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A kind of homogenization heat treatment method of low-cost nickel-iron-based superalloy ingot

A technology for homogenizing heat treatment and nickel-based superalloys, which is applied in the field of alloy materials to achieve the effects of eliminating brittle phases, improving thermoforming properties and plasticity, and improving homogenization efficiency.

Active Publication Date: 2022-08-02
HUANENG POWER INT INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned technical problems, the object of the present invention is to provide a method for homogenizing heat treatment of low-cost nickel-iron-based superalloy ingots, which can effectively eliminate element segregation in the ingot, and solve the problem of ingot segregation due to the existence of eutectic structure. And open the billet to produce cracking source, improve the thermal deformation capacity of the alloy, and benefit the subsequent thermal processing of the bar blank

Method used

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  • A kind of homogenization heat treatment method of low-cost nickel-iron-based superalloy ingot
  • A kind of homogenization heat treatment method of low-cost nickel-iron-based superalloy ingot
  • A kind of homogenization heat treatment method of low-cost nickel-iron-based superalloy ingot

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Example 1: The experimental material is an alloy ingot. By mass percentage, Fe: 20%-30%, Cr: 19%-25%, Al: 0.5%-2.5%, Ti: 1.0%-2.5%, Nb: ≤ 2%, Mo: ≤ 2%, W: ≤2%, Ta:≤1%, Si:≤0.5%, Mn:≤1.0%, Cu:≤0.5%, C:≤0.05%, B:≤0.01%, Zr:≤0.03%, the rest are Ni; Add it to the vacuum induction furnace for melting, and pour it into an alloy ingot of Φ508mm. The casting process is obtained by vacuum induction melting and vacuum consumable melting process.

[0026] like figure 1 As shown in (a) and 1(b), the as-cast micrographs of the as-cast structure of the nickel alloy of the present embodiment before the homogenization treatment, figure 1 (a) shows that there are obvious dendrites in the ingot structure, and there are obvious carbides between the dendrites. figure 1 (b) shows that there are obvious carbides between dendrites in the ingot structure.

Embodiment 2

[0027] Example 2: The method provided by the present invention is used for the ingot of Example 1 to carry out multi-stage homogenization treatment of different processes on the nickel alloy billet. The heating time from room temperature to the first stage homogenization temperature is 8h, and the nickel alloy The billet was kept at 860°C for 5h in the heat treatment furnace to complete the first-stage homogenization treatment; the heating time from the first-stage homogenization temperature to the second-stage homogenization temperature was 8h, the heat treatment temperature was 1150°C, and the first-stage homogenization was completed after 5h of heat preservation. Two-stage homogenization treatment; the heating time from the second-stage homogenization temperature to the third-stage homogenization temperature is 3h, the heat treatment temperature is 1190 ° C, and the third-stage homogenization treatment is completed after holding for 50h; after the homogenization is completed,...

Embodiment 3

[0030]Example 3: The method provided by the present invention is used for the ingot of Example 1 to carry out three-stage homogenization treatment of different processes on the nickel alloy billet, and the heating time from room temperature to the first-stage homogenization temperature is 8h, and the nickel alloy The billet was kept at 860°C for 5h in the heat treatment furnace to complete the first-stage homogenization treatment; the heating time from the first-stage homogenization temperature to the second-stage homogenization temperature was 8h, the heat treatment temperature was 1150°C, and the first-stage homogenization was completed after 5h of heat preservation. Two-stage homogenization treatment; the heating time from the second-stage homogenization temperature to the third-stage homogenization temperature is 3h, the heat treatment temperature is 1200 ° C, and the third-stage homogenization treatment is completed after holding for 30h; after the homogenization is complet...

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Abstract

The present invention is a method for homogenizing heat treatment of low-cost nickel-iron-based superalloy ingots. The basic composition of the alloy includes: Fe, Cr, Al, Ti, Nb, Mo, W, Ta, Si, Mn, Cu, C, B, Zr, and the rest are Ni. The processing steps are as follows: heating from room temperature to 850 ℃ ~ 900 ℃, and the heating time is controlled to be greater than or equal to 8h; heat preservation at 850 ℃ ~ 900 ℃ for the first level of homogenization heat treatment, the holding time is based on the actual heat treatment thickness of the material parts, according to the thickness For each increase of 1mm, the holding time is increased by 0.6min; heated to 1150 ℃ for the second level of homogenization heat treatment, the heating time is controlled to be greater than or equal to 8h, and the holding time is the same as the holding time of the same level; finally, the heat is heated to 1180 ~ 1200 ℃ for 30 ~ 80h of homogenization treatment, The heating time is controlled to be greater than or equal to 8h; the ingot after heat treatment is cooled to below 650 ℃ with the furnace, and then cooled to room temperature. The process treatment can effectively eliminate the segregation in the ingot, effectively reduce the time of homogenization heat treatment, and reduce the energy consumption and production cost.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, and in particular relates to a method for homogenizing heat treatment of low-cost nickel-iron-based superalloy ingots. Background technique [0002] Due to my country's unique resource structure, the proportion of coal power generation still remains high. The statistics of the Bureau of Statistics in 2019 show that coal power generation accounts for about 69%. It is expected that coal power will still occupy a dominant position in the power supply for a long time in the future. . In the face of increasingly stringent energy conservation and emission reduction requirements and actual power demand, in terms of technological maturity and economic comparison, the use of ultra-supercritical generator sets with flue gas purification devices is the best way to meet the needs of the power industry for large-capacity green coal power equipment. choose. At this stage, the total number of ultra-sup...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22C30/00C22C30/02C22F1/10
CPCC22C19/058C22C19/056C22C19/055C22C30/00C22C30/02C22F1/10
Inventor 李沛杨征谷月峰袁勇鲁金涛严靖博尹宏飞党莹樱杨珍黄锦阳
Owner HUANENG POWER INT INC
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