高强铝合金电磁-深回热均匀凝固行为

项目名称： 高强铝合金电磁-深回热均匀凝固行为

项目编号： No.51204046

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 冶金与矿业学科

项目作者： 张海涛

作者单位： 东北大学

项目金额： 25万元

中文摘要： 为了解决高强铝合金大尺寸铸锭制备过程成分和组织多尺度不均匀这一重要问题，本项目通过使用电磁-深回热技术，研究不同电磁-深回热工艺下的温度场，获得电磁-深回热工艺下温度场的工艺调控方法；研究不同电磁-深回热工艺下凝固组织均匀性和宏/微观偏析，建立一个耦合相图计算、多物理场、多组元、多尺度和多相耦合数学模型，揭示成分与组织宏/微观均匀性调控规律和机制，突破高强铝合金大尺寸铸锭制备技术的瓶颈，为制备出大飞机工程急需的优质铸锭提供指导；发展电磁-深回热工艺配合短时高温均匀化实现铸锭均匀化方法为铝合金产品生产提供一种低耗能短流程全新的新工艺，有力的推动我国铝加工的发展。

中文关键词： 凝固；半连续铸造；偏析；微观组织；电磁场

英文摘要： The heterogeneous distributions of composition and solidification structure are the critical problems in producing ingots of high strength aluminum alloys. The present project uses the electromagnet-deep backheatingtechnology, the temperature fieldis studied under the various electromagnet-deep backheating processes, the controlling method of temperature field is obtained.The uniformities of solidification structure and macro/micro-segregationsare studied under various electromagnet-deep backheating processes, the coupled mathematic model including the phase diagram calculation, multi-physical fields, multi-components, multi-scale and multi-phases is built, which reveals the controlling rules and mechanism of the uniformities of composition and solidification microstructure, solves the difficulty in producing the large-size ingots of high strength aluminum alloys and provide guidance for the excellent ingots needed urgently by the large aircraft project; the electromagnet-deep backheating combined with short time and high temperature technology is developed for achieving the homogenization, which provides a new process with low energy consumption and short process for producing the ingots of aluminum alloys and promotes powerfully the development of aluminum industry in China.

英文关键词： Solidification；DC casting；Segregation；Microstructure；Electromagnetic field