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Difficultly-deformed nickel-based superalloy superplastic forming method

A high-temperature alloy and superplastic technology, applied in the field of forging, can solve problems such as low efficiency and complex process of hard-to-deform high-temperature alloy forgings

Active Publication Date: 2013-09-18
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008]The purpose of the present invention is to solve the problem of complex process, low efficiency and difficulty in obtaining a high-quality, uniform grain size distribution, No problems with surface cracks

Method used

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  • Difficultly-deformed nickel-based superalloy superplastic forming method
  • Difficultly-deformed nickel-based superalloy superplastic forming method
  • Difficultly-deformed nickel-based superalloy superplastic forming method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: Taking forging a Φ180mm cake blank as an example, this embodiment proposes a process for realizing superplastic forming of a difficult-to-deform superalloy, which is characterized in that it specifically includes the following steps:

[0026] step 1:

[0027]1) Preparation of forging billet, the billet is a deformed nickel-based superalloy strengthened by γ￠ phase or related to it. In this preferred embodiment, the GH4720Li alloy is used to hard coat the regular Φ100mm×240mm cylindrical rod blank. The initial grain size is 8μm, and the main chemical composition is C: 0.01; Al: 2.35; Ti: 4.95; Co: 15.0; Cr: 16.0; Mo: 3.05; W: 1.2; Fe: 0.2; B: 0.015; Zr: 0.035; S: 0.001; P: 0.01; Ni balance;

[0028] 2) Select hydraulic press equipment and forging dies, and select die materials (superalloy C: 0.01, Cr: 16.1, Al: 6.2, Mo: 9.1, W: 6.2, Ta: 3.1, Hf: 3.2, Ti: 2.9, B: 0.15, S: 0.001, Ni balance) can be stronger than this nickel-based superalloy under 1150 ℃ and...

Embodiment 2

[0033] Embodiment 2: Taking forging a Φ180mm cake blank as an example, this embodiment proposes a process for realizing superplastic forming of a difficult-to-deform superalloy, which is characterized in that it specifically includes the following steps:

[0034] step 1:

[0035] 6) Preparation of forging billet. The billet is a deformed nickel-based superalloy strengthened by γ￠ phase or related to it. In this preferred embodiment, the GH4720Li alloy is used to hard coat the regular Φ100mm×240mm cylindrical rod blank. The initial grain size is 8μm, and the main chemical composition is C: 0.0125; Al: 2.25; Ti: 5.25; Co: 15.5; Cr: 16.5; Mo: 2.75; W: 1.5; Fe: 0.2; B: 0.015; Zr: 0.035; S: 0.001; P: 0.01; Ni balance;

[0036] 7) Select hydraulic press equipment and forging dies, and select die materials (superalloy C: 0.01, Cr: 16.1, Al: 6.2, Mo: 9.1, W: 6.2, Ta: 3.1, Hf: 3.2, Ti: 2.9, B: 0.15, S: 0.001, Ni balance) can be stronger than this nickel-based superalloy under 1150 ℃ ...

Embodiment 3

[0041] Embodiment 3: Taking forging a Φ180mm cake blank as an example, this embodiment proposes a process for realizing superplastic forming of a difficult-to-deform superalloy, which is characterized in that it specifically includes the following steps:

[0042] step 1:

[0043] 11) Preparation of forging billet, the billet is a deformed nickel-based superalloy strengthened by γ￠ phase or related. In this preferred embodiment, the GH4720Li alloy is used to hard coat the regular Φ100mm×240mm cylindrical rod blank. The initial grain size is 8μm, and the main chemical composition is C: 0.015; Al: 2.75; Ti: 4.75; Co: 14.0; Cr: 15.5; Mo: 3.25; W: 1; Fe: 0.2; B: 0.015; Zr: 0.035; S: 0.001; P: 0.01;

[0044] 12) Select hydraulic press equipment and forging dies, and select die materials (superalloy C: 0.01, Cr: 16.1, Al: 6.2, Mo: 9.1, W: 6.2, Ta: 3.1, Hf: 3.2, Ti: 2.9, B: 0.15, S: 0.001, Ni balance) can be stronger than this nickel-based superalloy under 1150 ℃ and forging deforma...

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Abstract

The invention discloses a difficultly-deformed nickel-based superalloy superplastic forming method, relates to a difficultly-deformed nickel-based superalloy superplastic forming technique, and aims to solve the problems that during conventional preparation of the difficultly-deformed nickel-based superalloy with high strengthening phase content, the forming process is difficult, the deformation resistance is high, the difficultly-deformed nickel-based superalloy is easy to crack and difficult to recrystall. The difficultly-deformed nickel-based superalloy superplastic forming method is implemented by the following steps: 1, forging under an isothermal condition; 2, performing sub-solution temperature deformation; and 3, controlling the strain rate in a range of 0.0001-0.005 / s. By the difficultly-deformed nickel-based superalloy superplastic forming method, the thermal deformation of the difficultly-deformed superalloy is easier, thereby achieving superplastic forming; the difficultly-deformed nickel-based superalloy superplastic forming method is applicable to preparation of nickel-based superalloy turbine disk in the aerospace field and preparation of other high-temperature-resistant forged disks used in a high-temperature environment.

Description

technical field [0001] The invention belongs to the technical field of forging, and in particular provides a superplastic forming method for preparing hard-to-deform high-temperature alloy cake blank discs and the like. Background technique [0002] Improving the heat resistance of turbine components is an important basis for the development of advanced gas turbine engines. At present, among the deformable superalloys that can be applied in engineering, the sum of Al and Ti content of the new type of hard-to-deform nickel-based superalloy with the highest service temperature is as high as 7.5%. Discovering feasible scientific methods and theories, optimizing its deformation parameters to obtain superplastic deformation process and revealing its deformation mechanism, and realizing accurate tissue performance prediction have always been the goals pursued by many scientific researchers [Yu Qiuying, Dong Jianxin, Zhang Maicang, Zheng Lei. Thermodynamic calculation of the equil...

Claims

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Application Information

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IPC IPC(8): B21J5/02
Inventor 姚志浩于秋颖董建新张麦仓
Owner CENT IRON & STEEL RES INST
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