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Superplastic heat treatment method for high-alloying nickel-based powder high-temperature alloy disc

A heat treatment method and technology of nickel-based powder, applied in the field of heat treatment, can solve the problems of low cycle fatigue performance and high temperature resistance, poor high temperature creep performance, low alloy strength, etc., and achieve reduced stress concentration, reduced tensile strength, The effect of nucleation density reduction

Active Publication Date: 2022-03-04
SINO EURO MATERIALS TECH OF XIAN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two conventional heat treatment methods for turbine discs made of nickel-based alloys: one is solid solution treatment in the (γ+γ`) dual-phase region, heat preservation for 3 to 4 hours, and then cooling at 20 to 30°C / min Cooling at a high speed, followed by a three-stage aging treatment at 700-910°C with different holding times. Under this process, the alloy has high strength, poor plasticity, insufficient low-cycle fatigue performance and high temperature resistance, and has notch sensitivity; the other The solid solution treatment is performed at 5-25°C above the γ` phase dissolution temperature for 6-8 hours, and then aged at 870°C. Under this process, the alloy strength is low, and the high-temperature creep performance is poor, and the alloy remains after treatment. notch sensitive

Method used

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  • Superplastic heat treatment method for high-alloying nickel-based powder high-temperature alloy disc
  • Superplastic heat treatment method for high-alloying nickel-based powder high-temperature alloy disc
  • Superplastic heat treatment method for high-alloying nickel-based powder high-temperature alloy disc

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1) Hot isostatic pressing to prepare high-alloyed nickel-based powder superalloy disk blank; wherein, the alloy composition ratio is (wt%): Co: 16%, Cr: 9%, W: 5.5%, Mo: 4% , Al: 5.1%, Ti: 1.9%, Nb: 2.7%, C: 0.04%, Hf: ≤ 0.015%, B: ≤ 0.015%, O: ≤ 50ppm, N: ≤ 50ppm, Ni is the balance;

[0041] 2) Carry out rough turning processing on the plate blank according to the drawing and fillet R10;

[0042] 3) Put the disk blank obtained in step 2) into a resistance furnace for solution treatment at 10°C above the melting temperature of γ`, and after solution treatment for 4 hours, cool to room temperature at 50°C / min;

[0043] 4) Put the disk blank obtained in step 3) into a resistance furnace for secondary solution treatment at 20°C below the melting temperature of γ`, after the second solution treatment time of 1 hour, then cool to room temperature at 50°C / min;

[0044] 5) Perform aging treatment on the disc blank obtained in step 4) at 10° C. above the M23C6 precipitation te...

Embodiment 2

[0047] 1) Hot isostatic pressing to prepare high-alloyed nickel-based powder superalloy disk blank; wherein, the alloy composition ratio is (wt%): Co: 15%, Cr: 10%, W: 5.2%, Mo: 4.2% , Al: 5.0%, Ti: 2.0%, Nb: 2.6%, C: 0.06%, Hf: ≤0.015%, B: ≤0.015%, O: ≤50ppm, N: ≤50ppm, Ni is the balance;

[0048] 2) Carry out rough turning processing on the plate blank according to the drawing and fillet R15mm;

[0049] 3) Put the disk blank obtained in step 2) into a resistance furnace for solution treatment at 20°C above the melting temperature of γ`, and after solution treatment for 5 hours, cool to room temperature at 65°C / min;

[0050] 4) Put the disk blank obtained in step 3) into a resistance furnace for secondary solution treatment at 30°C below the melting temperature of γ`, after the second solution treatment time of 2 hours, then cool to room temperature at 65°C / min;

[0051] 5) the disk base that step 4) obtains is in M 23 C 6 Aging treatment is carried out at 15°C above the p...

Embodiment 3

[0054] 1) Hot isostatic pressing to prepare high-alloyed nickel-based powder superalloy disk billet; wherein, the alloy composition ratio is (wt%): Co: 16.5%, Cr: 8%, W: 5.9%, Mo: 3.5% , Al: 5.3%, Ti: 1.8%, Nb: 2.8%, C: 0.06%, Hf: ≤ 0.015%, B: ≤ 0.015%, O: ≤ 50ppm, N: ≤ 50ppm, Ni is the balance;

[0055] 2) Carry out rough turning processing on the plate blank according to the drawing and fillet R20mm;

[0056] 3) Put the disk blank obtained in step 2) into a resistance furnace for solution treatment at 30°C above the melting temperature of γ`, and after solution treatment for 6 hours, cool to room temperature at 80°C / min;

[0057] 4) Put the disc blank obtained in step 3) into a resistance furnace for secondary solution treatment at 40°C below the melting temperature of γ`, after the second solution treatment time is 3 hours, then cool to room temperature at 80°C / min;

[0058] 5) Perform aging treatment on the disc blank obtained in step 4) at 20° C. above the M23C6 precipit...

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Abstract

The invention discloses a superplastic heat treatment method for a high-alloying nickel-based powder high-temperature alloy disc. The superplastic heat treatment method comprises the following steps: firstly, obtaining a high-alloying nickel-based powder high-temperature alloy disc blank through a hot isostatic pressing technology; then rough machining and rounding are conducted; then, two times of solution treatment are carried out, on one hand, the size of a primary gamma phase playing a strengthening role on a grain boundary is increased, on the other hand, the supersaturation degree of an intragranular secondary gamma phase after solution treatment is reduced through secondary solution treatment, the nucleation density of the intragranular secondary gamma phase is reduced, the elastic strain energy is increased, and therefore the secondary gamma phase is controlled to grow into a rounded square; and finally, through two times of aging treatment, the type and number of carbides are controlled, gamma phases are supplemented and separated out in crystals for three times to fill a matrix channel, and the alloy structure is stabilized. Compared with a traditional heat treatment process, the alloy structure can be adjusted, so that the strength and plasticity of the alloy are balanced, meanwhile, the alloy notch sensitivity is reduced, and the requirement of an aero-engine disc for the comprehensive performance of the high-temperature alloy is met.

Description

technical field [0001] The invention belongs to the technical field of heat treatment, and in particular relates to a superplastic heat treatment method for a highly alloyed nickel-based powder superalloy disk. Background technique [0002] High-alloyed nickel-based powder superalloys are mainly used to manufacture hot-end parts such as aero-engine turbine disks. With the improvement of engine performance, the thrust-to-weight ratio, gas temperature before the turbine, and compressor boost ratio continue to increase, while the compressor and turbine stages However, the number gradually decreases, so that the single-stage load continues to increase, the stress level of the parts is getting higher and higher, and the working conditions are getting worse. There are extremely strict requirements on the high-temperature strength, fatigue performance and durability of the material. In order to improve the temperature bearing capacity of the alloy, the type and content of alloying ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/10C22C19/05
CPCC22F1/10C22C19/056C22C19/057
Inventor 宋嘉明张安琴瞿宗宏罗成刘海浪王泽钰赖运金王庆相梁书锦
Owner SINO EURO MATERIALS TECH OF XIAN CO LTD
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