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| GH4169合金真空自耗重熔铸锭显微疏松的形成规律及熔速影响 | |
| 引用本文： | 刘艳梅,陈国胜,王庆增,孙文儒,刘军和,娄建新,胡壮麒. GH4169合金真空自耗重熔铸锭显微疏松的形成规律及熔速影响[J]. 航空材料学报, 2011, 31(4). DOI: 10.3969/j.issn.1005-5053.2011.4.004 |
| 作者姓名： | 刘艳梅 陈国胜 王庆增 孙文儒 刘军和 娄建新 胡壮麒 |
| 作者单位： | 1. 中国科学院金属研究所,沈阳,110016 2. 宝山钢铁股份公司特殊钢分公司,上海,201900 3. 空军驻沈阳发动机制造公司军代表室,沈阳,110043 |
| 摘 要： | 利用金相显微镜和扫描电镜研究了熔速对GH4169合金真空自耗重熔铸锭显微疏松和金相组织的影响;采用金相图像分析软件定量分析了熔速对铸锭显微疏松数量的影响。GH4169合金真空自耗重熔铸锭显微疏松的形成规律以及熔速影响的研究结果表明,由于金属气体凝结和喷溅等原因的影响,真空自耗铸锭表面激冷层中存在大量边界粗糙曲折的显微疏松。在激冷层下方的铸锭边部组织中,显微疏松数量明显减少,边界圆滑,气泡是疏松形成的重要原因。铸锭心部显微疏松尺寸增大,倾向于沿枝晶间通道分布。铸锭心部位于糊状区的底部,由于熔池较深,凝固速率缓慢,使该处二次和三次枝晶比较发达,偏析严重,从而容易阻塞补缩通道,所以易形成沿枝晶间通道分布的大尺寸疏松。随熔化速率增大,枝晶倾向于水平生长,熔池加深,二次和三次枝晶更加发达,偏析更加严重,显微疏松的尺寸和数量显著增加。 |
| 关 键 词： | GH4169合金 显微疏松 熔速 枝晶 |
Formation Law of Microporosity in GH4169 Alloy Vacuum Arc Remelting Ingot and Influence of Melting Rate |
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| LIU Yan-mei,CHEN Guo-sheng,WANG Qing-zeng,SUN Wen-ru,LIU Jun-he,LOU Jian-xin,HU Zhuang-qi. Formation Law of Microporosity in GH4169 Alloy Vacuum Arc Remelting Ingot and Influence of Melting Rate[J]. Journal of Aeronautical Materials, 2011, 31(4). DOI: 10.3969/j.issn.1005-5053.2011.4.004 | |
| Authors: | LIU Yan-mei CHEN Guo-sheng WANG Qing-zeng SUN Wen-ru LIU Jun-he LOU Jian-xin HU Zhuang-qi |
| Affiliation: | LIU Yan-mei1,CHEN Guo-sheng2,WANG Qing-zeng2,SUN Wen-ru1,LIU Jun-he3,LOU Jian-xin1,HU Zhuang-qi1(1.Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China,2.Special Steel Branch,Baoshan Iron & Steel Co.,Ltd,Shanghai 201900,3.Air Force Representative Office in Shenyang Engines Corporation,Shenyang 110043,China) |
| Abstract: | The effects of melting rate on the microstructure and microporosity formation of GH4169 alloy VAR(vacuum arc remelting) ingots have been studied by using metallographic microscope and scanning electron microscope,and its effects on the area percent of microporosity of the ingots was also analyzed quantitatively by the metallographic image analysis software.The results show that the microporosity formed in the chilled layer at the surface of the ingot possesses a harsh surface due to the existing of metal pa... |
| Keywords: | GH4169 alloy microporosity melting rate dendrite |
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