摘要
采用显微组织观察、定量金相分析、扫描差热分析、扫描电镜、X射线衍射研究高铁356铝合金在半固态等温处理过程中的组织演变。结果表明：高铁含量356铝合金合适的半固态等温处理工艺为590℃下保温60 min,此时α（Al）晶粒较圆整,晶粒尺寸为89μm,形状因子为0.75,液相比率为40%;半固态等温技术可以使β-Fe富铁相由长针状转变为细小短棒状,这主要是归因于高温下富铁相的溶解及断裂。
The microstructure evolution of 356 aluminum alloy with high iron content during semi-solid isothermal treatment was studied by means of microstructure observation,quantitative metallographic analysis,differential scanning calorimetry,scanning electron microscopy and X-ray diffraction. The results show that the optimal semi-solid isothermal treatment process for the 356 aluminum alloy with high Fe content is thermal insulation at 590 ℃ for 60 min. After that the α（ Al） grain will turn rounded,and have the grain size of 89 μm,shape factor of 0. 75 and the liquid phase fraction of 40%. The semi-solid isothermal treatment can change the Fe-rich β-Fe phase from the long needle-like to the fine short rod-like,mainly attributed to the dissolution and breakage of the iron-rich intermetallics at high temperature.
作者
林波
李浩宇
许锐
张卫文
肖华强
李少波
LIN Bo;LI Hao-yu;XU Rui;ZHANG Wei-wen;XIAO Hua-qiang;LI Shao-bo(School of Mechanical Engineering, GuiZhou University, Guiyang 550025, China;School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2018年第6期55-61,共7页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51704084)
中国博士后基金(2017M623068)
贵州省自然科学基金[黔科合基础(2016)1026]
贵州省教育厅青年科技人才成长项目(黔教合KY字[2017]101)
关键词
半固态等温处理
356铝合金
富铁相
semi-solid isothermal treatment
356 aluminum alloy
iron-rich intermetallic phase
