A thermo – Mechanical modelling approach on the residual stress prediction of SLM processed HPNGV aeroengine part

Abstract

In the present study, selective laser melting (SLM) is used to fabricate the Inconel 718 high-pressure nozzle guide vane (HPNGV), an aero-engine part. Inconel 718 is widely used in aero-engine components due to its inherent characteristics at elevated temperature. The aim of the study is to investigate the residual stresses developed on the HPNGV part with and after removal of the base plate in the SLM process. The residual stresses were determined experimentally using X-ray diffraction technique. The maximum residual stress at location 4 was found around 700 MPa and A thermo-mechanical finite element model (FEM) was developed for SLM processed Inconel HPNGV using ANSYS software. SLM processed HPNGV part exhibited a higher magnitude of residual stresses after base plate removal. It is found that there is an increase of residual stress (about 16%) at location 4 and an increase of residual stress (about 27%) at location 2 after removal of base plate from the component. The experimental results of the samples were comparable with FEM simulation results.