Purification of NaCl-KCl Based Inclusion Removal Flux on A356 Aluminum Alloy Melt and Structure and Properties after Purification
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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。Abstract: Three inclusion removal fluxes (Flux Ⅰ, Flux Ⅱ, Flux Ⅲ) were prepared by adding 10wt%NaF, 10wt%NaF+2wt%Na2SO4+4wt%Na2CO3, 3wt%NaF+2wt%Na2SO4+4wt%Na2CO3+7wt%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 flux Ⅲ was the best, and the optimal addition amount was 2wt%; the purified matrix structure consisted of equiaxed grains, and the main fracture mode was transgranular micropore (dimples) aggregate ductile fracture.
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Keywords:
- A356 aluminum alloy /
- inclusion removal flux /
- melt purification /
- microstructure /
- tensile property
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