Microstructures and mechanical behavior of Inconel 718 fabricated by selective laser melting
Microstructures and mechanical behavior of Inconel 718 fabricated by selective laser melting
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DOI：
10.1016/j.actamat.2011.12.032
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发表时间：
2012-03-01
期刊：
影响因子：
9.4
通讯作者：
Medina, F.
中科院分区：
文献类型：
--
作者：
Amato, K. N.;Gaytan, S. M.;Medina, F.
在这项研究中，Inconel 718圆柱体是通过选择性激光熔化在氩气或氮气从预合金粉末。定向在构建方向（z轴）和垂直于构建方向（x轴）的制造圆柱体表现出柱状晶粒和γ“（体心四面体）Ni 3 Nb扁椭圆形沉淀物阵列，通过组合光学金相学、透射电子显微镜和X射线衍射分析确定其定向在强[200]织构中。制造和热等静压（HIP）组件表现出更明显的[200]柱状γ“"相沉淀物结构平行于激光束或构建方向（间隔约0.8 μ m），和部分再结晶的面心立方晶粒结构。制造和退火（1160 ℃，4小时）的部件类似于50%再结晶，并且再结晶区域包含分布在细γ "沉淀物的密集区域中的球状γ“沉淀物。观察到γ "沉淀物总是与γ-fcc NiCr基体的{100}面一致。在退火态样品中，未再结晶/再结晶界面和再结晶晶界处也观察到一些δ相析出物。显微压痕（维氏）硬度为3.9 GPa的制造材料，5.7 GPa的HIP材料，和4.6 GPa的退火材料。相应的拉伸性能与锻造Inconel 718合金相当。由Elsevier Ltd.代表Acta Materialia Inc.出版。
In this study Inconel 718 cylinders were fabricated by selective laser melting in either argon or nitrogen gas from a pre-alloyed powder. As-fabricated cylinders oriented in the build direction (z-axis) and perpendicular to the build direction (x-axis) exhibited columnar grains and arrays of gamma '' (body-centered tetragonal) Ni3Nb oblate ellipsoidal precipitates oriented in a strong [200] texture determined by combined optical metallography, transmission electron microscopy, and X-ray diffraction analysis. Fabricated and hot isostatic pressed (HIP) components exhibited a more pronounced [200] columnar gamma '' phase precipitate architecture parallel to the laser beam or build direction (spaced at similar to 0.8 mu m), and a partially recrystallized fcc grain structure. Fabricated and annealed (1160 degrees C for 4 h) components were similar to 50% recrystallized and the recrystallized regions contained spheroidal gamma' precipitates distributed in a dense field of fine gamma '' precipitates. The gamma '' precipitates were always observed to be coincident with {100} planes of the gamma-fcc NiCr matrix. Some delta phase precipitates in the unrecrystallized/recrystallized interfaces and recrystallized grain boundaries were also observed in the annealed samples. The microindentation (Vickers) hardness was 3.9 GPa for the as-fabricated materials, 5.7 GPa for the HIP material, and 4.6 GPa for the annealed material. Corresponding tensile properties were comparable with wrought Inconel 718 alloy. Published by Elsevier Ltd. on behalf of Acta Materialia Inc.