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Connecting method of powder high-temperature alloy double-spoke-plate hollow turbine disc

A high-temperature alloy and connection method technology, applied in welding equipment, metal processing equipment, furnace types, etc., can solve problems such as high-temperature creep of joints, affecting structural integrity and performance, high-temperature fatigue, etc.

Active Publication Date: 2020-12-01
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The electron beam welding process of the inner cavity or the welding seam reinforcement and the flash of the inertial friction welding joint cannot be removed, which affects the structural integrity and performance;
[0005] (2) The casting structure of the electron beam welded joint is difficult to meet the requirements of the turbine disk for high temperature creep performance and fatigue crack growth resistance;
[0006] (3) The temperature of superalloy diffusion bonding is generally 80% to 85% of the melting point of the alloy. For this new type of powder superalloy, it is about 1000°C to 1100°C. The original diffusion connection interface still exists, which destroys the integrity of the microstructure of the joint, and the properties of the joint such as high temperature creep and high temperature fatigue cannot meet the use requirements; further increasing the welding temperature will lead to a decrease in the performance of the base metal, and the comprehensive performance of the parts cannot meet the use requirements
[0007] In summary, the existing technological level has limited the development and application of new high-performance engine powder alloy hollow turbine disks

Method used

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  • Connecting method of powder high-temperature alloy double-spoke-plate hollow turbine disc
  • Connecting method of powder high-temperature alloy double-spoke-plate hollow turbine disc
  • Connecting method of powder high-temperature alloy double-spoke-plate hollow turbine disc

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1: Precision machining before welding

[0038] The workpiece to be welded is processed before welding by grinding and turning combined processing, and the workpiece to be welded is two nearly symmetrical blank half disks, see figure 2 . The circular planes and welding surfaces of the two parts to be welded are processed to a flatness of ≤0.05mm, and the parallelism between any circular plane and welding surface is ≤0.05mm.

[0039] Step 2: Assemble and locate

[0040] Align and fit the two pieces to be welded, and after fine-tuning the alignment, fix the relative position of the two pieces to be welded, use positioning pins for positioning, and adjust the relative position of the two pieces to be welded to make the relative runout of the circumference of the assembled pieces to be welded≤ 0.15mm, the assembly clearance of the welding surface in the free state is ≤0.1mm, and the parallelism between the upper and lower annular planes is ≤0.1mm, assembled.

[0041...

Embodiment 2

[0056] Step 1: Precision machining before welding

[0057] The workpiece to be welded is processed before welding by grinding and turning combined processing, and the workpiece to be welded is two nearly symmetrical blank half disks, see figure 2 . The circular planes and welding surfaces of the two parts to be welded are processed to a flatness of ≤0.05mm, and the parallelism between any circular plane and welding surface is ≤0.05mm.

[0058] Step 2: Assemble and locate

[0059] Align and fit the two pieces to be welded, and after fine-tuning the alignment, fix the relative position of the two pieces to be welded, use positioning pins for positioning, and adjust the relative position of the two pieces to be welded to make the relative runout of the circumference of the assembled pieces to be welded≤ 0.15mm, the assembly clearance of the welding surface in the free state is ≤0.1mm, and the parallelism between the upper and lower annular planes is ≤0.1mm, assembled.

[0060...

Embodiment 3

[0075] Step 1: Precision machining before welding

[0076] The workpiece to be welded is processed before welding by grinding and turning combined processing, and the workpiece to be welded is two nearly symmetrical blank half disks, see figure 2 . The circular planes and welding surfaces of the two parts to be welded are processed to a flatness of ≤0.05mm, and the parallelism between any circular plane and welding surface is ≤0.05mm.

[0077] Step 2: Assemble and locate

[0078] Align and fit the two pieces to be welded, and after fine-tuning the alignment, fix the relative position of the two pieces to be welded, use positioning pins for positioning, and adjust the relative position of the two pieces to be welded to make the relative runout of the circumference of the assembled pieces to be welded≤ 0.15mm, the assembly clearance of the welding surface in the free state is ≤0.1mm, and the parallelism between the upper and lower annular planes is ≤0.1mm, assembled.

[0079...

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PUM

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Abstract

The invention relates to the field of aero-engine turbine disc manufacturing, in particular to a connecting method of a powder high-temperature alloy double-spoke-plate hollow turbine disc. Aiming atthe problems brought by the specific design structure characteristics of semi-closure, hollow narrow cavity and large welding area of the double-spoke-plate turbine disc and the material selection characteristic of a novel powder high-temperature alloy, solid-phase diffusion bonding serves as a core, through technological measures such as welding interface precision preparation, diffusion bondingtechnological curve design and optimization and post-welding performance recovery heat treatment, an original connecting interface of a joint is eliminated, the reliable connection of the powder high-temperature alloy is achieved, and the structural integrity and the use performance of the turbine disc are improved. Compared with a traditional high-temperature alloy diffusion bonding process, theoriginal bonding interface of the bonding joint obtained through the method disappears, the high-temperature creep life exceeds a material standard value, the high-temperature low-cycle fatigue performance reaches 90% or above of the material standard value, and the design and use requirements of the hollow turbine disc are met.

Description

technical field [0001] The invention relates to the field of manufacturing turbine disks of aero-engines, in particular to a method for connecting hollow turbine disks of powder superalloy double-spoke plates. Background technique [0002] The double-spoke hollow turbine disk is a representative part of the international advanced high-performance engine, and it is also the preferred design structure of the new generation of high-performance engine in China. Its typical structure is as follows: figure 1 shown. The traditional turbine disk is a solid structure, cold air can only flow through the surface of the disk for cooling, resulting in uneven temperature distribution and large thermal stress of the turbine disk. Compared with the traditional turbine disk, cold air can directly flow into the cavity between the double-spoke plates, thereby realizing internal cooling of the disk body, improving the cooling effect of the disk body, reducing the amount of cooling air, and im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/02B23K20/14B23K20/24B23K20/26C21D9/32C21D9/50
CPCB23K20/026B23K20/14B23K20/24B23K20/26C21D9/32C21D9/50
Inventor 赵伟金莹刘悦徐彦强刘建涛
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION