Microstructure and mechanical properties of Inconel 625/nano-TiB2 composite fabricated by LAAM

Laser aided additive manufacturing (LAAM) was applied to produce nano-TiB2 particle reinforced Inconel 625 composite material. The influence of nano-TiB2 addition on the microstructure, micro-hardness, wear performance and mechanical properties of the composite was studied. The XRD and SEM analyses verified that the LAAM processed Inconel 625/nano-TiB2 composite consisted of single long columnar grain along building direction with TiB2 particles concentration at grain boundaries. The mechanical testing revealed that the LAAM processed Inconel 625/nano-TiB2 composite possessed excellent tensile properties (sigma(UTS) approximate to 1020 MPa, sigma(0.2YS) approximate to 714 MPa, delta approximate to 19%) with relatively high micro-hardness (HV0.2 = 347) and good abrasive resistance (COF approximate to 0.39). (C) 2016 Elsevier Ltd. All rights reserved.