Improvement of a High Velocity Compaction Technique for Iron Powder  

作　　者：Dil Faraz KHAN Haiqing YIN Zahid USMAN Matiullah KHAN Xianjie YUAN Wenhao WANG Xuanhui QU 

机构地区：[1]Laboratory of Particulate and Powder Metallurgy,School of Materials Science and Engineering,University of Science and Technology Beijing [2]Department of Physics,University of Science and Technology Bannu [3]Research Centre of Materials Science,School of Materials Science and Engineering,Beijing Institute of Technology [4]School of Materials Science and Engineering,University of Science and Technology Beijing

出　　处：《Acta Metallurgica Sinica(English Letters)》2013年第4期399-403,共5页金属学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(NSFC)(No.51172018);the National High Technical Research and Development Programme of China(No.2009BAE74B00);the National Basic Research Program of China(No.2006CB605207);MOE Program for Changjiang Scholars and Innovative Research Team in University of China(No.I2P407)

摘　　要：Water atomized pure iron powder was compacted by high velocity compaction （HVC） with and without upper relaxation assist （URA） device. The influence of URA device on green density, spring back, green strength and hardness was studied. Morphological characteristics of the samples were observed by scanning electron microscope （SEM）. Green strength of the samples was measured by computer controlled universal testing machine. The results show that as stroke length increases, the green density, green strength and hardness of the compacts increase gradually. At the identical stroke length, the green density of the compacts pressed with URA devise was 2% higher than the compacts pressed without URA device. The green strength and hardness of the compacts pressed with URA device were higher than the compacts pressed without URA device. Furthermore, the radial spring back of the compacts decreased gradually with the increment in stroke length, whilst that of compacts prepared with URA device was lower.Water atomized pure iron powder was compacted by high velocity compaction （HVC） with and without upper relaxation assist （URA） device. The influence of URA device on green density, spring back, green strength and hardness was studied. Morphological characteristics of the samples were observed by scanning electron microscope （SEM）. Green strength of the samples was measured by computer controlled universal testing machine. The results show that as stroke length increases, the green density, green strength and hardness of the compacts increase gradually. At the identical stroke length, the green density of the compacts pressed with URA devise was 2% higher than the compacts pressed without URA device. The green strength and hardness of the compacts pressed with URA device were higher than the compacts pressed without URA device. Furthermore, the radial spring back of the compacts decreased gradually with the increment in stroke length, whilst that of compacts prepared with URA device was lower.

关 键 词：High velocity compaction URA device Green density Spring back Green strength HARDNESS 

分 类 号：TF123.21[冶金工程—粉末冶金]