摘要
在NaCl-KCl基净化熔剂中分别添加10%NaF、10%NaF+2%Na2SO4+4%Na2CO3、3%NaF+2%Na2SO4+4%Na2CO3+7%Na3AlF6(均为质量分数)制备得到3种排杂熔剂(熔剂Ⅰ、熔剂Ⅱ、熔剂Ⅲ),并对A356铝合金熔体进行净化处理,研究了不同熔剂的净化效果及净化后合金的显微组织和拉伸性能。结果表明:3种排杂熔剂均提高了铝合金的冶金质量,净化处理后的组织中夹杂物含量减少、尺寸减小,铝液中的氢含量降低,合金的抗拉强度和伸长率提高;熔剂Ⅲ的净化效果最佳,且最佳添加量(质量分数)为2%,净化处理后的基体组织均为等轴晶,主要断裂模式为穿晶微孔(韧窝)聚集型韧性断裂。
Three inclusion removal fluxes(FluxⅠ,FluxⅡ,FluxⅢ)were prepared by adding 10 wt%NaF,10 wt%NaF+2 wt%Na2SO4+4 wt%Na2CO3,3 wt%NaF+2 wt%Na2SO4+4 wt%Na2CO3+7 wt%Na3AlF6 into NaCl-KCl based purification flux,respectively,and then were used to purify A356 aluminum alloy melt.The purification effect of different fluxes and the microstructure and tensile properties of the alloy after purification were studied.The results show that all the three inclusion removal fluxes improved the metallurgical quality of the aluminum alloy.The content and size of inclusions in the microstructure after purification were reduced,the hydrogen content in the liquid aluminum decreased,and the tensile strength and elongation of the alloy increased.The purification effect of the fluxⅢ was the best,and the optimal addition amount was 2 wt%;the purified matrix structure consisted of equiaxed grains,and the main fracture mode was transgranular micropore(dimples)aggregate ductile fracture.
作者
宋莉莉
傅高升
陈鸿玲
王火生
林朝升
傅高升(导师)
SONG Lili;FU Gaosheng;CHEN Hongling;WANG Huosheng;LIN Chaosheng(School of Materials Science and Engineering,Fuzhou University,Fuzhou 350000,China;Ningde Vocational and Technical College,Fuan 355000,China;School of Materials Science and Engineering,Fujian University of Technology,Fuzhou 350000,China;Shenzhen Yansheng Technology Co.,Ltd.,Shenzhen 518109,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2019年第12期24-28,33,共6页
Materials For Mechanical Engineering
基金
福建省教育厅中青年教师教育科研项目(JA15868)
福建省高校杰出青年科研人才培育计划资助项目(02330021703)
关键词
A356铝合金
排杂熔剂
熔体净化
显微组织
拉伸性能
A356aluminum alloy
inclusion removal flux
melt purification
microstructure
tensile property
