Effect of Solid Solution + Double Ageing on Microstructure and Properties in the Layer by Layer of the Z-Y Interface of Inconel 718 alloys Fabricated by SLM

Peng Liu, Si-yu Sun, Shu-bo Xu, Mei-qing Cao, Chang Hong, Jia-ying Hu
2018 Materials Research  
The microstructure in the Z-Y surface of Inconel 718 alloys fabricated by selective laser melting (SLM) shows the relatively homogeneous and irregular fine grain structure after the heat treatment process of 1050ºC solid solution + double ageing. A large number of bulk precipitates were observed on the grain boundary, and the typical dendritic crystallization and Laves phases disappeared. It is possible that a large number of δ phases (NbNi 3 ) were precipitated on the grain boundary since the
more » ... nrichment effect of element Nb. The hardness in the Z-Y surface increased from 350HV to 500HV, and the residual stress was transformed from the tensile stress to compressive stress.
doi:10.1590/1980-5373-mr-2018-0395 fatcat:qaxnhkdpfbg4bmdibpjvassce4