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Method for improving high-temperature endurance performance of large GH4698 turbine disc forged piece

A technology of GH4698 and turbine disk, which is applied in the field of thermal processing of high-temperature alloys, can solve the problems of low high-temperature durability and other problems

Inactive Publication Date: 2020-04-10
SHAANXI HONGYUAN AVIATION FORGING
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention: to provide a method for improving the high-temperature durability of large-scale GH4698 turbine disk forgings, so as to solve the problem of low high-temperature durability of large-scale GH4698 turbine disk under high-stress conditions

Method used

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Embodiment

[0042] The production and development of a certain type of gas turbine GH4698 high-pressure turbine disc forging is selected below, and the process steps of the present invention are described in detail.

[0043] A manufacturing control method for improving the high-temperature durability performance of a large GH4698 turbine disc forging, comprising the following steps:

[0044] Step 1, rod component selection: Fe(wt%)=0.12%, Al(wt%)=1.63%, Ti(wt%)=2.58%;

[0045] Step 2, forging deformation heat control: forging 2 fires are completed, the deformation is 48.4%, 46.3%, respectively, the final forging temperature is 985, 1003 ℃; For forging, the billet should be covered with aluminum silicate insulation cotton.

[0046] Step 3. Cooling speed control after forging: slow cooling in the range of 1000-850 °C, and appropriate rapid cooling below 850 °C;

[0047] Step 4. The first solid solution cooling speed control: natural air cooling from the solid solution temperature (1100-11...

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Abstract

The invention belongs to the technical field of the hot working of high-temperature alloys and relates to a method for improving the high-temperature endurance performance of a large GH4698 turbine disc forged piece. According to the method of the invention, the selection of the components of a GH4698 rod, the deformation heating number of the GH4698 rod and the post-forging-and-hot treatment cooling speed of the GH4698 rod are controlled, and therefore, the structure uniformity of the large GH4698 turbine disc forged piece and the high-temperature endurance performance of the forged piece under a high-stress condition are greatly improved, and the comprehensive performance and market competitiveness of a product are powerfully improved.

Description

technical field [0001] The invention belongs to the technical field of thermal processing of superalloys, and relates to a method for improving the high-temperature durability of a large GH4698 turbine disk forging. Background technique [0002] GH4698 is a nickel-based superalloy strengthened by aluminum, titanium, molybdenum, niobium and other elements. It is developed on the basis of GH4033 alloy by supplementary alloying. It has high durability and good comprehensive performance in the range of 500-800 °C. . The alloy is widely used in the manufacture of important load-bearing parts such as turbine disks, compressor disks, deflectors, and load-bearing rings of aero-engines. The working temperature can reach 750~800℃. [0003] Usually, the high-temperature endurance test conditions for GH4698 high-pressure turbine disc forgings are 750°C / 412MPa, 650°C / 706MPa (≥50h), etc. A lot of practice has proved that the high-stress endurance test conditions are more stringent and l...

Claims

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Application Information

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IPC IPC(8): C22C19/03C22F1/10
CPCC22C19/03C22F1/002C22F1/10
Inventor 王国强段辉叶宁
Owner SHAANXI HONGYUAN AVIATION FORGING
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