Thermo-mechanical improvement of Inconel 718 using ex situ boron nitride-reinforced composites processed by laser powder bed fusion.

ABSTRACT: Hexagonal boron nitride-reinforced Inconel 718 (h-BN/IN718) composites were fabricated using a laser powder bed fusion (LPBF) technique to treat a nanosheet-micropowder precursor mixture prepared in a mechanical blending process. Tailoring the BN in IN718 enhanced the thermal resistance of the composites, thereby dampening the sharpness of the melting temperature peak at 1364 °C. This is because the presence of the BN reinforcement, which has a low coefficient of thermal expansion (CTE), resulted in a heat-blocking effect within the matrix. Following this lead, we found that the BN (2.29 g/cm³) was uniformly distributed and strongly embedded in the IN718 (8.12 g/cm³), with the lowest alloy density value (7.03 g/cm³) being obtained after the addition of 12 v

SUBMITTER: Kim SH 

PROVIDER: S-EPMC5662723 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature