本文選題：Al-Si-.Mg合金 + 凝固變形　； 參考：《鑄造》2017年11期

【摘要】：本研究以一維長桿鑄件為對(duì)象,采用K型熱電偶與數(shù)據(jù)分析軟件研究了亞共晶Al-7Si-0.6Mg合金的凝固變形規(guī)律。結(jié)果表明:固定體積下,隨著鑄件模數(shù)與長寬比的增加,初晶析出溫度與二元共晶反應(yīng)溫度隨之上升,第一冷卻速度、第二冷卻速度與整體凝固冷卻速度連續(xù)下降;受鑄件/鑄型界面換熱影響,起始凝固部位體積收縮產(chǎn)生氣隙并沿邊線逐漸向心部區(qū)域擴(kuò)展,凝固溫差誘發(fā)產(chǎn)生的熱應(yīng)力受鑄型剛性約束作用,鑄件產(chǎn)生撓曲變形,寬度方向凝固尺寸變形量符合Lorentz數(shù)學(xué)函數(shù)分布,且隨鑄件長寬比降低逐漸下降,高度方向符合Extreme數(shù)學(xué)函數(shù)分布,隨鑄件長度增加連續(xù)上升;凝固總尺寸變形量隨著鑄件模數(shù)、凝固枝晶搭接溫度與時(shí)間的增加而連續(xù)上升,隨著凝固冷卻速度與二元共晶反應(yīng)溫度的增加而不斷降低。
[Abstract]:The solidification deformation of hypereutectic Al-7Si-0.6mg alloy was studied by using K-type thermocouple and data analysis software. The results show that with the increase of casting modulus and aspect ratio, the initial crystallization temperature and the binary eutectic reaction temperature increase, the first cooling rate, the second cooling rate and the overall solidification cooling rate decrease continuously. Under the influence of the heat transfer between casting and mold interface, the volume shrinkage of the initial solidification site produces air gap and extends gradually to the center area along the side line. The thermal stress induced by the solidification temperature difference is constrained by the rigidity of the casting mold, and the casting produces flexural deformation. The deformation of solidification dimension in width direction accords with Lorentz mathematical function distribution, and decreases gradually with the decrease of aspect ratio of castings, and the height direction accords with extreme mathematical function distribution, and increases continuously with the increase of casting length, and the total solidification dimension deformation quantity increases with casting modulus. With the increase of solidification dendrite lap temperature and time, the increase of solidification cooling rate and binary eutectic reaction temperature decreased.
【作者單位】： 中國航空工業(yè)集團(tuán)公司北京航空材料研究院;北京市先進(jìn)鋁合金材料及應(yīng)用工程技術(shù)研究中心;
【分類號(hào)】：TG146.21

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本文編號(hào)：2057714