JPH07310150A - Method for heat-treating aluminum alloy - Google Patents
Method for heat-treating aluminum alloyInfo
- Publication number
- JPH07310150A JPH07310150A JP15784294A JP15784294A JPH07310150A JP H07310150 A JPH07310150 A JP H07310150A JP 15784294 A JP15784294 A JP 15784294A JP 15784294 A JP15784294 A JP 15784294A JP H07310150 A JPH07310150 A JP H07310150A
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- Japan
- Prior art keywords
- solution treatment
- treatment
- temperature
- alloy
- time
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- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明はＡｌ−Ｓｉ系、Ａｌ−
Ｍｇ系、Ａｌ−Ｃｕ系等のアルミニウム合金のＴ6熱処
理に関し、特に溶体化処理に関する。FIELD OF THE INVENTION The present invention relates to Al--Si system, Al--
The present invention relates to a T 6 heat treatment of an aluminum alloy such as a Mg type or an Al—Cu type, and particularly to a solution heat treatment.
【０００２】[0002]
【従来の技術】この種合金（例えばＡｌ−Ｓｉ系合金）
のＴ6熱処理は従来より、共晶点よりも５７℃程度低い
温度、すなわち５２０℃程度で５〜６Ｈｒ以上保持した
後に急冷する溶体化処理を行ない、次いで２００℃以下
で４〜１０Ｈｒ保持する時効処理を行なっていた。2. Description of the Related Art This type of alloy (for example, Al--Si alloy)
Conventionally, the T 6 heat treatment is carried out at a temperature lower than the eutectic point by about 57 ° C., that is, at about 520 ° C. for 5 to 6 hours or more, followed by quenching, then solution treatment, and then at 200 ° C. or less for 4 to 10 hours. It was processing.
【０００３】[0003]
【発明が解決しようとする課題】上記従来の溶体化処理
は５〜６Ｈｒ以上もの長時間を必要とするから、生産性
が低いと共に、エネルギー消費量が大きいという問題点
があった。したがって本発明は、生産性が高く且つエネ
ルギー消費量が少ないアルミニウム合金の熱処理方法を
提供することを目的とする。The above-mentioned conventional solution treatment requires a long time of 5 to 6 hours or more, so that there are problems that productivity is low and energy consumption is large. Therefore, an object of the present invention is to provide a heat treatment method for an aluminum alloy, which has high productivity and consumes less energy.
【０００４】[0004]
【課題を解決するための手段】本発明は、鋳造した鋳物
を急速に昇温し、共晶点近傍に到達した後に急冷し、し
かる後に時効処理を行うアルミニウム合金の熱処理方法
によって、上記目的を達成したものである。Means for Solving the Problems The present invention provides a heat treatment method for an aluminum alloy, in which the temperature of a cast casting is rapidly raised, when it reaches a temperature near the eutectic point, it is rapidly cooled, and then an aging treatment is performed. It has been achieved.
【０００５】[0005]
【実施例】ＪＩＳ−ＡＣ４ＣＨのＡｌ−Ｓｉ系合金を鋳
造し、試料を切り出し、共晶点５７７℃の直下の５７０
℃において各種の溶体化処理時間だけ溶体化処理を行な
い、１４５℃において各種の時効処理時間だけ時効処理
を行なった。しかる後に引張強さ、シャルピー吸収エネ
ルギーなどを測定した。ここで溶体化処理時間は次のよ
うに規定した。すなわち予め設定温度５７０℃に保たれ
た炉内に試料を挿入すると、炉温はいったん低下する
が、再び設定温度に回復する。この設定温度に回復した
時点から、水（０℃）焼入れを行なうまでの時間を溶体
化処理時間と規定した。また試料の化学組成は、Ｓｉ：
７．１９重量％、Ｍｇ：０．３７重量％、Ｆｅ：０．１
１重量％、Ｚｎ：０．０１重量％、Ｔｉ：０．１０重量
％、Ｓｒ：８７ｐｐｍであった。EXAMPLE A JIS-AC4CH Al-Si alloy was cast, a sample was cut out, and 570 was placed just below the eutectic point of 577 ° C.
The solution treatment was carried out at various temperatures for various solution treatment times at ℃, and the aging treatment was carried out for various aging treatment times at 145 ° C. After that, tensile strength, Charpy absorbed energy, etc. were measured. Here, the solution treatment time was defined as follows. That is, when the sample is inserted into the furnace which is kept at the preset temperature of 570 ° C., the furnace temperature is once lowered, but is restored to the set temperature again. The time from the point of time when the temperature was restored to the set temperature to the time of quenching with water (0 ° C.) was defined as the solution treatment time. The chemical composition of the sample is Si:
7.19% by weight, Mg: 0.37% by weight, Fe: 0.1
The content was 1% by weight, Zn: 0.01% by weight, Ti: 0.10% by weight, and Sr: 87 ppm.
【０００６】図１は溶体化処理時間をパラメータとし
て、時効処理時間に対する引張強さを示した実験結果で
ある。図より明らかなように、溶体化処理直後の引張強
さは、溶体化処理時間の短いものほど高い値を示してお
り、時効処理の進展後もこの傾向は保たれている。図２
は同じく溶体化処理時間をパラメータとして、時効処理
時間に対するシャルピー吸収エネルギーを示した実験結
果である。この場合も引張強さのときと同様に、溶体化
処理直後のシャルピー吸収エネルギーは、溶体化処理時
間の短いものほど高い値を示しており、時効処理の進展
後もこの傾向は保たれている。以上のごとく鋳造した鋳
物を共晶点近傍にまで加熱して溶体化処理を行なう場合
には、溶体化処理時間０のケース、すなわち試料の温度
を溶体化処理温度にまで昇温した後にその温度で保持す
ることなく直ちに水焼入れするケースが、最も機械的性
質に優れていることが解る。FIG. 1 is an experimental result showing the tensile strength with respect to the aging treatment time with the solution treatment time as a parameter. As is clear from the figure, the tensile strength immediately after the solution treatment shows a higher value as the solution treatment time becomes shorter, and this tendency is maintained even after the progress of the aging treatment. Figure 2
Is also an experimental result showing the Charpy absorbed energy with respect to the aging treatment time, with the solution treatment time as a parameter. Also in this case, as in the case of the tensile strength, the Charpy absorbed energy immediately after the solution treatment shows a higher value as the solution treatment time becomes shorter, and this tendency is maintained even after the progress of the aging treatment. . In the case of performing solution treatment by heating the casting cast as described above to near the eutectic point, the case of solution treatment time 0, that is, after raising the temperature of the sample to the solution treatment temperature, the temperature It can be seen that the case where water quenching is immediately performed without holding at, has the best mechanical properties.
【０００７】次に溶体化処理温度を５７０℃とした場合
と５２０℃とした場合について、共晶Ｓｉの円形度係数
を測定したところ、円形度係数の平均値は、従来の５２
０℃溶体化処理では０．５９７であったのに対して、５
７０℃溶体化処理では０．６７３であった。また円形度
係数が１以上のものの割合は、５２０℃溶体化処理では
５．４％であったのに対して、５７０℃溶体化処理では
１９．５％であり、共晶Ｓｉの球状化の進行が確認でき
た。すなわちＡｌ−Ｓｉ系合金で晶出する金属Ｓｉのリ
ーディング・エッヂ部が高温短時間で円形度が得られる
こと、またアルミ地に対するＳｉの固溶が高温短時間で
拡散することが解った。なお本実施例の溶体化処理温度
は、共晶点５７７℃よりも７℃低い５７０℃としたが、
共晶点よりも約２０℃低い温度以上であれば、共晶Ｓｉ
の球状化を進行させることができる。また溶体化処理温
度への昇温率は特に重要ではないから、生産性向上の観
点から急速に昇温することが好ましい。この場合、溶体
化処理温度に到達した後に直ちに冷却するから、共晶点
よりも約１０℃高い温度以下に昇温させることができ
る。Next, when the solution treatment temperature was set to 570 ° C. and 520 ° C., the circularity coefficient of eutectic Si was measured, and the average circularity coefficient was 52.
While it was 0.597 in the solution treatment at 0 ° C, it was 5
It was 0.673 in the solution treatment at 70 ° C. The ratio of those having a circularity coefficient of 1 or more was 5.4% in the solution treatment at 520 ° C, whereas it was 19.5% in the solution treatment at 570 ° C. I was able to confirm the progress. That is, it was found that the leading edge portion of the metallic Si crystallized by the Al-Si alloy can obtain circularity in a high temperature and a short time, and that the solid solution of Si in the aluminum base diffuses in a high temperature and a short time. The solution treatment temperature in this example was 570 ° C., which was 7 ° C. lower than the eutectic point 577 ° C.
If the temperature is about 20 ° C. lower than the eutectic point, the eutectic Si
The spheroidization can be promoted. Further, since the rate of temperature rise to the solution treatment temperature is not particularly important, it is preferable to raise the temperature rapidly from the viewpoint of improving productivity. In this case, since cooling is performed immediately after reaching the solution treatment temperature, it is possible to raise the temperature to a temperature about 10 ° C. higher than the eutectic point or lower.
【０００８】[0008]
【発明の効果】本発明による溶体化処理は、共晶点近傍
にまで急速に昇温した後に急冷するものであるから、鋳
物の重量によっても異なるが、約１時間以内で溶体化処
理を行なうことができる。したがって鋳物の生産性は高
くなり、また溶体化処理温度自体は高くなるものの保持
時間が殆どなくなるから、結局エネルギー消費量も著し
く減少する。EFFECTS OF THE INVENTION The solution heat treatment according to the present invention is performed by rapidly raising the temperature to the vicinity of the eutectic point and then rapidly cooling it. Therefore, the solution heat treatment is performed within about 1 hour, although it depends on the weight of the casting. be able to. Therefore, the productivity of the casting is increased, and the solution treatment temperature itself is increased, but the holding time is almost eliminated, so that the energy consumption is also remarkably reduced.
【図１】時効処理時間に対する引張強さを示す図FIG. 1 is a diagram showing tensile strength with respect to aging treatment time.
【図２】時効処理時間に対するシャルピー吸収エネルギ
ーを示す図FIG. 2 is a diagram showing Charpy absorbed energy with respect to aging treatment time.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 鷹合 徹也 山梨県甲府市宮前町４の３ ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuya Takago 4-3, Miyamaecho, Kofu City, Yamanashi Prefecture
Claims (1)
に到達した後に急冷し、しかる後に時効処理を行うアル
ミニウム合金の熱処理方法。1. A heat treatment method for an aluminum alloy, in which the temperature of a cast metal product is rapidly raised, when it reaches the vicinity of the eutectic point, it is rapidly cooled, and then an aging treatment is carried out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15784294A JP3738912B2 (en) | 1994-05-12 | 1994-05-12 | Heat treatment method of aluminum alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15784294A JP3738912B2 (en) | 1994-05-12 | 1994-05-12 | Heat treatment method of aluminum alloy |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2004094664A Division JP2004183106A (en) | 2004-03-29 | 2004-03-29 | Solution heat treatment furnace for aluminum alloy casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07310150A true JPH07310150A (en) | 1995-11-28 |
| JP3738912B2 JP3738912B2 (en) | 2006-01-25 |
Family
ID=15658547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15784294A Expired - Lifetime JP3738912B2 (en) | 1994-05-12 | 1994-05-12 | Heat treatment method of aluminum alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3738912B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001016387A1 (en) * | 1999-08-31 | 2001-03-08 | Asahi Tec Corporation | Cu-FREE CAST ALUMINUM ALLOY AND METHOD OF HEAT TREATMENT FOR PRODUCING THE SAME |
| WO2002012582A1 (en) * | 2000-08-08 | 2002-02-14 | Asahi Tec Corporation | Aluminum alloy formed by precipitation hardening and method for heat treatment thereof |
| CN103889746A (en) * | 2011-10-11 | 2014-06-25 | Ksm铸造集团有限公司 | Cast part |
-
1994
- 1994-05-12 JP JP15784294A patent/JP3738912B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001016387A1 (en) * | 1999-08-31 | 2001-03-08 | Asahi Tec Corporation | Cu-FREE CAST ALUMINUM ALLOY AND METHOD OF HEAT TREATMENT FOR PRODUCING THE SAME |
| US6773665B1 (en) | 1999-08-31 | 2004-08-10 | Asahi Tec Corporation | Non-Cu-based cast Al alloy and method for heat treatment thereof |
| WO2002012582A1 (en) * | 2000-08-08 | 2002-02-14 | Asahi Tec Corporation | Aluminum alloy formed by precipitation hardening and method for heat treatment thereof |
| CN103889746A (en) * | 2011-10-11 | 2014-06-25 | Ksm铸造集团有限公司 | Cast part |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3738912B2 (en) | 2006-01-25 |
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