Influence of particle size on powder rheology and effects on mass flow during directed energy deposition additive manufacturing
Influence of particle size on powder rheology and effects on mass flow during directed energy deposition additive manufacturing
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DOI：
10.1016/j.powtec.2021.10.059
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发表时间：
2021-11-10
影响因子：
5.2
通讯作者：
Palmer, T. A.
中科院分区：
文献类型：
--
作者：
Iams, A. D.;Gao, M. Z.;Palmer, T. A.
在定向能量沉积增材制造中使用的金属粉末经受不能通过传统粉末表征捕获的颗粒颗粒和颗粒-气体相互作用。粉末性能的变化，确定通过质量流量测量的精益（UNS S32101），标准（UNS S32205），和超级（UNS S32750）双相不锈钢粉末指定的定向能量沉积在三个商业送粉机。在这些不同的系统中，贫品位始终显示出最低的质量流率。这三种粉末之间的差异仅通过先进的粉末和流变表征工具来确定，这些工具将颗粒特性和流变特性与粉末流动和性能联系起来。在贫品位中向较大尺寸分布的轻微转变产生较高百分比的具有较高质量的较大颗粒，其抵抗运动并增加流动阻力。在流变测试期间，通过较高的内聚强度和流化测量来捕获较高的流动阻力。(c)2021爱思唯尔有限公司版权所有。
Metal powders used in directed energy deposition additive manufacturing are subjected to particle particle and particle-gas interactions not captured through traditional powder characterization. Variations in powder performance were identified through mass flow rate measurements of lean (UNS S32101), standard (UNS S32205), and super (UNS S32750) duplex stainless steel powders specified for directed energy deposition on three commercial powder feeders. Across these different systems, the lean grade consistently displayed the lowest mass flow rates. Differences between the three powders were only identified with advanced powder and rheological characterization tools, which linked particle characteristics and rheological properties to powder flow and performance. A slight shift to a larger size distribution in the lean grade produced a higher percentage of larger particles with higher masses that resisted motion and increased flow resistance. Higher flow resistance was captured through higher cohesion strength and fluidization measurements during rheological testing. (c) 2021 Elsevier B.V. All rights reserved.