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

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

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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

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Claims

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Application Information

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Owner CENT IRON & STEEL RES INST
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