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Heat treatment process for casting precipitation strengthened nickel-based superalloy

A nickel-based superalloy and precipitation strengthening technology, which is applied in the field of heat treatment process of casting precipitation-strengthened nickel-based superalloy, can solve the problems of hard alloy performance, coarsening and growth, etc., and achieve the effect of improving mechanical properties and improving uniformity

Pending Publication Date: 2022-01-21
CHINA HUANENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This heat treatment process is difficult to eliminate the γ / γ′ eutectic structure in the alloy, and the primary γ′ phase particles further coarsen and grow during the sub-solution treatment process, and the shape of the γ′ phase in the alloy is still irregular after aging (see Figure 9 ), so it is difficult for the alloy to exert its potential performance

Method used

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  • Heat treatment process for casting precipitation strengthened nickel-based superalloy
  • Heat treatment process for casting precipitation strengthened nickel-based superalloy
  • Heat treatment process for casting precipitation strengthened nickel-based superalloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The master alloy of the cast precipitation-strengthened nickel-based superalloy is put into a vacuum induction furnace for melting to obtain a master alloy ingot, and then the alloy test rod is drawn in the vacuum melting furnace, and the drawing speed of the test rod is 5mm / min. The microstructure of the as-cast alloy is as follows: figure 1 shown. Subsequently, the alloy is heat treated, and the specific heat treatment process is as follows:

[0042] 1) Solution treatment: send the alloy test rod into the vacuum heat treatment furnace and raise the temperature to 1210°C with the furnace at a rate of 6.7°C / min, keep it for 8h, then raise the temperature to 1228°C for 2h, keep it for 20h, and then pass through the air cooling zone to room temperature.

[0043] The low magnification image of the microstructure of the alloy after solution treatment is as follows: figure 2 shown. from figure 2 It can be seen that the γ / γ′ eutectic structure is completely eliminated...

Embodiment 2

[0049] The master alloy ingot was obtained by melting in a vacuum induction furnace, and then the alloy test bar was drawn in the vacuum melting furnace. The drawing rate of the test bar was 5mm / min. figure 1 shown.

[0050] 1) Solution treatment: Put the alloy test rod into the vacuum heat treatment furnace and raise the temperature to 1215°C with the furnace at a rate of 6.8°C / min, keep it for 6h, then raise the temperature to 1225°C for 2h, keep it for 20h, and then pass through the air cooling zone to room temperature.

[0051] The low-magnification image of the microstructure of the alloy after solution treatment is as follows Image 6 shown. from Image 6 It can be seen that the γ / γ′ eutectic structure is completely eliminated, and the dendrite segregation and component segregation are basically completely eliminated.

[0052] 2) Stabilization heat treatment: Send the sample after solid solution treatment and cold zone into a vacuum heat treatment furnace and heat i...

Embodiment 3

[0060] The master alloy ingot was obtained by melting in a vacuum induction furnace, and then the alloy test bar was drawn in the vacuum melting furnace. The drawing rate of the test bar was 4 mm / min. The microstructure of the cast alloy was as follows figure 1 shown.

[0061] 1) Solution treatment: Put the alloy test rod into the vacuum heat treatment furnace and raise the temperature to 1205°C with the furnace at a rate of 6°C / min, keep it for 7h, then raise the temperature to 1220°C for 2h, keep it for 10h, and then pass through the air cooling zone to room temperature.

[0062] 2) Stabilization heat treatment: Send the sample after solid solution treatment and cold zone into a vacuum heat treatment furnace and heat it up to 1075°C at a rate of 15°C / min, keep it for 2 hours, and then pass through the air cooling zone to room temperature.

[0063] 3) Aging treatment: Send the alloy test rod after solid solution and stabilization heat treatment into a vacuum heat treatment ...

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Abstract

A treatment process for casting precipitation strengthened nickel-based superalloy comprises the following steps that firstly, mother alloy of the casting precipitation strengthened nickel-based superalloy is put into a vacuum induction furnace to be smelted and then drawn into an alloy bar; secondly, the temperature of the alloy bar in the first step is increased to 1205-1215 DEG C from the room temperature, heat preservation is conducted for 6-8 h, then the temperature is increased to 1220-1230 DEG C, heat preservation is conducted for 10-20 h, and then the alloy bar is cooled to the room temperature through air; thirdly, the alloy bar subjected to solid solution heat treatment in the second step is subjected to stabilizing heat treatment; and fourthly, the alloy bar subjected to heat treatment in the third step is subjected to aging heat treatment. After the alloy is treated by the process, dendritic segregation and eutectic structures are eliminated, the microstructure uniformity is remarkably improved, and the mechanical property of the alloy is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of metal heat treatment, and in particular relates to a heat treatment process for casting precipitation-strengthening nickel-based superalloys. Background technique [0002] Because ordinary casting precipitation strengthened nickel-based superalloys not only have excellent high-temperature tensile strength, durable strength and fatigue strength, but also have excellent corrosion resistance, high-temperature microstructure stability and casting formability, they are usually used as advanced industrial gas turbine turbines and aerospace alloys. The main material of the key hot end parts of the engine turbine. [0003] As far as metal materials are concerned, in the initial stage of plastic deformation, the deformation morphology is uniformly distributed macroscopically; however, as the deformation progresses, the uniform deformation is gradually replaced by local uneven plastic deformation. Once local plast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10C22F1/02C22C19/05
CPCC22F1/10C22F1/02C22C19/057
Inventor 张鹏严靖博袁勇谷月峰鲁金涛杨珍
Owner CHINA HUANENG GRP CO LTD
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