Role of HIPing and Heat Treatment on Properties of Alloy 718 Fabricated by Electron Beam Melting
Paper in proceedings, 2019

Although additive manufacturing (AM) of difficult-to-machine materials can open new design possibilities for production of parts with complex geometries, AM builds are characterized by presence of detrimental defects like shrinkage/ gas porosity and lack-of-fusion. Microstructural inhomogeneity, anisotropy in properties and formation of undesirable phases are added concerns. Motivated by the need for investigation of appropriate thermal post-treatments to eliminate defects, and to achieve desired microstructural and mechanical properties, the influence of hot isostatic pressing (HIPing) and heat treatment on electron beam melted (EBM) Alloy 718 specimens built at different heights from the base-plate has been studied. While HIPing led to orders of magnitude reduction in defect content, conventional heat treatment without applied pressure was found to have no effect. Thermal post-treatment was found to eliminate inherent variability in phase constitution and hardness of as-built specimens. HIPing at high temperature was accompanied by grain coarsening, suggesting modification of the HIPing protocol.

heat treatment

Hot isostatic pressing

Alloy 718

Nanoindentation

Additive Manufacturing

Electron beam melting

Author

Sneha Goel

University West

Tejas Gundgire

University West

Johny Varghese

University of Hyderabad

Koteswararao V. V. Rajulapati

University of Hyderabad

Uta Klement

Chalmers, Industrial and Materials Science, Materials and manufacture

Shrikant Joshi

University West

Euro PM2019 – HIP Post Processing of AM Parts
Maastricht, Netherlands,

Subject Categories

Manufacturing, Surface and Joining Technology

Other Materials Engineering

Metallurgy and Metallic Materials

More information

Created

1/17/2020