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首页> 外文期刊>Journal of Materials Engineering and Performance >Fabrication and Characterization of Core-Shell Density-Graded 316L Stainless Steel Porous Structure
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Fabrication and Characterization of Core-Shell Density-Graded 316L Stainless Steel Porous Structure

机译：核心壳密度分级316L不锈钢多孔结构的制造与表征

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摘要

In the present work, cylindrical shape 316 L cellular structure with different densities in its core and outer layer (shell) is fabricated by using carbamide as a space holder, via powder metallurgy route and layer-by-layer technique. The arrangement of the created pore is the same as face-centered cubic atomic structure, and different densities are created in two regions by using carbamide particles having two different sizes in the range of 1.7-2 and 2-2.4mm. The effect of creating a structure with higher porosity (64.5%) in the core and lower porosity (53.8%) in the shell and vice versa and also change in the ratio of the core to the cylinder cross-sectional areas, on the mechanical properties and compaction load bearing of the fabricated foam samples were investigated. In leaching process of the carbamide particles, as an important step of porous structure's fabrication, it is shown that discontinuous leaching process is more favorable than continuous, by which it would be possible to remove more carbamide particles (around 20%) at the same time. Furthermore, the deformation of the density-graded foam shows the parallel mechanism in the core and shell sections, and the contribution of each part depends on its density and thickness. The energy absorption behavior of the fabricated specimens is evaluated optimally in terms of the energy absorption value associated with the ideal adsorption behavior. The maximum ideal energy absorption efficiency for the samples with more porosity in the shell was approximately equal to 0.91, while for the sample includes the lower amount of porosity in the shell, this value was in the range of 0.85 and 0.89.
机译：在本作工作中，通过使用粉末冶金途径和逐层技术，通过使用碳化物和外层（壳）制造具有不同密度的圆柱形状316 L细胞结构，通过粉末冶金路线和逐层技术来制造。所产生的孔的布置与面为中心的立方体结构相同，并且通过使用氨基磺化物颗粒在1.7-2和2-2.4mm的范围内使用两种不同尺寸的氨基磺化物颗粒在两个区域中产生不同的密度。在壳体中产生具有较高孔隙率（64.5％）的结构（64.5％）的效果，反之亦然，反之亦然，并在机械性能下变为芯与气缸横截面积的比率。研究了制造的泡沫样品的压实负载轴承。在氨基胺颗粒的浸出过程中，作为多孔结构的制造的重要步骤，示出了比连续的不连续浸出过程更有利，通过这样可以同时去除更多的氨基胺颗粒（约20％） 。此外，密度分级泡沫的变形示出了芯和壳部分中的并联机构，并且每个部分的贡献取决于其密度和厚度。根据与理想吸附行为相关的能量吸收值，最佳地评估制造标本的能量吸收行为。壳体中具有更多孔隙率的样品的最大理想能量吸收效率近似等于0.91，而样品包括壳体中的孔隙率较低，该值在0.85和0.89的范围内。

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