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工藝參數(shù)對冷坩堝定向凝固鈦合金宏觀組織的影響
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TF19 TF748.423

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自然科學(xué)基金重大項目（50395102）


Effect of Technological Parameters on Macrostructure of Titanium Alloys by Directional Solidification Using Cold Crucible
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    摘要:

    用電磁冷坩堝進(jìn)行定向凝固可以將電磁冷坩堝和定向凝固技術(shù)的優(yōu)點相結(jié)合，為難熔、活潑金屬的定向凝固開辟新的方法，但工藝過程復(fù)雜，影響因素眾多，為了解冷坩堝定向凝固過程和宏觀組織演變規(guī)律，本實驗通過正交實驗得到了工藝參數(shù)對宏觀組織的影響規(guī)律，研究發(fā)現(xiàn)抽拉速度是影響宏觀組織最主要的因素，其他因素影響不顯著，隨抽拉速度降低，晶粒數(shù)量明顯減少，當(dāng)抽拉速度為1mm／min時，能獲得定向凝固組織。理論分析表明，工藝參數(shù)通過影響駝峰和凝固界面的位置和形狀，以及吸收和導(dǎo)出的熱量而影響宏觀組織。

    Abstract:

    Electromagnetic cold crucible directional solidification technology combines the advantages of electromagnetic cold crucible technology and directional solidification technology, and can provide a new effective way for directional solidification of refractory and active metals. But the process is complicated and has many influencing factors. The effects of technological parameters on the macrostructure are studied by orthogonal experiment in order to know about the process of cold crucible directional solidification and the evolution rule of macrostructure. The results show that the withdrawal velocity is the most important one in all factors affecting the macrostructure. The grain numbers are decreased with decreasing the withdrawal velocity, and the directional solidified macrostructure can be obtained with a velocity of 1 mm/min. Theoretical analysis shows that the effects of technological parameters on macrostructure are by changing the shape and position of the solidificational interface and front, and the heats of absorption and loss.

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丁宏升 陳瑞潤 畢維生 郭景杰 劉林 傅恒志.工藝參數(shù)對冷坩堝定向凝固鈦合金宏觀組織的影響[J].稀有金屬材料與工程,2007,36(7):1241~1244.[Ding Hongsheng, Chert Ruirun, Bi Weisheng, Guo Jingjie, Liu Lin, Fu Hengzhi. Effect of Technological Parameters on Macrostructure of Titanium Alloys by Directional Solidification Using Cold Crucible[J]. Rare Metal Materials and Engineering,2007,36(7):1241~1244.]
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