Two-stage homogenization heat treatment method for high-strength nickel-based superalloy cast ingot

A nickel-based superalloy, homogenized heat treatment technology, applied in the field of alloy materials, to achieve the effect of eliminating dendrites, eliminating element segregation, and reducing carbide content

Pending Publication Date: 2022-01-28
CHINA HUANENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned technical problems, the object of the present invention is to provide a two-stage homogenization heat treatment method for high-strength nickel-based superalloy ingots, which can effectively eliminate the eutectic structure in the alloy structure, eliminate element segregation in the ingot, Solve the source of cracking in ingots and blanks due to the existence of eutectic structures, improve the thermal deformation capacity of alloys, and facilitate the subsequent thermal processing of bar blanks

Method used

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  • Two-stage homogenization heat treatment method for high-strength nickel-based superalloy cast ingot
  • Two-stage homogenization heat treatment method for high-strength nickel-based superalloy cast ingot
  • Two-stage homogenization heat treatment method for high-strength nickel-based superalloy cast ingot

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Experimental program
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Effect test

Embodiment 1

[0026] Example 1: The experimental material was processed into a ingot having a diameter of 300 mm for secondary homogenization treatment. CR: 15% ~ 18%, CO: 15% ~ 20%, Ti: 0.5% ~ 1.4%, and W: 5% ~ 8.5%, Si: ≤ 0.5%, Si: ≤ 0.5%, Si: ≤ 0.5%, Si: Mn: ≤0.5%, Nb: 0.5% ~ 1.5%, C: 0.03% ~ 0.08%, the margin is Ni, and the vacuum induction furnace is added, and it is cast into a alloy ingot. The casting process is vacuum induction smelting + electric slag remember + vacuum self-consuming smelting triple process smelting.

[0027] like figure 1 (a) and 1 (b) show that the cast tissue scanning electron micrograph before the nickel alloy homogenization process of the present embodiment, figure 1 (a) shows that there is a significant dendrite crystal in the ingot tissue, and there is a significant carbide in the branches. figure 1 (b) shows that there is a significant eutectic structure in the dendrites between the ingot tissue and the dendrites.

Embodiment 2

[0028] Example 2: Two-stage homogenization treatment of different processes for different processes of the nickel alloy blank using the method of the present invention, from the room temperature rise to the first stage homogenization temperature of 5 ° C / min The nickel alloy fell in the heat treatment furnace at 1080 ° C for 48 h, complete the first stage homogenization treatment; the first stage homogenized fillar is heated to the second stage homogenization temperature, the heat treatment temperature is 1200 ° C, after insulation 96h, complete the second level homogenization treatment, and the homogenization is completed, and the tissue shape after the two-stage uniform treatment is treated. figure 2 . according to figure 1 and figure 2 After the homogenization of the display, it can be apparent that after the homogenization process produced by the present invention, even if the homogenization process of the blank is also thoroughly thorough, the grain size is about 500 μm, th...

Embodiment 3

[0031] Example 3: Two-stage homogenization treatment of different processes in different processes by the alloy provided in the present invention, from room temperature rises to the first stage homogenization temperature of 10 ° C / min, The nickel alloy is 1080 ° C for 12 hours in the heat treatment furnace, and the first stage homogenization treatment is completed; the first stage homogeneous embryo is raised to the second stage homogenization temperature, the heat treatment temperature is 1220. EtOAc image 3 . Combine image 3 It can be seen that when the second stage homogenization temperature is 1220 ° C, the alloy is uniform, and the carbide distributed on the grain boundary is dissolved, the mesh structure disappears, and there is only a small amount of carbide left in the substrate. Although this processing system has also achieved homogenization requirements, since the homogenization temperature of the second stage is short, the total temperature is high, but the homogeneo...

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Abstract

The invention discloses a two-stage homogenization heat treatment method for a high-strength nickel-based superalloy cast ingot, and belongs to the technical field of metal materials. The alloy comprises the following basic components: 15%-18% of Cr, 15%-20% of Co, 0.5%-1.5% of Ti, 3.5%-4.5% of Al, 5%-8.5% of W, less than or equal to 0.5% of Si, less than or equal to 0.5% of Mn, 0.5%-1.5% of Nb, 0.03%-0.08% of C and the balance of Ni. The method comprises the following treatment steps of: loading a nickel alloy ingot into a heat treatment furnace at the temperature of less than or equal to 600 DEG C; heating to 1180-1100 DEG C, controlling the heating speed to be 5-10 DEG C / min, and carrying out first-stage heat treatment; carrying out heat preservation for 12-48 hours at 1180-1100 DEG C, carrying out second-stage heat treatment, controlling the heating speed to be 5 DEG C / min, and carrying out heat preservation for 48-120 hours at 1200-1240 DEG C; and cooling the ingot subjected to heat treatment to below 700 DEG C along with the furnace, and then air-cooling to room temperature, or directly air-cooling. According to the high-strength nickel alloy cast ingot treated through the technology, the eutectic structure in the cast ingot can be effectively eliminated, meanwhile, composition segregation is eliminated, the obtained structure is uniform, the homogenizing heat treatment time is effectively shortened, and energy consumption and production cost are reduced.

Description

Technical field [0001] The present invention belongs to the field of alloy material, and more particularly to a two-stage uniform heat treatment method for high-strength nickel-based high-temperature alloy ingots. Background technique [0002] With the vigorous advancement of my country's energy conservation and emission reduction, it is more urgent to improve the demand for energy efficiency in my country. Due to my country's rich coal resources, fire power generation will have long-term as my country's most important power generation technology, and the steam parameters of China are the most effective means of improving the power generation efficiency of the fire generator, and the choice of key component materials in the boiler is the key bottleneck of this technology. . As one of the most stringent key components of the fire generator boiler, it has put forward very high requirements for the service performance of the material. Excess / reheaurs will withstand multiple factor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C22C30/00C22F1/10C22F1/16
CPCC22C19/056C22C30/00C22F1/10C22F1/16
Inventor 李沛严靖博鲁金涛袁勇谷月峰
Owner CHINA HUANENG GRP CO LTD
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