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
- Resource Type
- article
- Authors
- Liu, Peng; Sun, Si-yu; Xu, Shu-bo; Cao, Mei-qing; Hong, Chang; Hu, Jia-ying
- Source
- Materials Research. January 2018 21(6)
- Subject
- selective laser melting
Ni-based alloys
heat treatment
microstructure
residual stress
- Language
- English
- ISSN
- 1516-1439
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 (NbNi3) were precipitated on the grain boundary since the enrichment 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.