Manufacturing method for double-structure turbine disk

A manufacturing method and turbine disk technology, which is applied in the field of turbine disk manufacturing, can solve problems such as low cooling efficiency and inability to obtain larger temperature gradients, and achieve increased grain size gradients, increased fine-grain heat treatment processes, and increased temperature gradient effect

Inactive Publication Date: 2012-08-01
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Limited by the structure of the furnace body and the low cooling efficiency of the water coo

Method used

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  • Manufacturing method for double-structure turbine disk
  • Manufacturing method for double-structure turbine disk
  • Manufacturing method for double-structure turbine disk

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of powder superalloy material: Ni-based powder superalloy is selected as the base material of the turbine disk, and its composition is 0.03C; 2.2Al; 4.0W; 0.8Nb; 4.0Mo; 3.7Ti; 16.0Cr; 13.0Co; 0.2Fe; 0.05Mn; 0.03Zr; 0.05Si; 0.005P; 0.005S; 0.001H; 0.001N; 0.001O; 0.01Ce; The Ni-based powder superalloy is vacuum smelted, and the plasma rotating electrode atomization method is used to make powder (the powder size is 50-150 μm). 150MPa, the time is 4h).

[0025] Sheath: GH4133B superalloy with wall thickness δ=5mm is used for hard sheathing before forging;

[0026] Heat treatment before forging: at 1100°C, anneal the sheathed billet for 1 hour and cool in the furnace;

[0027] Near-isothermal forging: heat the billet to 1150°C at a heating rate of 10°C / s and keep it warm for 30 minutes; perform multi-directional forging on the billet on a THP-630A hydraulic press (mold temperature is 935°C; beam speed is 6mm / s)—specific For upsetting first, the deformation am...

Embodiment 2

[0033] Preparation of powdered superalloy materials: Vacuum melting of Ni-based powdered superalloys with the following components, plasma rotating electrode atomization method, vacuum degassing, sheathing, sealing and welding, and hot isostatic pressing at 1150-1200 °C Molding, molding pressure 100-200MPa, molding time 3-5h; its composition is 0.02~0.05C; 2.0~2.4Al; 3.8~4.2W; 0.6~1.0Nb; 3.8~4.2Mo; 3.5~3.9Ti; 15.5 ~16.5Cr; 12.5~13.5Co; ≤0.5Fe; 0.006~0.015B; ≤0.15Mn; 0.025~0.05Zr; ≤0.20Si; ≤0.015P; ≤0.015S; ;0.005-0.01Ce; Ta 0.01-0.2, the balance is nickel;

[0034] Encapsulation: the hot isostatic pressed powder superalloy prepared through the above steps is hard sheathed with GH4133B superalloy with wall thickness δ=3-5mm;

[0035] Heat treatment before forging: at 1080-1140°C, anneal the billet after hard sheathing for 30-90 minutes, furnace cooling;

[0036]Near-isothermal forging: heat the annealed billet to 1100-1200°C at a heating rate of 5-15°C / s, and keep it warm for...

Embodiment 3

[0040] The disc gradient heat treatment device of the present invention includes a resistance band 1, a thermocouple 2, an upper cooling pipeline 3, a circulating pump 4, an upper cooling box 5, a heat conducting salt 6, an upper furnace body 7, a terminal post 8, a lower furnace body 9, a lower Cooling duct 10 and lower cooling box 11 . Among them, thermocouple 2, upper cooling box 5, upper cooling pipeline 10, heat conduction salt 6 and circulation pump 4 are arranged on upper furnace body 7; , heat conduction salt 6 and circulating pump 4, high-performance resistance band 1 (0Cr27A17Mo2 iron chromium aluminum resistance band, rated heating temperature 1400 ° C, rated heating rate 10 ° C / s) is also arranged, and the edge of the disc-shaped part is tested. Radiant heating. Both the upper cooling box 3 and the lower cooling box 11 are filled with heat-conducting salt 6, the specific composition is 50% BaCl2, 30% KCl and 20% NaCl by mass ratio, and the cooling pipes are arra...

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Abstract

The invention discloses a manufacturing method for a double-structure turbine disk, which is used for solving the technical problems of small grain sizes and small gradients of the conventional disk edges and disk hubs. The technical scheme comprises the following steps of: preparing a powder high-temperature alloy material; encapsulating; performing heat treatment before forging; performing near isothermal forging; performing fine grain heat treatment and gradient heat treatment; and manufacturing the double-structure turbine disk. Due to the heat treatment before forging, the turbine disk has ASTM 13 level of grain sizes, and the requirement on the fine grain sizes of disk center parts is met preferentially; and the grain sizes of the disk edges are obviously increased to the ASTM 3 level of grain sizes after the gradient heat aftertreatment, and the requirement on coarse grain sizes of the disk edge parts is met. Compared with the manufacturing method of the background technical literature 1, the manufacturing method has the advantages that a fine grain heat treatment process is added, the temperature gradients during the gradient heat treatment are increased, and the grain sizes and the gradients of the disk centers and the disk edges are obviously increased.

Description

technical field [0001] The invention relates to a method for manufacturing a turbine disk, in particular to a method for manufacturing a double-structure turbine disk. Background technique [0002] Document 1 "Liu Jiantao, Tao Yu, Zhang Yiwen, Zhang Guoxing. Microstructure and mechanical properties of FGH96 alloy dual-performance disk. Journal of Materials Heat Treatment, 2010, 31: 71-74" discloses a method of "powder preparation → hot isostatic compacting → Isothermal forging forming → dual structure heat treatment" method of manufacturing dual performance discs. The rim of the turbine disk is a coarse-grain structure with an ASTM 5-6 grain size, and the hub part is a fine-grain structure with an ASTM 10-11 grain size. Grain size gradients were obtained at the rim and hub, but the dual performance did not fully meet expectations. The reason is that the rim does not have an ASTM grade 3 or coarser grain size and the hub does not have an ASTM grade 12 or finer grain size. ...

Claims

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Application Information

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IPC IPC(8): B22F3/16C22C19/03C22F1/10
Inventor 宁永权姚泽坤
Owner NORTHWESTERN POLYTECHNICAL UNIV
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