期刊
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
卷 45, 期 9-10, 页码 851-858出版社
SPRINGER LONDON LTD
DOI: 10.1007/s00170-009-2037-4
关键词
Hot tearing; Al-1% Sn alloy; Grain refinement; Residual elements
资金
- Indian Institute of Technology, Kharagpur, India
In the present work, some investigations have been carried out on hot tears in the Al-1 wt.% Sn alloy, with the objective of preventing hot tearing in aluminum castings. Al-1Sn alloy is extremely prone to hot tearing due to its long freezing range and is an ideal model for studying hot tearing. Experiments were conducted with varying grain refiner (Al-5Ti-1B) percent and pouring temperature. Grain refiner was added to the melt up to 3.0% by weight, which is the conventional limit for grain refiner addition. However, it was found that the maximum addition of grain refiner could not prevent hot tearing, which contradicts the conclusions of some earlier researchers. A mathematical model developed from the experimental data (using regression analysis) has indicated that, among all the constituents present in the Al-1Sn alloy, tin highly increases hot tearing tendency, whereas titanium in the grain refiner decreases hot tearing tendency. The model has also indicated that iron, which is the common impurity in commercial aluminum, reduces hot tearing. Based on the aforesaid model, further experiments were conducted with the addition of iron, which has resulted in complete elimination of hot tearing. Microstructural analysis was carried out using a scanning electron microscope (SEM). The leaf-like structure containing the Al-Sn-Fe-rich phase held the adjacent grains together and thus prevented hot tearing.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据