金属学报  2006, Vol. 42 Issue (11): 1130-1136

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B、Sr联合处理Al-7Si合金及细化变质效果评估

陈 祥 耿慧远 李言祥

清华大学机械工程系; 先进成形制造教育部重点实验室; 北京100084

Combined Treatment of Sr and B and Evaluation of Refinment--Modification

CHEN Xiang; GENG Huiyuan; LI Yanxiang

Key Laboratory for Advanced Materials Processing Technology; Ministry of Education; Department of Mechanical Engineering; Tsinghua University; Beijing 100084

陈祥; 耿慧远; 李言祥 . B、Sr联合处理Al-7Si合金及细化变质效果评估[J]. 金属学报, 2006, 42(11): 1130-1136 .
, , . Combined Treatment of Sr and B and Evaluation of Refinment--Modification[J]. Acta Metall Sin, 2006, 42(11): 1130-1136 .

摘要 参考文献 相关文章 Metrics 全文: PDF(1228 KB)   摘要: 采用定量金相、化学分析的方法研究了B、Sr联合处理对亚共晶铝硅合金凝固组织的影响。研究结果表明，亚共晶铝硅合金熔体经B、Sr联合处理时，Sr对熔体的细化处理效果无明显影响，而B的出现减少了熔体中有效Sr含量，降低了熔体的变质处理效果。在此基础上，结合冷却曲线模式识别技术研究了亚共晶铝硅合金熔体状态与冷却曲线凝固段整体形状的关系。随着表征曲线相似程度的综合偏差值Ω趋近于0，相应的变质级别差值及晶粒尺寸差值也同时向0收敛。冷却曲线凝固段的整体形状可以表征亚共晶铝硅合金B、Sr联合处理后的熔体状态。通过建立基于大量实验结果累积的数据库，实现了B、Sr联合处理Al-7Si合金熔体细化变质效果的在线评测。 关键词 ： Al-Si合金,  细化,  变质,  冷却曲线模式识别     Abstract：The effects of boron and strontium on the solidified structures of hypoeutectic Al-Si alloys by combination addition of boron and strontium have been studied by quantitative metallography and chemical analysis. The results show that the presence of strontium has no remarkable effects on the efficiency of grain refinement of Al-7Si alloys. But the presence of boron reduces the effective strontium level in the melt Al-7Si alloys and thus decreases the modification level of Al-7Si alloys. Based on these, the relationship between the shape of solidification segment of the cooling curve and the features of melt hypoeutectic Al-Si alloys has been studied by computer-aided cooling curve analysis and pattern cooling curve recognition approaches. It is indicated that both the grain size difference and the modification level difference converge to zero when the comprehensive parameter Ω, which expresses the difference between cooling curves, approaches to zero. The shape of the solidification segment of a cooling curve can token the features of the Al-7Si alloy melt by combination addition of boron and strontium. Based on a database established from a large amount of experimental results, the on-line prediction of eutectic modification level of Al-7Si alloy melt has been realized. Key words： aluminum-silicon alloys    grain refinement    modification    cooling curve recognition 收稿日期: 2006-03-14      ZTFLH:  TN911.73   服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 陈祥 耿慧远 李言祥 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y2006/V42/I11/1130 [1] Croseley E, Mondolfo L F. AFS Trans, 1966; 74: 53 [2] Argyropoulos S, Closset B, Oger H. AFS Trans, 1983; 27: 351 [3] Paray F, Gruzleski J E. AFS Trans, 1994; 115: 833 [4] Apelian D, Sigworth G K, Wharler K R. AFS Trans, 1984; 92: 297 [5] Kori S A, Murty B S, Chakraborty M. Mater Sci Eng, 2000; A283: 94 [6] Kurfman V B. AFS Trans, 1961; 69: 234 [7] Charbonnier J. Hommes Foerie, 1975; 59: 29 [8] Ananthanarayanan L, Samuel F H, Gruzleski J E. AFS Trans, 1992; 113: 383 [9] Easton M, Stjohn D. Metall Mater Trans, 1999; 30A: 1613 [10] Charbonnier J. AFS Trans, 1984; 92: 907 [11] Bekaert F, Ghent E W. Aluminum, 1996; 72: 442 [12] Gong L Q. 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