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A Method for Reducing Internal Residual Stress of Large Size Disc Forgings of gh4169 Alloy

A GH4169, internal residual stress technology, applied in the field of advanced deformed superalloy disk forgings preparation technology, can solve the problem of not finding technical documents, and achieve the effect of narrow plastic processing range, reduce internal residual stress value, and avoid dimensional deformation

Active Publication Date: 2020-09-22
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] After searching, no technical literature completely identical to the content of the innovation point of the present invention has been found at present

Method used

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Experimental program
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Embodiment

[0057]According to the chemical composition target value of GH4169 alloy, the raw materials used are Ni9996; Cr: JCr99-A; Al: 99.90; Ti: MHT-100, Nb: Nb-1, Mo: Mo-1, C: TSC Carbon spectrum electrode carbon in high-purity graphite; metal raw materials are loaded into the furnace, and the vacuum induction melting furnace equipment (capacity 2 tons) equipped with an electromagnetic stirring device is used for vacuum induction melting to prepare GH4169 alloy ingots. GH4169 alloy ingot is welded with the dummy electrode of the electroslag furnace; the electroslag furnace with an argon atmosphere protection device is used for electroslag remelting; the steel ingot is machined, cut, and the surface is polished to no scale and welded with the dummy electrode ;The GH4169 ingot is prepared by vacuum self-consumption remelting; the consumable ingot is subjected to homogenization heat treatment, and the adopted process is: slowly increase the temperature from room temperature (heating rate...

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Abstract

The invention belongs to the technical field of preparing of a deformation high-temperature alloy GH4169 disk forge piece for an advanced aero-engine, and relates to a method for reducing the internalresidual stress of a GH4169 alloy large-size disk forge piece. The method includes the following steps of preparing a GH4169 alloy pure smelting cast ingot, conducting uniform heat treatment on the GH4169 cast ingot, cogging the cast ingot, preparing a biscuit, conducting compounding and coating, conducting gradient-speed-control constant-temperature die forging, conducting heat treatment on thedisk forge piece, conducting rough machining and conducting stress relief annealing. By means of the prepared low-stress GH4169 alloy disk forge piece, it is ensured that the internal stress of the deformation high-temperature alloy cast ingot is slowly released, the internal metallurgical quality of the alloy ingot is improved, and the disk forge piece can be used for preparing an advanced aero-engine high-pressure compressor disk, a high-pressure turbine disk, a low-pressure turbine disk and other parts.

Description

Technical field: [0001] The invention belongs to the field of preparation technology of advanced deformed superalloy disk forgings. The invention relates to a process method for reducing the residual stress of a GH4169 alloy disk forging, reducing processing and use deformation, and precisely controlling the size of the disk. Background technique: [0002] Preparation technology of deformed superalloy discs (turbine discs, high-pressure compressor discs) for advanced aero-engines. Residual stress refers to the elastic stress that the object itself maintains balance under the action of no external force or torque, and is an important research content of the surface integrity of metal parts. Because it has an important influence on the fatigue performance of aero-engine discs, it has received attention at home and abroad. [0003] Metal parts (including GH4169 alloy turbine disk) will generate residual stress inside no matter they are hot-worked or cold-worked. Due to vario...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/10
CPCC22F1/10
Inventor 张勇韦康王涛贾崇林李钊
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS