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王文强,敖波,邬冠华,梁毅.增材制造GH3625粉末三维成像与空心粉分析[J].稀有金属材料与工程(英文),2020,49(6):2024~2028.[Wenqiang Wang,Bo Ao,Guanhua Wu and Yi Liang.Three-dimensional imaging and hollow powder analysis of GH3625 powder for additive manufacturing[J].Rare Metal Materials and Engineering,2020,49(6):2024~2028.]
Three-dimensional imaging and hollow powder analysis of GH3625 powder for additive manufacturing
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Received:May 13, 2019  Revised:June 20, 2019
DOI:
Key words: Additive manufacturing  Micro computed tomography  Particle size  Hollow powder
Foundation item:无损检测技术教育部重点实验室开放基金(EW201708253)
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Wenqiang Wang,Bo Ao,Guanhua Wu and Yi Liang  
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Abstract:
      The research object were additive manufacturing GH3625 metal powders,the two-dimensional microstructure of the powders were observed by scanning electron microscopy(SEM), the three-dimensional structure of the powders were characterized by micro-CT,and the geometric parameters such as particle size, volume and sphericity of the powders were quantitatively analyzed. All the pores inside the hollow powders were successfully extracted by three-dimensional(3D) segmentation, and the 3D printed powder quality was characterized by volume porosity, probability of hollow powder, sphericity and other parameters.Finally, the influence of the pore diameter in the hollow powder on the sphericity of powders were investigated. The experimental results show that micro-CT is an ideal tool to characterize the quality of metal powders of additive manufacturing, a total of 20576 GH3625 powder particles were detected by CT, the average particle diameter of the powder is 28.16 μm, the number of hollow powder particles is 1440,the number of internal pores is 1515, and a few powder particles have multiple pores,it is found that the sphericity of the hollow powder particles decreases with the increase of the internal pore diameter of the hollow powders.