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首页> 美国卫生研究院文献>Materials >Hardening of Additive Manufactured 316L Stainless Steel by Using Bimodal Powder Containing Nanoscale Fraction
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Hardening of Additive Manufactured 316L Stainless Steel by Using Bimodal Powder Containing Nanoscale Fraction

机译：通过使用含有纳米级粒子的双子亮粉制造添加剂的加固制造了316L不锈钢

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摘要

The particle size distribution significantly affects the material properties of the additively manufactured parts. In this work, the influence of bimodal powder containing nano- and micro-scale particles on microstructure and materials properties is studied. Moreover, to study the effect of the protective atmosphere, the test samples were additively manufactured from 316L stainless steel powder in argon and nitrogen. The samples fabricated from the bimodal powder demonstrate a finer subgrain structure, regardless of protective atmospheres and an increase in the Vickers microhardness, which is in accordance with the Hall-Petch relation. The porosity analysis revealed the deterioration in the quality of as-built parts due to the poor powder flowability. The surface roughness of fabricated samples was the same regardless of the powder feedstock materials used and protective atmospheres. The results suggest that the improvement of mechanical properties is achieved by adding a nano-dispersed fraction, which dramatically increases the total surface area, thereby contributing to the nitrogen absorption by the material.
机译：粒度分布显着影响加值制造部件的材料特性。在这项工作中，研究了含有纳米和微级颗粒对微结构和材料性质的双峰粉末的影响。此外，为了研究保护气氛的效果，测试样品在氩气和氮中的316L不锈钢粉末加剧地制成。从双峰粉制造的样品展示了更细的粒子结构，无论保护性气氛如何，都是根据霍尔竖起关系的维氏微硬度的增加。孔隙率分析显示由于粉末流动性差，由于粉末流动性差，造成件的质量劣化。无论使用的粉末原料材料和保护气氛相同，制造样品的表面粗糙度相同。结果表明，通过添加纳米分散的馏分来实现机械性能的改善，这显着增加了总表面积，从而有助于材料的氮吸收。

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