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Method for grain size control and mechanical performance adjustment of GH4698 disc forging

A technology of grain size and forgings, which is applied in the field of grain size control and mechanical property adjustment of GH4698 disk forgings, can solve the problems of high temperature fatigue performance and difficulty in grasping the scale, and achieve the effect of performance matching

Inactive Publication Date: 2017-11-24
SHAANXI HONGYUAN AVIATION FORGING
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AI Technical Summary

Problems solved by technology

According to the technical indicators of specific forgings, high-temperature durability or high-temperature fatigue performance is required, or both high-temperature durability and high-temperature fatigue performance are required. In these cases, through forging deformation and After forging heat treatment is often difficult to grasp the corresponding scale

Method used

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  • Method for grain size control and mechanical performance adjustment of GH4698 disc forging

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Embodiment Construction

[0020] Select the production and development of a turbine disk forging of a certain type of aircraft below, and describe the process steps of the present invention in detail.

[0021] A method for grain size control and mechanical property adjustment of a GH4698 disc forging is provided, comprising the following steps:

[0022] Step 1. Carry out two fires on the sheathed bar and heat the upsetting cake to obtain a blank, ensuring that the deformation per fire is 25% to 35%;

[0023] Step 2. Carry out one-fire heating die forging on the blank to obtain the forging and air-cool it to ensure that the deformation is 25% to 35%;

[0024] Step 3. Perform the first solid solution treatment on the forging. First, heat the forging to 800°C with a heat preservation coefficient of 0.8min / mm, and then raise the temperature to the preheating temperature at a heating rate of 50-70°C / min with a heat preservation coefficient of 0.8min / mm. mm, then heated up to 1100°C, held for 8 hours, and t...

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Abstract

The invention relates to a method for controlling the crystal grain size and adjusting the mechanical properties of a GH4698 disc forging. Normally, the production of GH4698 plate forgings needs to go through several processes of upsetting, die forging, secondary solid solution and aging heat treatment, among which the billet making and die forging processes include forging heating and deformation processes. Each superalloy should formulate a heating process according to its structure change characteristics during heating. The quality of the heating process can directly affect the grain size and mechanical properties of GH4698 alloy forgings. The present invention focuses on setting different heating parameters of GH4698, explains how different heating parameters affect the grain size of the structure, and purposely adjusts the grain size of the structure, so as to meet the mechanical performance requirements required by the standard.

Description

Technical field: [0001] The invention belongs to the technical field of thermal processing of superalloys, and relates to a method for controlling the grain size and adjusting the mechanical properties of a GH4698 disc 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] The formulation of all heating procedures for GH4698 products for aero-engines should follow the structure change characteristics of GH4698 materials during heating: the original rod structure is a single-phase γ matrix + a small amou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10
CPCC22F1/10
Inventor 王国强甄小辉
Owner SHAANXI HONGYUAN AVIATION FORGING
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