东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2015, Vol. 36 ›› Issue (5): 646-650.DOI: 10.12068/j.issn.1005-3026.2015.05.009

• 材料与冶金 • 上一篇    下一篇

铝合金凝固收缩行为研究

乐启炽， 李浩宇， 柏媛媛， 张海涛   

  1. (东北大学 材料电磁过程研究教育部重点实验室， 辽宁 沈阳110819)
  • 收稿日期:2014-04-04 修回日期:2014-04-04 出版日期:2015-05-15 发布日期:2014-11-07
  • 通讯作者: 乐启炽
  • 作者简介:乐启炽(1968-)，男，福建大田人，东北大学教授，博士生导师.
  • 基金资助:
    国家重点基础研究发展计划项目(2013CB632203).

Study on Solidification Contraction of Aluminum Alloys

LE Qi-chi， LI Hao-yu， BAI Yuan-yuan， ZHANG Hai-tao   

  1. Key Laboratory of Electromagnetic Processing of Materials， Ministry of Education， Northeastern University， Shenyang 110819，China.
  • Received:2014-04-04 Revised:2014-04-04 Online:2015-05-15 Published:2014-11-07
  • Contact: LE Qi-chi
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摘要： 通过自行设计的实验装置研究合金在自由收缩和受阻收缩过程中的凝固特征，研究了5083，6061和7075三种典型铝合金的凝固收缩行为，预测其铸造过程中的热裂倾向性，引入衡量合金热裂倾向性大小的评价指标应力累积系数(k).结果表明，本实验装置能够准确记录铝合金凝固过程中温度、收缩位移和收缩应力的细微变化；结合热力学软件JMatPro的计算结果，提出铝合金凝固过程中4个阶段的特征；实验预测得出3种实验合金的热裂倾向性大小为:k(5083)＞k(7075)＞k(6061)，与实际铸造过程及CSC预测的结果相符合.研究结果表明该实验装置及数据分析方法具有可行性，利用k值可以准确预测铝合金的热裂倾向性.

关键词: 凝固收缩, 热裂倾向性, 应力累积系数, 凝固特征, 铝合金

Abstract: An equipment was developed to study the solidification characteristics during free and blocked contraction. The solidification contraction behaviors of 5083， 6061 and 7075 aluminum alloys were investigated to predict the hot cracking tendency， and the stress accumulating coefficient (k) was introduced to evaluate the hot cracking tendency. The results indicated that the equipment can record the subtle changes of temperature， thermal shrinkage displacement and shrinkage stress during solidification. Combined with the calculation of thermal software JMatPro， four solidification stages are proposed. The sequence of hot cracking tendency of three investigated alloys is k(5083)＞k(7075)＞k(6061)， which coincides with the result during reality casting and the result of CSC. All the results indicate that the developed equipment and the data analysis method are available， and k can be used to predict accurately the hot cracking tendency of aluminum alloys.

Key words: solidification contraction, hot cracking tendency, stress accumulating coefficient, soliclification characteristic, aluminum alloys

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