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A single-stage homogeneous annealing process for high-alloyed gh4720li alloy

A technology of homogenization annealing and alloying, applied in the field of metal materials and their processing, can solve the problems of forging structure, complex annealing process, complex diffusion law, etc., and achieve the effects of low production cost, simple process operation and uniform composition

Active Publication Date: 2020-06-05
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the high-alloyed GH4720Li alloy with an ingot shape of Φ508 mm smelted by vacuum induction melting, protective atmosphere electroslag remelting and vacuum consumable remelting triple process, the low-melting point precipitates are easy to burn to form holes, and the Al , Ti, W, Mo and other elements make the diffusion law more complicated
If the homogenization annealing system is not properly selected, it will easily lead to serious structural problems in the forgings. If the segregation is not eliminated completely, it is easy to form strips in the forgings and cause the forgings to be scrapped.
At present, high-alloyed superalloys often adopt multi-stage homogenization annealing process. The annealing process is complicated, the cycle is long, and the production cost is high. Therefore, it is particularly important to formulate a reasonable homogenization annealing system for high-alloyed superalloys.

Method used

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  • A single-stage homogeneous annealing process for high-alloyed gh4720li alloy
  • A single-stage homogeneous annealing process for high-alloyed gh4720li alloy
  • A single-stage homogeneous annealing process for high-alloyed gh4720li alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This embodiment includes the following steps:

[0025] Step 1. The high-alloyed GH4720Li alloy ingot with a shape of Φ508mm smelted by vacuum induction melting, protective atmosphere electroslag remelting and vacuum consumable remelting triple process is cut from the head into a 20mm thick ingot sheet, Then cut the high-alloyed GH4720Li alloy sample of 10mm × 10mm × 10mm (length × width × height) in the core of the ingot, and then place the high-alloyed GH4720Li alloy sample in a high-temperature box furnace at 10 ° C / The heating rate of min is heated to 1120°C;

[0026] Step 2: Heat the high-alloyed GH4720Li alloy sample heated to 1120°C in step 1 to 1230°C at a heating rate of 5°C / min, keep it warm for 8 hours, and then cool in the furnace.

[0027] Figure 1a For the as-cast structure OM figure of the highly alloyed GH4720Li alloy that the present embodiment adopts, Figure 1b For the SEM figure of the highly alloyed GH4720Li alloy that this embodiment adopts, from...

Embodiment 2

[0043] This embodiment includes the following steps:

[0044] Step 1. The high-alloyed GH4720Li alloy ingot with a shape of Φ508mm smelted by vacuum induction melting, protective atmosphere electroslag remelting and vacuum consumable remelting triple process is cut from the head into a 20mm thick ingot sheet, Then cut the high-alloyed GH4720Li alloy sample of 10mm * 10mm * 10mm (length * wide * high) in the core of the ingot, and then place the high-alloyed GH4720Li alloy sample in a high-temperature box furnace at 15 ° C / The heating rate of min is heated to 1120°C;

[0045] Step 2: Heat the highly alloyed GH4720Li alloy sample heated to 1120°C in step 1 to 1180°C at a heating rate of 1°C / min for 28 hours, and then cool with the furnace.

[0046] Figure 5 Adopt the SEM figure of the highly alloyed GH4720Li alloy after single-stage homogenization annealing for this embodiment, from Figure 5 It can be seen that there are carbide residues in the high-alloyed GH4720Li alloy...

Embodiment 3

[0048] This embodiment includes the following steps:

[0049] Step 1. The high-alloyed GH4720Li alloy ingot with a shape of Φ508mm smelted by vacuum induction melting, protective atmosphere electroslag remelting and vacuum consumable remelting triple process is cut from the head into a 20mm thick ingot sheet, Then cut the high-alloyed GH4720Li alloy sample of 10mm * 10mm * 10mm (length * wide * high) at the core of the ingot, then place the high-alloyed GH4720Li alloy sample in a high-temperature box furnace at 20 ° C / The heating rate of min is heated to 1120°C;

[0050] Step 2: Heat the highly alloyed GH4720Li alloy sample heated to 1120°C in step 1 to 1200°C for 16 hours at a heating rate of 3°C / min, and then cool with the furnace.

[0051] After testing, it was found that the (γ+γ′) eutectic phase and boride low-melting point precipitates of the high-alloyed GH4720Li alloy after single-stage homogenization annealing in this example were completely re-dissolved, and there...

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Abstract

The invention discloses a single-stage homogenizing annealing technology for a high-alloying GH4720Li alloy. The technology includes the following steps that firstly, the high-alloying GH4720Li alloyis heated to 1120 DEG C with the temperature rising rate of 10 DEG C / min to 20 DEG C / min; and secondly, the high-alloying GH4720Li alloy heated to 1120 DEG C in the first step is heated to 1180 DEG Cto 1230 DEG C with the temperature rising rate of 1 DEG C / min to 5 DEG C / min, then heat insulation is conducted for 8 h to 28 h, and then furnace cooling is conducted. By means of the single-stage homogenizing annealing technology, due to the fact that the temperature rising rate, the temperature and the heat insulation time of single-stage homogenizing are controlled, (gamma+gamma') eutectic phases and boride low-melting-point precipitated phases existing in the high-alloying GH4720Li alloy are eliminated, sufficient diffusion of the elements of Al, Ti, W and Mo is promoted, element segregation is eliminated, in addition, the overburning phenomenon cannot happen in the annealing process, and the high-alloying GH4720Li alloy with the uniform components is obtained.

Description

technical field [0001] The invention belongs to the field of metal materials and their processing, and in particular relates to a single-stage homogenization annealing process for high-alloyed GH4720Li alloys. Background technique [0002] Superalloys are key hot-end materials for advanced aerospace engines, including hot-end components such as turbine disks, turbine blades, guide vanes, and combustion chambers, and their application proportions in advanced aeroengines exceed 40%. In order to meet the needs of the rapid development of the modern aviation industry, higher content of γ′ phase elements such as Al, Ti, and refractory metal elements such as W, Mo, and Nb are often added to superalloys, resulting in a higher degree of macro- and micro-segregation. And with the improvement of the degree of alloying and the expansion of the ingot shape, the solidification segregation tendency of the alloy is intensified. Severe solidification segregation will lead to the development...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/16C22C1/02
CPCC22C1/02C22F1/16
Inventor 马腾飞张于胜李宇力周宣张平祥
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH