大直徑鋁錠熱頂鑄造中超聲施振深度的細晶機制

王瑩; 李曉謙; 李瑞卿; 田陽

doi:10.13374/j.issn2095-9389.2019.01.010

大直徑鋁錠熱頂鑄造中超聲施振深度的細晶機制

doi: 10.13374/j.issn2095-9389.2019.01.010

王瑩^{1, 2},
李曉謙^{1, 2, 3},
李瑞卿^{2, 3, ,},
田陽^{1, 2}

1.
中南大學機電工程學院, 長沙 410083
2.
高性能復雜制造國家重點實驗室, 長沙 410083
3.
中南大學輕合金研究院, 長沙 410083

基金項目:

國家自然科學基金資助項目 51475480

國家自然科學基金資助項目 51575539

國家自然科學基金資助項目 51605496

國家自然科學基金資助項目 U1637601

中南大學研究生自主探索創新資助項目 1053320171530

詳細信息

通訊作者:
李瑞卿, E-mail: lll87430@126.com

中圖分類號: TG148;TB559
計量
- 文章訪問數: 1115
- HTML全文瀏覽量: 329
- PDF下載量: 23
- 被引次數: 0
出版歷程
- 收稿日期: 2017-12-07
- 刊出日期: 2019-01-01

Fine grain mechanism of ultrasonic vibration depth in large diameter aluminum ingot hot-top casting

WANG Ying^{1, 2},
LI Xiao-qian^{1, 2, 3},
LI Rui-qing^{2, 3
, ,},
TIAN Yang^{1, 2}

1.
College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
2.
State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, China
3.
Light Alloy Research Institute, Central South University, Changsha 410083, China

More Information

Corresponding author: LI Rui-qing, E-mail: lll87430@126.com

摘要

摘要: 在直徑為650 mm的鋁合金熱頂半連續鑄造過程中施加雙源超聲振動系統, 研究3種超聲輻射桿浸入深度對鑄錠宏觀凝固組織的影響.基于鋁合金鑄錠凝固組織形貌的檢測結果以及ANSYS等有限元軟件對鑄造過程中聲場的仿真結果, 深入探討了超聲輻射桿在不同的施振深度下對鋁合金鑄錠凝固組織細化機制的影響.結果表明: 隨著超聲輻射桿施振深度的增加, 鑄錠截面組織整體進一步細化, 晶粒形狀由發達的枝晶變為等軸枝晶; 由于超聲輻射桿端面以及柱面存在幾個固定位置處振動波峰, 在鋁熔體中不同的超聲施振深度下存在不同的超聲空化范圍, 進而導致凝固組織的細化機制也不同.
- 鋁合金 /
- 熱頂鑄造 /
- 有限元法 /
- 振動波峰 /
- 超聲空化 /
- 細化機制
Abstract: With the development of the aerospace industry and the need for industrialized production, the casting processes of large diameter aluminum alloy ingot have come into focus in the industry. Among them, ultrasonic-assisted casting technology is widely used. Ultrasonic-assisted casting technology has the advantages of improving solute segregation of ingot and refining solidification organization. Other advantages have been widely reported. At present, most of the aluminum ingots used in the non-hot top ultrasonic casting process with very shallow liquid cavities, while the casting process does not involve the issue of ultrasonic vibration depth. With the use of a hot-top mold for ultrasound in the casting and casting process of large diameter ingot, the liquid level of aluminum melt is very high. The ultrasonic vibration depth will affect the cavitation range and finally affect the fine grain effect of the ingot. In the present study, a double source ultrasonic vibration system was applied in the process of semi-continuous casting of aluminum alloy with a diameter of 650 mm, and the influence of ultrasonic immersion depth on the macroscopic solidification structure of ingot was studied. Based on the test results of the solidified microstructure of aluminum alloy ingot and the simulation results of the sound field of the finite element software such as ANSYS, the mechanism of the microstructure refinement of the aluminum alloy ingot under different vibration depths was discussed at length. Study results show that, with increasing vibrational depth of the supersonic radiation rod, the whole cross section of the ingot is further refined, and grain shape changs from developed dendrites to equiaxed dendrites. Because of the end faces of the ultrasonic radiation rod, there is a vibrational peak at the fixed position, which leads to different ultrasonic cavities under different ultrasonic vibrational depths in the aluminum melt. This leads to different refinement mechanisms of the solidified structure.
- aluminum alloy /
- hot roof casting /
- finite element method /
- vibration peaks /
- ultrasonic cavitation /
- refinement mechanism

HTML全文

圖 1 鑄造及檢測示意圖(a)雙源超聲熱頂式鑄造；(b)凝固組織取樣位置

Figure 1. Casting and testing schematic: (a) hot-top dual-source ultrasonic casting; (b) solidified tissue sampling position

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圖 2 雙源超聲鑄造仿真模型

Figure 2. Dual-source ultrasonic casting simulation model

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圖 3 不同施振深度的鑄錠顯微組織(Ⅰ—未施加；Ⅱ—110 mm；Ⅲ—190 mm；Ⅳ—280 mm；A—中心處；B—1/2半徑附近；C—邊部)

Figure 3. Different casting depths of ingot microstructure(Ⅰ— not working; Ⅱ—110 mm; Ⅲ—190 mm; Ⅳ—280 mm; A—center; B—near 1/2 radius; C—edge)

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圖 4 顯微組織變化曲線

Figure 4. Distribution of grain size with four ingots

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圖 5 不同施振深度下的聲場分布. (a)H=110 mm；(b)H=190 mm；(c)H=280 mm

Figure 5. Distribution of sound field under different vibration depths: (a)H=110 mm; (b)H=190 mm; (c)H=280 mm

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圖 6 輻射桿柱面的聲場分布

Figure 6. Distribution of the sound field of the cylinder of the radiation rod

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圖 7 不同施振深度的超聲作用機制圖.(a)H=110 mm；(b)H=190 mm；(c)H=280 mm

Figure 7. Different vibration mechanisms at the depths of the ultrasound mechanism: (a)H=110 mm; (b)H=190 mm; (c)H=280 mm

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圖 8 不同施振深度的輻射桿腐蝕形貌. (a) 未施加; (b) 110 mm; (c) 190 mm; (d) 280 mm

Figure 8. Radiation rod with different depths of shock corrosion morphology: (a) not working; (b) 110 mm; (c) 190 mm; (d) 280 mm

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