JPS5848022B2 - High toughness aluminum alloy for casting - Google Patents
High toughness aluminum alloy for castingInfo
- Publication number
- JPS5848022B2 JPS5848022B2 JP7636776A JP7636776A JPS5848022B2 JP S5848022 B2 JPS5848022 B2 JP S5848022B2 JP 7636776 A JP7636776 A JP 7636776A JP 7636776 A JP7636776 A JP 7636776A JP S5848022 B2 JPS5848022 B2 JP S5848022B2
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- casting
- aluminum alloy
- strength
- high toughness
- Prior art date
- 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
Links
Landscapes
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Description
【発明の詳細な説明】
本発明は靭性とくに耐衝撃性および耐回転疲労性にすぐ
れ、且つ高い抵張力を有する鋳造用アルミニウム合金に
関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an aluminum alloy for casting that has excellent toughness, particularly impact resistance and rotational fatigue resistance, and high tensile strength.
自動車用保安部品であるホイールに使用されるアルミニ
ウム合金は強度安全面が非常に重要であり、鋳物の健全
性はもちろん、靭性とくに耐衝撃性、耐回転疲労性、耐
圧性等の機械的諸性質が十分良好であることが要求され
る。Strength and safety are extremely important for aluminum alloys used in wheels, which are safety parts for automobiles.In addition to the soundness of the casting, various mechanical properties such as toughness, especially impact resistance, rotational fatigue resistance, and pressure resistance are important. is required to be sufficiently good.
従来、こうした諸性質を比較的満足するものとしてＡｌ
−Ｓｉ−Ｍｇ系のＡ３５６合金等が使用されている。Conventionally, Al has been used as a material that relatively satisfies these properties.
-Si-Mg based A356 alloy etc. are used.
これ等の合金は一般に強度および伸びを出すために、鋳
造後溶体化処理および焼戻し処理の２段熱処理をほどこ
して使用されているが、そのままではホイールに要求さ
れる靭性、耐衝撃性、抗張力等の諸性質を十分に満足す
ることは困難である。These alloys are generally used after being subjected to a two-step heat treatment of solution treatment and tempering after casting in order to increase their strength and elongation. It is difficult to fully satisfy the various properties of
本発明による合金は、これまでのＡ３５６合金の焼戻し
処理過程におけるＭｇ２Ｓｉの析出による靭性および耐
衝撃性の著しい低下を改善し、Ｚｎ，Ｍｇ，Ｓｂ，Ｃｅ
およびＣｄをマトリックス中に固溶または析出させるこ
とにより靭性を劣化させることなく強度を向上させたも
のである。The alloy according to the present invention improves the significant decrease in toughness and impact resistance due to the precipitation of Mg2Si during the tempering process of A356 alloy, and
By dissolving or precipitating Cd in the matrix, the strength is improved without deteriorating the toughness.
従って、溶体化処理後焼戻し処理を行なうことなく高靭
性、高強度が得られる。Therefore, high toughness and high strength can be obtained without performing tempering treatment after solution treatment.
この場合、溶体化処理は針状に或長した共晶Ｓｉの粒状
化を促進し、共晶Ｓｉの切り欠き効果の軽減による靭性
、耐衝撃性および強度の改善を主な目的と′している。In this case, the main purpose of solution treatment is to promote the granulation of elongated eutectic Si in the form of needles, and to improve toughness, impact resistance, and strength by reducing the notch effect of eutectic Si. There is.
このため溶体化処理温度からの冷却は炉冷または空冷に
よって威され、後に焼戻し処理を行なう場合と異なり急
冷（焼入れ）を行なう必要はない。For this reason, cooling from the solution treatment temperature is accomplished by furnace cooling or air cooling, and there is no need to perform rapid cooling (quenching), unlike when tempering is performed later.
従って、焼入れによる歪の問題も著しく軽減される。Therefore, the problem of distortion due to hardening is also significantly reduced.
次に各元素の選択および組或限定理由について述べる。Next, the selection of each element and the reasons for limiting the combination will be described.
ＳｉはＡ７−Ｓｉ系合金の鋳造性を良好ならしめるため
６．０％以上添加するが、８．０％を越えると強度、伸
びを著しく劣化せしめるので６．０〜８．０％とした。Si is added in an amount of 6.0% or more in order to improve the castability of the A7-Si alloy, but if it exceeds 8.0%, the strength and elongation will be significantly deteriorated, so it is added in an amount of 6.0 to 8.0%.
ＺｎおよびＭｇは強度の向上に有効であるが、前者は０
．０５％より少ないとあまり効果がなく、また０．３％
を越えると伸びの低下が著しいため０．０５〜０．３％
に限定した。Zn and Mg are effective in improving strength, but the former has 0
．． Less than 0.05% is not very effective, and 0.3%
If it exceeds 0.05 to 0.3%, the elongation decreases significantly.
limited to.
また、後者は０．１％より少ないとあまり効果的ではな
＜、０．３％を越えるとＺｎの場合と同様に伸びの低下
が顕著となるために０．１〜０．３％に限定した。In addition, the latter is not very effective if it is less than 0.1%, and if it exceeds 0.3%, the elongation decreases noticeably as in the case of Zn, so it is limited to 0.1 to 0.3%. did.
Ｓｂ，Ｃｅ，Ｃｄはいずれも伸びあるいは靭性の改善に
有効である。Sb, Ce, and Cd are all effective in improving elongation or toughness.
しかし、ＳｂＯ、０５、ＣｅＯ．０ ５、Ｃｄ Ｏ．１
％より少ないとその効果があまりなく、またＳｂＯ．３
、ＣｅＯ．２、Ｃｄ０．２％を越えると伸びを低下させ
るのでＳｂＯ．０５〜０．３％、Ｃ ｅ Ｏ．０ ５
〜０．２％、ＣｄＯ．１−０．２％とした。However, SbO, 05, CeO. 0 5, CdO. 1
%, the effect is not so great, and SbO. 3
, CeO. 2. SbO. 05-0.3%, CeO. 0 5
~0.2%, CdO. It was set at 1-0.2%.
本発明合金とＡ３５６合金との化学組威を第１表に、ま
た鋳造後前者には溶体化処理のみを、後者には溶体化処
理及び焼戻し処理の２段熱処理を行なった場合の機械的
性質の比較の一例を第２表＊＊に示す。Table 1 shows the chemical composition of the present invention alloy and A356 alloy, and the mechanical properties when the former was subjected to only solution treatment after casting, and the latter was subjected to two-stage heat treatment of solution treatment and tempering treatment. An example of comparison is shown in Table 2**.
第２表から明らかなように、本発明合金はＡ３５６合金
に比べ引張強さ及び硬度においては僅かな向上しか認め
られないが、伸び及び衝撃値においては顕著な向上が認
められる。As is clear from Table 2, the alloy of the present invention shows only a slight improvement in tensile strength and hardness compared to the A356 alloy, but a significant improvement in elongation and impact value.
また、本発明合金はＡ３５６合金と同等な鋳造性を有し
ている。Furthermore, the alloy of the present invention has castability equivalent to that of A356 alloy.
Ａ３５６合金が比較的良好な鋳造性をもつ合金であるこ
とを考慮すれば、鋳造欠陥のない鋳物を製造することが
可能であり、且つ高靭性高強度の製品を得ることが期待
できる。Considering that A356 alloy is an alloy with relatively good castability, it is possible to produce castings without casting defects, and it is expected that products with high toughness and high strength can be obtained.
更に、本発明合金の最も大きな特徴は溶体化処理のみの
一段熱処理で使用できることであり、従って省エネルギ
ー型の高靭性・高強度アルミニウム合金であると考えら
れる。Furthermore, the most significant feature of the alloy of the present invention is that it can be used in a single heat treatment involving only solution treatment, and is therefore considered to be an energy-saving, high-toughness, high-strength aluminum alloy.
本発明合金を用いて低圧鋳造法により鋳造された自動車
用ホイールのＪＷＬ規格に基づいた熱処理後の３００荷
重落下衝撃試験結果を第３表に示す。Table 3 shows the results of a 300-load drop impact test after heat treatment based on the JWL standard for automobile wheels cast by the low-pressure casting method using the alloy of the present invention.
Ａ３５６合金を用いて製造されたホイールのＴ６処理後
および本発明合金を用いたホイールのＴ４処理後におい
て７インチ、９インチおよび１１インチ高さからの荷重
落下衝撃を与えたがいずれも試験後の状態は健全であっ
た。After the T6 treatment of a wheel manufactured using A356 alloy and after the T4 treatment of a wheel manufactured using the alloy of the present invention, a load drop impact was applied from a height of 7 inches, 9 inches, and 11 inches, but in both cases the results were obtained after the test. The condition was healthy.
また、このホイールのフランジ部から切り出した試験片
の機械的性質の比較を第４表に示しているが、本発明合
金を用いたホイールの機械的性質がＡ３５６合金を用い
たものに比べ良好であることが明らかである。Table 4 shows a comparison of the mechanical properties of test pieces cut from the flange of this wheel, and it shows that the mechanical properties of the wheel using the alloy of the present invention are better than those using the A356 alloy. One thing is clear.
本発明合金は、これまで発表されている種々の鋳造用ア
ルミニウム合金と異なり、溶体化処理のみで使用でき、
且つ高靭性高強度を有する極めて実用性に富んだ省エネ
ルギー型のアルミニウム合金である。The alloy of the present invention, unlike various aluminum alloys for casting that have been announced so far, can be used only by solution treatment.
Moreover, it is an extremely practical and energy-saving aluminum alloy that has high toughness and strength.
Claims (1)
〜０．３％、Ｍｇ０．１〜０．３％、Ｓｂ０．０５〜０
．３％、Ｃ ｅ Ｏ．０ ５〜０． ２％、ＣｄＯ．１
〜０．２％、残部がＡ［および不純物元素から戊ること
を特徴とする高靭性鋳造用アルミニウム合金。1 Si 6.0-8.0%, Zn0.05 by weight ratio
~0.3%, Mg0.1-0.3%, Sb0.05-0
．． 3%, CeO. 0 5~0. 2%, CdO. 1
A high-toughness aluminum alloy for casting, characterized in that the balance is free from A and impurity elements by ~0.2%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7636776A JPS5848022B2 (en) | 1976-06-30 | 1976-06-30 | High toughness aluminum alloy for casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7636776A JPS5848022B2 (en) | 1976-06-30 | 1976-06-30 | High toughness aluminum alloy for casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS532317A JPS532317A (en) | 1978-01-11 |
| JPS5848022B2 true JPS5848022B2 (en) | 1983-10-26 |
Family
ID=13603366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7636776A Expired JPS5848022B2 (en) | 1976-06-30 | 1976-06-30 | High toughness aluminum alloy for casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5848022B2 (en) |
-
1976
- 1976-06-30 JP JP7636776A patent/JPS5848022B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS532317A (en) | 1978-01-11 |
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