Nickel-based deformation high temperature alloy being higher than 700 DEG C in service temperature and preparation method of same

A technology of deformed superalloy and service temperature, which is applied in the field of nickel-based deformed superalloy preparation, can solve the problems of thermoplastic deterioration, difficult and difficult to obtain alloy parts, etc., and achieve high reliability, broad application prospects and low cost.

Active Publication Date: 2017-12-01
CENT IRON & STEEL RES INST
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  • Abstract
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Problems solved by technology

[0003] Nickel-based superalloys in service at temperatures above 700 °C generally contain refractory elements such as Mo and W, and precipitation strengthening phase-forming elements such as Al, Ti, Nb, and Ta. The content of the strengthening phase γ' exceeds 40%, and the high alloying degree makes The degree of segregation of the alloy is intensified and the thermoplasticity is deteriorated. It is difficu

Method used

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  • Nickel-based deformation high temperature alloy being higher than 700 DEG C in service temperature and preparation method of same
  • Nickel-based deformation high temperature alloy being higher than 700 DEG C in service temperature and preparation method of same
  • Nickel-based deformation high temperature alloy being higher than 700 DEG C in service temperature and preparation method of same

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[0022] The preparation process of the alloy of the present invention is as follows (see figure 1 ):

[0023] The alloy adopts double vacuum smelting or triple smelting to prepare ingots with qualified components, and then undergoes multi-stage high-temperature homogenization treatment; then uses free forging to open billets to prepare fine-grained billets with uniform structure; then uses hot die forging or isothermal forging or rolling Forgings of required specifications and shapes are prepared by processes such as rings; finally, the forgings are heat-treated to obtain alloy parts with qualified microstructure and properties.

[0024] In the above method, the double vacuum smelting process is "vacuum induction melting + vacuum consumable remelting".

[0025] The triple smelting process is "vacuum induction melting + vacuum consumable remelting + vacuum consumable remelting" or "vacuum induction melting + electroslag remelting + vacuum consumable remelting".

[0026] The al...

Embodiment 1

[0036] In this embodiment, a certain high thrust-to-weight ratio aeroengine turbine disc component is selected.

[0037] Alloy composition in this example: Co: 12.8, Cr: 15.7, Mo: 4.0, W: 3.9; Al: 2.1, Ti: 3.6, Nb: 0.65, Ta: 0.05, B: 0.015, C: 0.007, Zr: 0.04, Mg: 0.05, V: 0.2, Fe: 0.5, Ce: 0.005, Ni balance. Among them, the rational optimization and adjustment of the ratio of alloying elements is the basis for the alloy of the present invention to be prepared by the casting-forging process.

[0038] The triple smelting process of "vacuum induction melting + electroslag remelting + vacuum consumable remelting" is used to prepare consumable remelting ingots with a diameter of 508 mm, high quality, low segregation, and no metallurgical defects.

[0039] The self-consumable remelting ingot undergoes multi-stage homogenization treatment to eliminate the low melting point phase and reduce the degree of dendrite segregation of elements. Based on the multi-cycle thermo-mechanical tr...

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Abstract

The invention discloses a nickel-based deformation high temperature alloy being higher than 700 DEG C in service temperature and a preparation method of same. The alloy includes, by weight, 11.0-14.0% of Co, 15.0-17.0% of Cr, 3.3-4.3% of Mo, 3.3-4.3% of W, 1.6-2.7% of Al, 3.0-4.0% of Ti, 0.6-1.2% of Nb, 0.005-1.2% of Ta, 0.005-0.02% of B, 0.005-0.05% of C, 0.02-0.07% of Zr, 0.001-0.1% of Mg, 0-2.0% of V, 0.2-4.5% of Fe, 0.001-0.01% of Ce and the balanced being Ni. By controlling the content of low-interstitial element C, adding microelements Ce and Mg which are beneficial to hot-working plasticity, and adding a certain amount of Ta for regulating the ratio of precipitation strengthening elements Al, Ti, Nb and Ta, the alloy has the similar comprehensive performance as a second-generation powder high temperature alloy FGH96 at above 700 DEG C, but is greatly reduced in cost than the latter. The alloy has high reliability, is low in whole-life cost and is high in production efficiency.

Description

technical field [0001] The invention relates to the technical field of nickel-based deformed superalloy preparation, in particular to a low-pressure turbine disc, compressor disc sealing disc, shaft, ring and other hot end components suitable for the preparation of high thrust-to-weight ratio aero-engines. The service temperature reaches 700 °C. Nickel-based deformed superalloy above ℃ and its preparation method. Background technique [0002] Aero-engines are gradually developing in the direction of high thrust-to-weight ratio and long life. At present, the thrust-to-weight ratio of advanced aero-engines at home and abroad has reached more than 12. Increasing the turbine inlet temperature is one of the ways to achieve high thrust. The higher the temperature, the higher the performance of the hot-end components such as the turbine disk of the engine, especially the high-temperature performance. The traditional deformed superalloy can no longer meet the use requirements. At t...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C30/00
CPCC22C19/056C22C30/00
Inventor 张北江黄烁张文云刘巧沐赵光普
Owner CENT IRON & STEEL RES INST
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