JP2778803B2 - Heat treatment method for Al-Li alloy hot formed parts - Google Patents
Heat treatment method for Al-Li alloy hot formed partsInfo
- Publication number
- JP2778803B2 JP2778803B2 JP2123199A JP12319990A JP2778803B2 JP 2778803 B2 JP2778803 B2 JP 2778803B2 JP 2123199 A JP2123199 A JP 2123199A JP 12319990 A JP12319990 A JP 12319990A JP 2778803 B2 JP2778803 B2 JP 2778803B2
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- Prior art keywords
- strength
- heat treatment
- phase
- alloy
- treatment method
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Investigating And Analyzing Materials By Characteristic Methods (AREA)
- Heat Treatment Of Steel (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明はAl−Li合金熱間成形部品の強度向上を図るた
めの熱処理方法に関する。Description: TECHNICAL FIELD The present invention relates to a heat treatment method for improving the strength of an Al—Li alloy hot-formed part.
Al−Li合金の析出強化相は、δ′（Al3Li）相、θ′
（Al3Cu）相、Ｓ′（Al2CuMg）相、T1（Al2CuLi）相、T
2（Al6CuLi3）相などである。これらの相が母相中に均
一かつ微細に析出することにより、強度が向上する。こ
れらの析出相のうち、Ｓ′相、T1相、T2相などは、転
位、亜粒界などの格子欠陥上に核生成しやすい。The precipitation strengthening phase of the Al-Li alloy is δ '(Al 3 Li) phase, θ'
(Al 3 Cu) phase, S '(Al 2 CuMg) phase, T 1 (Al 2 CuLi) phase, T
2 (Al 6 CuLi 3 ) phase. When these phases are uniformly and finely precipitated in the matrix, the strength is improved. Among these precipitated phases, S ′ phase, T 1 phase, T 2 phase and the like tend to form nuclei on lattice defects such as dislocations and sub-grain boundaries.
このため、Al−Li合金では、溶体化処理（−Ｗ状態）
後に成形するか、溶体化処理後にストレッチ又は圧延な
どの各種の塑性加工を行うことにより一定の歪を加えて
前述した析出相に対する析出サイトを導入してから成形
し、その後に時効処理（−T8状態）を行って、高強度化
を図るという熱処理方法が用いられている。For this reason, in the Al-Li alloy, the solution treatment (-W state)
Forming later, or performing various plastic workings such as stretching or rolling after the solution treatment, applying a certain strain to introduce the precipitation sites for the above-mentioned precipitation phase, then forming, and then aging treatment (−T8 State) to increase the strength.
しかし、超塑性成形部品を代表とする熱間成形部品
は、前述のように室温で成形する場合と異なり、熱間で
正寸に成形されるため、溶体化処理後にストレッチ、圧
延、成形などの冷間加工を行うことは不可能である。こ
のため、溶体化処理後ただちに時効処理（−T6状態）を
行い、使用に供している。また、熱間加工中に亜粒界な
どの下部組織が消失するため、通常の室温成形部品に比
べて、Ｓ′相、T1相、T2相などの析出サイトが大幅に少
なくなる。この結果、Al−Li合金の熱間成形部品は、時
効処理を行っても充分に強度を向上させることができな
い。However, unlike the case of forming at room temperature as described above, a hot-formed part typified by a superplastic formed part is formed into a precise size by hot, so that after solution treatment, stretching, rolling, forming, etc. It is impossible to perform cold working. For this reason, aging treatment (-T6 state) is performed immediately after the solution treatment and used. In addition, since substructures such as sub-grain boundaries disappear during hot working, precipitation sites such as S ′ phase, T 1 phase, and T 2 phase are significantly reduced as compared with normal room temperature molded parts. As a result, the strength of the hot-formed part of the Al-Li alloy cannot be sufficiently improved even after the aging treatment.
以上のように、超塑性成形を基本とする熱加工技術は
コスト低減、重量軽減を達成する有効な手段として拡大
基調にあるが、強度を充分に向上することができないと
いう問題があるため、この技術を適用する上で大きな障
害となっている。As described above, thermal processing technology based on superplastic forming is on an expanding trend as an effective means of achieving cost reduction and weight reduction, but there is a problem that strength cannot be sufficiently improved, It is a major obstacle to applying technology.
本発明の目的は、Al−Li合金の熱間成形部品の強度を
向上することができる熱処理方法を提供することにあ
る。An object of the present invention is to provide a heat treatment method capable of improving the strength of an Al—Li alloy hot-formed part.
本発明のAl−Li合金熱間成形部品の熱処理方法は、溶
質元素としてLi並びにCu及びMgのうち少なくともいずれ
か一方を含有するAl合金の熱間成形部品を、溶体化処理
した後、ショットピーニングを行い、更に時効処理を施
すことを特徴とするものである。The heat treatment method for an Al-Li alloy hot-formed part of the present invention is a method for subjecting a hot-formed part of an Al alloy containing at least one of Li and Cu and / or Mg as a solute element to a solution treatment, followed by shot peening. And further subject to aging treatment.
Al−Li合金の強度向上を図るためには、Ｓ′相、T
1相、T2相などの析出を促進することが必要である。そ
のためには、これらの析出相の析出サイトとなる転位や
歪を導入することが必要である。ショットピーニング
は、転位、歪などを導入させる作用を有する。そして、
ショットピーニングは、ストレッチ、圧延、成形などの
冷間加工と異なり、熱間成形部品のように正寸に成形さ
れている部品に対しても適用可能である。したがって、
部品の形状、寸法を維持したままで、２％の冷間圧延に
近い転位、歪を導入することができ、時効処理後の強度
を向上することができる。In order to improve the strength of the Al-Li alloy, the S 'phase, T
1-phase, it is necessary to facilitate precipitation of such T 2 phase. For that purpose, it is necessary to introduce dislocations and strains that serve as precipitation sites for these precipitation phases. Shot peening has the effect of introducing dislocations, strains and the like. And
Unlike cold working such as stretching, rolling, and forming, shot peening can be applied to a part that is formed to a full size such as a hot formed part. Therefore,
Dislocation and strain close to 2% cold rolling can be introduced while maintaining the shape and dimensions of the part, and the strength after aging treatment can be improved.
以下、本発明の実施例を説明する。 Hereinafter, embodiments of the present invention will be described.
Al−Li−Cu−Mg系の8090合金及びAl−Li−Cu系の2090
合金について、溶体化処理、ショットピーニング、時効
処理を行い（実施例１、２）、その強度を測定した。比
較のために、溶体化処理、時効処理（無加工）を行った
もの、溶体化処理、２％の冷間圧延、時効処理（冷間圧
延）を行ったものについても、同様に強度を測定した。
試料はASTMの標準試験片の形状・寸法（ただし、板厚は
2.0mm）とし、引張試験機により強度を測定した。これ
らの結果を第１図に示す。Al-Li-Cu-Mg 8090 alloy and Al-Li-Cu 2090 alloy
The alloy was subjected to solution treatment, shot peening, and aging (Examples 1 and 2), and the strength was measured. For comparison, the strength was similarly measured for those subjected to solution treatment and aging treatment (no processing), those subjected to solution treatment, 2% cold rolling and aging treatment (cold rolling). did.
The sample is the shape and dimensions of an ASTM standard test piece (however,
2.0 mm), and the strength was measured by a tensile tester. These results are shown in FIG.
なお、処理条件は以下の通りである。 The processing conditions are as follows.
溶体化処理:Ar雰囲気中、530℃で30分間熱処理した後、
水焼入れした。Solution treatment: After heat treatment at 530 ° C for 30 minutes in an Ar atmosphere,
Water quenched.
ショットピーニング（実施例１）：インテンシティ0.00
6±0.002Aで板の両面をショットした。Shot peening (Example 1): intensity 0.00
Both sides of the plate were shot at 6 ± 0.002A.
ショットピーニング（実施例２）：インテンシティ0.00
8±0.002Aで板の両面をショットした。Shot peening (Example 2): intensity 0.00
Both sides of the plate were shot at 8 ± 0.002A.
時効処理:190℃で16時間熱処理した。Aging treatment: Heat treatment was performed at 190 ° C. for 16 hours.
第１図からわかるように、本発明の方法で処理された
実施例１、２の試料は、従来の方法（無加工）で処理さ
れた試料よりも強度が大幅に改善され、溶体化処理後に
２％の冷間圧延を行った試料と同程度の強度を示してい
る。As can be seen from FIG. 1, the samples of Examples 1 and 2 treated by the method of the present invention have significantly improved strength compared to the samples treated by the conventional method (unprocessed), and after the solution treatment. It shows the same strength as the sample that has been cold rolled by 2%.
なお、ショットピーニングにより強度を向上させる効
果は、板厚、材質、時効条件に依存して変化するため、
各部品に対する適用性を見極めた上で実施することが好
ましい。The effect of improving the strength by shot peening varies depending on the sheet thickness, material, and aging conditions.
It is preferable to determine the applicability to each part before carrying out.
また、ショットピーニングは、疲労強度特性などの材
料特性の改善に利用されており、本発明においても強度
の向上のほかに、疲労強度特性など同様の材料特性の改
善効果が期待できる。In addition, shot peening is used to improve material properties such as fatigue strength properties, and in the present invention, in addition to the improvement in strength, similar effects of improving material properties such as fatigue strength properties can be expected.
以上詳述したように本発明方法を用いれば、Al−Li合
金熱間成形部品の形状、寸法を変えることなく、強度を
向上することができる。As described above in detail, by using the method of the present invention, the strength can be improved without changing the shape and dimensions of the Al—Li alloy hot formed part.
第１図は本発明の実施例における処理方法で処理された
試料の強度を示す特性図である。FIG. 1 is a characteristic diagram showing the strength of a sample processed by the processing method according to the embodiment of the present invention.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｃ２２Ｆ 1/00 ６８２ Ｃ２２Ｆ 1/00 ６８２ ６８４ ６８４Ｚ (56)参考文献 特開 昭62−297433（ＪＰ，Ａ) 特開 平２−43349（ＪＰ，Ａ) 特開 昭63−190150（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) C22F 1/00 C22F 1/04 - 1/057────────────────────────────────────────────────── (5) Int.Cl. 6 Identification symbol FI C22F 1/00 682 C22F 1/00 682 684 684Z (56) References JP-A-62-297433 (JP, A) JP-A-2 -43349 (JP, A) JP-A-63-190150 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) C22F 1/00 C22F 1/04-1/057
Claims (1)
なくともいずれか一方を含有するAl合金の熱間成形部品
を、溶体化処理した後、ショットピーニングを行い、更
に時効処理を施すことを特徴とするAl−Li合金熱間成形
部品の熱処理方法。1. A hot-formed part of an Al alloy containing at least one of Li, Cu and Mg as a solute element is subjected to solution treatment, shot peening and further aging treatment. Heat treatment method for hot-formed parts of Al-Li alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2123199A JP2778803B2 (en) | 1990-05-15 | 1990-05-15 | Heat treatment method for Al-Li alloy hot formed parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2123199A JP2778803B2 (en) | 1990-05-15 | 1990-05-15 | Heat treatment method for Al-Li alloy hot formed parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0421747A JPH0421747A (en) | 1992-01-24 |
| JP2778803B2 true JP2778803B2 (en) | 1998-07-23 |
Family
ID=14854648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2123199A Expired - Lifetime JP2778803B2 (en) | 1990-05-15 | 1990-05-15 | Heat treatment method for Al-Li alloy hot formed parts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2778803B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6251973B1 (en) | 1998-11-23 | 2001-06-26 | Akzo Nobel N.V. | Coatings and coating compositions of a reactive group-containing polymer, a hydrazide and a silane |
| JP6328410B2 (en) * | 2013-11-29 | 2018-05-23 | アイシン精機株式会社 | Manufacturing method of aluminum alloy member |
| CN109487183B (en) * | 2018-12-10 | 2020-11-27 | 同济大学 | Wet shot blasting surface modification method suitable for aluminum-lithium alloy |
| CN113249601B (en) * | 2021-05-18 | 2022-04-29 | 哈尔滨工业大学 | Alloying method for inducing icosahedron quasicrystal phase in-situ self-generated strengthening cast aluminum-lithium alloy |
| CN113584363A (en) * | 2021-07-29 | 2021-11-02 | 中北大学 | Surface strengthening method of 2024 aluminum alloy |
| CN113981341B (en) * | 2021-11-05 | 2022-04-26 | 西南铝业（集团）有限责任公司 | High-strength high-toughness corrosion-resistant 2196-T8511 aluminum lithium alloy extruded section and production process thereof |
-
1990
- 1990-05-15 JP JP2123199A patent/JP2778803B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0421747A (en) | 1992-01-24 |
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