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首页> 外文期刊>Applied Surface Science >Processing Conditions And Microstructural Features Of Porous 316l Stainless Steel Components By Dmls
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Processing Conditions And Microstructural Features Of Porous 316l Stainless Steel Components By Dmls

机译：Dmls对多孔316l不锈钢零件的加工条件和显微组织特征

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摘要

Direct metal laser sintering (DMLS), due to its flexibility in materials and shapes, would be especially interesting to produce complex shaped porous metallic components. In the present work, processing conditions and microstructural characteristics of direct laser sintered porous 316L stainless steel components were studied. It was found that a partial melting mechanism of powders gave a high feasibility in obtaining porous sintered structures possessing porosities of ～21-～55%. Linear energy density (LED), which was defined by the ratio of laser power to scan speed, was used to tailor the laser sintering mechanism. A moderate LED of ～3400-～6000J/m and a lower scan speed less than 0.06 m/s proved to be feasible. With the favorable sintering mechanism prevailed, lowering laser power or increasing scan speed, scan line spacing, and powder layer thickness generally led to a higher porosity. Metallurgical mechanisms of pore formation during DMLS were addressed. It showed that the presence of pores was through: (ⅰ) the formation of liquid bridges between partially melted particles during laser irradiation; and (ⅱ) the growth of sintering necks during solidification, leaving residual pores between solidified metallic agglomerates.
机译：直接金属激光烧结（DMLS）由于其材料和形状的灵活性，对于生产复杂形状的多孔金属部件将特别有趣。在本工作中，研究了直接激光烧结多孔316L不锈钢部件的加工条件和显微组织特性。研究发现，粉末的部分熔融机理对于获得孔隙率为〜21〜55％的多孔烧结结构具有很高的可行性。由激光功率与扫描速度之比定义的线性能量密度（LED）用于调整激光烧结机理。大约3400-〜6000J / m的中等LED和低于0.06 m / s的较低扫描速度被证明是可行的。借助有利的烧结机制，降低激光功率或提高扫描速度，扫描线间距和粉末层厚度通常会导致更高的孔隙率。研究了DMLS过程中孔形成的冶金机理。结果表明，孔的存在是由于：（ⅰ）在激光照射过程中，部分熔化的颗粒之间形成了液桥； （ⅱ）凝固过程中烧结颈的生长，在凝固的金属团聚物之间留下残留的孔。

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