, and the final weight i...

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Abstract

The invention discloses a vacuum self-consumption smelting process for master alloy ingot for powder metallurgy. The method comprises the following steps of 1, starting a current preheating electrodeafter arc starting, then slowly increasing the current to gradually form a molten pool, that is, after preheating for 1-5 min of less than 0.8 kA current and 22.0-22.8 V voltage, gradually increasingthe current to 1.8-2.8 kA, increasing the voltage to 23.2g-24.0 V, keeping the temperature for 2-3 min, and gradually forming a stable molten pool; 2, after the molten pool is formed in step 1, slowlysmelting the electrode with a process that maintains a current of 1.8 to 2.8 kA and a voltage of 23.2 to 24.0 V; and 3, reducing the current to 0.6-1.2 kA in 1-4 min, reducing the voltage to 22.2-22.8 V, the fusion speed is rapidly reduced, then keeping the current for 5-8 min under the condition that the current is 0.4-0.6 kA, and the voltage is 18.8-22.2V, so that the depth of the molten pool is slowly reduced. According to the process, the problem of hole shrinkage in the vacuum induction casting ingot can be improved, the component uniformity of the cast ingot is improved, the content ofimpurity elements is reduced, and the higher-quality master alloy ingot is obtained.

Description

technical field [0001] The invention belongs to the technical field of high-temperature alloy smelting, and in particular relates to a vacuum self-consumption smelting process of master alloy ingots for powder metallurgy. Background technique [0002] Powdered superalloys are widely used in high-temperature and high-pressure turbine disks of aero-engines. This type of material has a more uniform grain structure and can work stably at higher temperatures for a long time. Due to its high degree of totalization, it is difficult to form by traditional upsetting and drawing deformation. Therefore, powder discs are generally prepared by master alloy ingot casting and sintering. In the field of powder metallurgy, the master alloy is used as a semi-finished product, and its inclusion content and composition uniformity have a great influence on the properties of the finished bar. [0003] At present, the production process of master alloy ingots for powder metallurgy in China is gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/20
CPCC22B9/20Y02P10/25
Inventor 史新波付宝全曹国鑫阚志张建伟李南
Owner 西安聚能高温合金材料科技有限公司
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