Influence of powder characteristics and additive manufacturing process parameters on the microstructure and mechanical behaviour of Inconel 625 fabricated by Selective Laser Melting
Influence of powder characteristics and additive manufacturing process parameters on the microstructure and mechanical behaviour of Inconel 625 fabricated by Selective Laser Melting
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DOI：
10.1016/j.addma.2018.09.023
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发表时间：
2018-12-01
影响因子：
11
通讯作者：
Jothi, Sathiskumar
中科院分区：
文献类型：
--
作者：
Pleass, Christopher;Jothi, Sathiskumar
选区激光熔化(SLM)作为一种附加制造工艺，可以直接从计算机辅助设计模型中制造出接近净形状的金属零件，这可能是传统制造方法难以制造的。本文以粉末金属为原料，对选择性激光熔凝(SLM)工艺进行了研究。研究了镍基高温合金的SLM制备工艺、粉末的粒度分布、流动性、力学性能和显微组织。还研究了不同的粉末表征方法，以确定最适用于SLM应用的方法。本研究使用了三种不同的Inconel 625(IN625)粉末原料。首先，利用不同类型的表征技术对三种不同的IN625粉末的化学成分、粒度分布和流动性进行了全面的表征。研究发现，直径小于10微米的大量粉末颗粒的存在会导致严重的团聚，并使SLM加工变得困难。其次，以不同工艺参数的粉末为原料，采用SLM法制备了试件，并对试件的气孔率和力学性能进行了分析。其次，利用扫描电子显微镜(SEM)、电子背散射衍射仪(EBSD)对薄膜的微观结构进行了分析。最后，对金属粉末表征、SLM制造、扫描电子显微镜/EBSD研究和IN625的力学性能所收集的数据进行了数据分析。观察到粉末特性以及SLM工艺参数对制备的IN625的质量有影响。
Selective Laser Melting (SLM) as an additive manufacturing process can fabricate near to net shape metallic components directly from Computer aided design models, which may be difficult to fabricate using conventional manufacturing methods. In this work, the powdered metals used as the raw material feedstock in the Selective Laser Melting (SLM) process were studied. SLM manufacturing processibility of nickel based super alloy, powders related to the particle Size Distribution (PSD), flow ability, mechanical properties and microstructures was investigated. Different powder characterisation methods were also investigated to establish which might be most useful for SLM application. Three different Inconel 625 (IN625) powder feedstock materials have been accounted for this study. Firstly, three different IN625 powders were fully characterised for chemical composition, particle size distribution and flow ability using different types of characterisation techniques. It has been found that the presence of any significant proportion of powder particles smaller than 10-mu m diameter, leads to severe agglomeration and make SLM processing difficult. Secondly, coupons were manufactured using SLM from each powder with different process parameter, which were analysed for porosity and mechanical behaviour. Next, the scanning electron microscopy (SEM), electron back scattering diffraction (EBSD) are employed to investigate the microstructures. Finally, data analysis was employed on the data collected by metal powders characterization, SLM manufacturing, SEM/EBSD study and mechanical properties of the IN625. It has been observed that the powder characteristics, as well as SLM process parameters influences on the quality of the IN625 fabricated.