TC4钛合金粉末在SLM工艺中的循环老化行为
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摘要
研究了TC4钛合金粉末颗粒形貌、粒度分布、流动性以及选区激光熔化(SLM)成形试样的孔隙率、显微硬度等在循环利用过程中的变化规律,并对一系列性能改变的机理进行分析。结果表明:随循环次数增加,粉末颗粒形貌整体仍保持球形,表面光滑度提高;循环14次后观察不到卫星颗粒;粒度分布经历了集中-分散-集中的变化;多次循环利用后粉末的流动性显著提高;通过对粉末宏、微观形貌的分析可知,上述性能变化趋势均与粉末中细小粉粒和卫星颗粒逐渐减少有关。成形试样孔隙率随循环利用次数增加先增大后减小;显微硬度不受TC4粉末循环利用次数影响。
This research focused on the variation of TC4 powder’s properties, including particle morphology, particle size distribution(PSD) and flowability during the recycling process, and the underlying mechanism of the variation was proposed in the meantime. Theresults show that the particles still keep the morphology of sphere and become smoother with the increasing recycle times. Few satelliteparticles are observed after recycling 14 times. The PSD experiences the process of concentration-dispersion-concentration. The recycledpowder shows improved flowability. All the variation above is inextricably linked with the decrease in the tiny particles and satelliteparticles in the recycled powder. The porosity of the forming samples increases firstly and then decreases with the increasing recycle times.Recycle times of TC4 powder have no effect on microhardness.
This research focused on the variation of TC4 powder’s properties, including particle morphology, particle size distribution(PSD) and flowability during the recycling process, and the underlying mechanism of the variation was proposed in the meantime. Theresults show that the particles still keep the morphology of sphere and become smoother with the increasing recycle times. Few satelliteparticles are observed after recycling 14 times. The PSD experiences the process of concentration-dispersion-concentration. The recycledpowder shows improved flowability. All the variation above is inextricably linked with the decrease in the tiny particles and satelliteparticles in the recycled powder. The porosity of the forming samples increases firstly and then decreases with the increasing recycle times.Recycle times of TC4 powder have no effect on microhardness.
引文
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[3]Wang J H,Cheng J,Li Y X et al.Lasers in Engineering[J],2012,23(5):395
[4]Ouyang Hongwu(欧阳鸿武),He Shiwen(何世文),Liu Yong(刘咏).Materials Science and Engineering of Powder Metallargy(粉末冶金材料科学与工程)[J],2004,9(2):106
[5]Slotwinski J A,Garboczi E J.The Minerals,Metals&Materials Society[J],2015,67(3):538
[6]ASTM International.ASTM F3049-14[S].2014
[7]Aboulkhair N T,Everitt N M.Additive Manufacturing[J],2014,1(4):77
[8]Yang Qiyun(杨启云),Wu Yudao(吴玉道),Sha Fei(沙菲)et al.China Powder Science and Technology(中国粉体技术)[J],2016,22(3):27
[9]Zhang Anfeng(张安峰),Li Dichen(李涤尘),Liang Shaoduan(梁少端)et al.Aeronautical Manufacturing Technology(航空制造技术)[J],2016,22:16
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[11]Read N,Wang W,Essa K et al.Materials and Design[J],2015,65:417
[12]Sedya V,Kaufmann N,Emmelmann C.Physics Procedia[J],2012,39:425
[13]Ardila L C,Garciandia F,González-Díaz J B et al.Physics Procedia[J],2014,56:99
[14]Tang H P,Qian M,Liu N et al.The Minerals,Metals&Materials Society[J],2015,67(3):555
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[16]ASTM International.ASTM B962-17[S].2017
[17]Gong H J,Rafi K,Gu H F et al.Materials and Design[J],2015,86:545