Rapid fabrication of bulk-form TiB2/316L stainless steel nanocomposites with novel reinforcement architecture and improved performance by selective laser melting
Rapid fabrication of bulk-form TiB2/316L stainless steel nanocomposites with novel reinforcement architecture and improved performance by selective laser melting
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DOI：
10.1016/j.jallcom.2016.04.156
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发表时间：
2016-09-25
影响因子：
6.2
通讯作者：
Yang, Jenn-Ming
中科院分区：
文献类型：
--
作者：
AlMangour, Bandar;Grzesiak, Dariusz;Yang, Jenn-Ming
选择性激光熔化 (SLM) 是一种新型增材制造技术，用于制造具有不同纳米级 TiB2 含量 (vol.%) 的纳米结构 TiB2/316L 不锈钢纳米复合材料。 SLM 处理的纳米复合材料的微观结构通过 SEM、EBSD 和 TEM 进行表征，而机械性能则通过显微硬度、压缩测试和磨损测试进行表征。研究发现，SLM 加工的纳米复合材料的微观结构和机械性能对 TiB2 含量敏感。最佳 TiB2 含量确定为 10 vol.%。此外，TiB2颗粒均匀分散，并沿晶界形成纳米级环状结构。与SLM处理的未增强316L不锈钢样品相比，TiB2/316L纳米复合材料表现出更高的显微硬度和屈服强度，同时表现出较低的摩擦系数和磨损率；这是由于晶粒细化和晶界强化的综合影响。纳米复合材料在微压缩测试中表现出压缩屈服强度和延展性的良好组合。 (C) 2016 Elsevier B.V. 保留所有权利。
Selective laser melting (SLM), a novel additive manufacturing technology, was employed to fabricate nanostructured TiB2/316L stainless steel nanocomposites with varying nanoscale TiB2 content (vol.%). The resulting microstructure of the SLM-processed nanocomposites was characterized by SEM, EBSD, and TEM, while the mechanical properties were characterized using microhardness, compression tests, and wear tests. It was found that the microstructure and mechanical properties of the SLM-processed nanocomposites were sensitive to the TiB2 content. The optimal TiB2 content was determined to be 10 vol.%. Further, the TiB2 particles were homogeneously dispersed and they formed nanoscale ring-like structures along the grain boundaries. In contrast to the SLM-processed unreinforced 316L stainless steel sample, the TiB2/316L nanocomposites exhibited higher microhardnesses and yield strengths while showing low coefficients of friction and wear rates; this was owing to the combined effects of grain refinement and grain-boundary strengthening. The nanocomposites showed good combination of compression yield strength and ductility during microcompression tests. (C) 2016 Elsevier B.V. All rights reserved.