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超聲場作用下Mg-3Ca合金除氣及細化的工藝研究
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國家“十二五”科技支撐計劃項目(2011BAE22B03,2011BAE22B04);國家自然科學(xué)基金資助項目 (51004032,51074237,50904018,50974037,51074207);中央高?;究蒲袠I(yè)務(wù)費專項資金資助 (N090409002,N090209002);東北大學(xué)博士研究生科研創(chuàng)新項目(N100609002);中國博士后科學(xué)基金資助項目 (20100471468);高校學(xué)校博士學(xué)科專項科研基金(200801450010)


Study on Degassing and Refining Technology of Mg-3Ca Alloy under Ultrasonic Field
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    摘要:

    對Mg-3Ca合金熔體進行超聲處理來研究超聲功率、施振時間和施振溫度對合金除氣及凝固組織的影響。結(jié)果表明,采用超聲波處理技術(shù),可以有效去除Mg-3Ca合金熔體中的氣體,從而提高鑄錠的致密度。超聲除氣效果與施振功率、處理時間及處理溫度密切相關(guān)。當(dāng)施振功率過小、處理時間過短或過長及處理溫度過高或過低均不會有良好的除氣效果。熔體處理溫度為:700 ℃,超聲功率為150 W,處理時間為120 s時除氣效果最好,除氣率可達53.8%。另外,超聲波在去除熔體中氣體的同時,也使得鑄錠的凝固組織變得細小、均勻。粗大的樹枝晶不利于氣泡的上浮和熔體補縮;而均勻、細小的等軸晶則有利于這一點。

    Abstract:

    The effects of ultrasonic power, duration and treatment temperature on molten Mg-3Ca alloy degassing and solidification structure were investigated. The results indicate that applying of ultrasonic treatment technology can effectively remove gas and increase the density of Mg-3Ca alloy. Ultrasonic degassing effect is closely related with ultrasonic power, duration and treatment temperature. Too low ultrasonic power, too short or too long ultrasonic duration and too high or too low temperature are not beneficial to degassing effect. Under this experiment condition, when ultrasonic power is 150 W, ultrasonic duration is 120 s and treatment temperature is 700 ℃, the optimum degassing effect can be obtained and the degassing efficiency reaches 53.8%. In addition, ultrasound not only removes gas in melt, but also obtains the uniform refining solidification structure of ingot at the same time. Coarsened dendrite is adverse to bubbles rising and melt feeding. However, uniform refining equiaxed grain is beneficial to bubbles rising and melts feeding.

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賈 征,樂啟熾,張志強,崔建忠,李 飛.超聲場作用下Mg-3Ca合金除氣及細化的工藝研究[J].稀有金屬材料與工程,2012,41(5):914~919.[Jia Zheng, Le Qichi, Zhang Zhiqiang, Cui Jianzhong, Li Fei. Study on Degassing and Refining Technology of Mg-3Ca Alloy under Ultrasonic Field[J]. Rare Metal Materials and Engineering,2012,41(5):914~919.]
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  • 收稿日期:2011-07-08
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