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Powder metallurgical method for IN718 alloy

A technology of IN718 and powder metallurgy, which is applied in the field of alloy spherical powder preparation, can solve the problems of decreased mechanical properties of alloys, ineffective effects, increased processing costs, etc., and achieves the effect of improving mechanical properties of alloys and simple process

Inactive Publication Date: 2016-05-25
SINO EURO MATERIALS TECH OF XIAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the IN718 alloy is rich in highly active elements such as Ti, Al, and Zr, a stable network of carbon and oxide layers will be formed on the surface of the powder particles, which hinders the element diffusion and metallurgical bonding between the powder particles, making the alloy mechanical properties remarkable. decline
For this reason, scholars at home and abroad have adopted methods such as powder preheating treatment, high-temperature solution treatment, and hot extrusion deformation to eliminate this powder metallurgy defect, which has a certain effect on reducing the aggregation of carbon and oxides on the powder surface, but the effect is not good. Not obvious, and increases the processing cost

Method used

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  • Powder metallurgical method for IN718 alloy
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  • Powder metallurgical method for IN718 alloy

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Experimental program
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Effect test

Embodiment 1

[0020] A powder metallurgy method for IN718 alloy, comprising the following steps:

[0021] Step 1, using the plasma rotating electrode method (PREP method) to prepare spherical powder of IN718 alloy, the particle size of the spherical powder of IN718 alloy ranges from 0 to 45 μm, the content of O in the spherical powder of IN718 alloy is 0.003%, and the content of C is 0.025%. The preparation, storage and transportation of spherical powder are all carried out under vacuum;

[0022] Step 2, put the spherical powder of IN718 alloy into the stainless steel sheath, at a temperature of 800°C and a vacuum of 5×10 -2 Vacuum degassing at Pa for 8 hours, sealing and welding the mouth of the bag;

[0023] Step 3, carry out hot isostatic pressing treatment on the sheath after sealing and welding. The treatment process is: first heat preservation and pressure at 1270°C and 120MPa pressure for 4 hours, then lower the temperature to 1160°C under the condition of constant pressure, and con...

Embodiment 2

[0026] A powder metallurgy method for IN718 alloy, comprising the following steps:

[0027] Step 1, using the plasma rotating electrode method (PREP method) to prepare spherical powder of IN718 alloy, the particle size of the spherical powder ranges from 45 to 105 μm, the O content in the spherical powder is 0.002%, and the C content is 0.02%. The preparation, storage and transportation of the spherical powder The process is carried out under the protection of inert gas;

[0028] Step 2, put the spherical powder of IN718 alloy into the stainless steel sheath, at a temperature of 600°C and a vacuum of 5×10 -2 Vacuum degassing at Pa for 6 hours, sealing and welding the mouth of the sheath;

[0029] Step 3: Carry out hot isostatic pressing treatment on the envelope after sealing and welding. The treatment process is as follows: first heat preservation and pressure at 1240°C and 130MPa pressure for 3 hours, then lower the temperature to 1130°C under the condition of constant pres...

Embodiment 3

[0032] A powder metallurgy method for IN718 alloy, comprising the following steps:

[0033] Step 1, using the plasma rotating electrode method (PREP method) to prepare spherical powder of IN718 alloy, the particle size of the spherical powder ranges from 105 to 150 μm, the O content in the spherical powder is 0.001%, and the C content is 0.015%. The preparation, storage and transportation of the spherical powder The process should be carried out under the protection of inert gas;

[0034] Step 2, put the spherical powder of IN718 alloy into the stainless steel sheath, at a temperature of 400°C and a vacuum of 5×10 -2 Vacuum degassing at Pa for 4 hours, sealing and welding the mouth of the bag;

[0035] Step 3: Carry out hot isostatic pressing treatment on the envelope after sealing and welding. The treatment process is as follows: first heat preservation and pressure at 1210°C and 120MPa pressure for 2 hours, then lower the temperature to 1100°C under the condition of constan...

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Abstract

The invention provides a powder metallurgical method for IN718 alloy. The powder metallurgical method for the IN718 alloy comprises the following steps: firstly, preparing spherical powder of the IN718 alloy by adopting a plasma rotating electrode process; secondly, putting the spherical powder into a stainless sheath, carrying out vacuum degassing for 4-8 hours at the temperature of 400-800 DEG C, and soldering and sealing the opening of the sheath; and thirdly, carrying out hot isostatic pressure treatment on the sheath after being soldered and sealed, namely firstly carrying out heat and pressure preservation for 2-4 hours at the temperature of 1210-1270 DEG C and the pressure more than 120 MPa, lowering the temperature to be 1100-1160 DEG C while the pressure condition is not changed, continuously carrying out heat and pressure preservation for 2-4 hours, and finally cooling to room temperature at a cooling rate more than 50 DEG per minute. The powder metallurgical method for the IN718 alloy is simple in technology, only hot isostatic pressure temperature is changed, an extra working process does not need to be added, adverse effect of carbon and oxides on particle surfaces can be effectively eliminated without increasing cost, and mechanical properties of the alloy are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of alloy spherical powder preparation, and in particular relates to a powder metallurgy method of IN718 alloy. Background technique [0002] INCONEL718 alloy (referred to as IN718 alloy) is an austenite-based nickel-based superalloy strengthened by means of solid solution strengthening and grain boundary strengthening. corrosion performance. IN718 alloy occupies an absolute dominant position in the entire high-temperature alloy industry due to its excellent performance and wide range of uses, and is widely used in various fields such as aviation, aerospace, petroleum, chemical industry and energy. Due to the large content and types of strengthening elements in the IN718 alloy and the high degree of alloying, the traditional deformation and casting process has serious ingot segregation, poor hot workability and difficult forming. The powder metallurgy process can effectively control the alloy chemical compo...

Claims

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Application Information

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IPC IPC(8): C22C19/03C22C1/04B22F3/15
CPCC22C19/03B22F3/15C22C1/0433
Inventor 韩志宇闫飞相敏左振博赵霄昊莫茗焜王琦王庆相梁书锦张平祥
Owner SINO EURO MATERIALS TECH OF XIAN CO LTD
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