The objective of this work was to evaluate the effects of HIP’ing on the metallurgical integrity of Inconel 718 additively manufactured using the laser fusion powder bed SLM process. Specifically, the SLM processing parameters were widely varied from established standard parameters to comparatively observe the effects of two secondary processes (a) heat treatment and (b) HIP’ing and heat treatment on the density and tensile properties of Inconel 718. The results indicated that both secondary processes of the SLM builds slightly improved the density of the Inconel 718 builds produced with energy range of 40 J/mm3 to 95 J/mm3, but the major density increase occurred on builds made with density energies above 95 J/mm3. Similarly, a very small effect of HIP’ing and heat treatment was observed on builds produced in the 40 J/mm3 to 95 J/mm3 power density range. However, the yield strength of the HIP and Heat treated increased up to 8% over the heat treated only material at energy densities above 95 J/mm3. In addition, the HIP and heat treated tensile elongation increased by at least 1.5 times over the HT only material. The results of this work indicate that HIP as a secondary process provides the flexibility to modify the SLM process parameters to improve productivity and produced sound Inconel 718 components with similar or better tensile properties as those of the wrought alloy.
- Better understand the impacts of heat treatment and hot isostatic pressing on Inconel 718 additively manufactured components.
- See relationships between energy input and part quality, before and after post processing.
- Gain insight into density changes in AM parts, before and after post processing.