In the present work, the effect of the addition of elemental boron in Ti-6Al-4V alloy powder for in-situ fabrication of TiB/Ti-6Al-4V nanocomposites using laser powder bed fusion (L-PBF) technique with commercial processing parameter of EOSINT 280 machine was studied. The microstructural evolution with varying boron addition was examined using an optical microscope (OM), field emission scanning electron microscope (FESEM), and electron backscatter diffraction (EBSD). The added boron (0.1–1.5 wt%) reacted completely with Ti to form needle-like nano/micro TiB particles and induced grain refinement in the microstructure. The L-PBF fabricated TiB/Ti-6Al-4V composites with 0.5 wt% B and above altered the microstructure drastically from martensitic lath to equiaxed α. The microhardness and wear properties of the nanocomposite improved significantly with the increased concentration of boron. Nearly four-fold improvement in wear performance was associated with grain refinement and the formation of nano-sized TiB precipitates.

在目前的工作中，使用具有商业加工参数的激光粉末床熔合（L-PBF）技术在Ti-6Al-4V合金粉末中添加元素硼以原位制造TiB / Ti-6Al-4V纳米复合材料的效果研究了EOSINT 280机器的结构。使用光学显微镜（OM），场发射扫描电子显微镜（FESEM）和电子背散射衍射（EBSD）检查了硼添加量不同时的微观结构演变。所添加的硼（0.1–1.5 wt％）与Ti完全反应，形成针状纳米/微TiB颗粒，并在微观结构中引起晶粒细化。L-PBF制成的TiB / Ti-6Al-4V复合材料的B含量为0.5％（含）以上，使组织从马氏体板条转变为等轴α。随着硼浓度的增加，纳米复合材料的显微硬度和磨损性能显着提高。耐磨性能的近四倍提高与晶粒细化和纳米级TiB沉淀物的形成有关。