Exploring grinding and burnishing as surface post-treatment options for electron beam additive manufactured Alloy 718

摘要: Abstract Numerous additive manufacturing (AM) techniques have been developed over the past decade. Features like immense freedom of intricate part design and shorter lead time make AM routes promising for a wide range applications spanning aerospace, marine automobile sectors. Among various metal processes, Electron Beam Additive Manufacturing (EBAM) is being widely explored to realise potential Ni-based superalloys Ti alloys varied high-performance applications. A novel attempt has made in this paper assess surface integrity as-built EBAM nickel-based superalloy 718 (AB) subjected grinding (G), Low Plasticity Burnishing (LPB) their sequential combination. Apart from influence on sub-surface microstructures, effect process variables during above post-treatments residual stress profiles was also investigated. Results revealed that G + LPB results about 0.6 μm lower roughness, 17% improved microhardness compared AB + LPB, higher compressive as LPB processed samples. The - microhardness, found extend 500 μm more when process. G + LPB, which greatly influenced by prior grinding, smoothens thus better finish. Highest hardness, superior finish, reduced porosity were observed samples adopted AB + G + LPB sequence other samples, with step at 40 MPa yielding best results.