What post-processing steps are needed for SLM-printed Inconel 718 parts?

Hot Isostatic Pressing (HIP)

SLM-printed Inconel 718 typically contains small residual porosity from rapid solidification. Hot isostatic pressing (HIP) is used to densify the material by applying uniform pressure and high temperature. This process significantly improves fatigue resistance and fracture toughness, making it essential for aerospace-grade components.

Heat Treatment and Precipitation Hardening

Inconel 718 benefits from solution aging and heat treatment to activate γ′ and γ″ precipitation phases. These phases enhance tensile strength and creep performance, allowing SLM-built parts to meet or exceed properties of cast or forged equivalents.

Machining and Finishing Processes

Critical features such as sealing surfaces, threads and mounting interfaces are refined using EDM or CNC machining. These processes ensure dimensional accuracy and remove any remaining recast layers or surface irregularities from the printing process.

Inspection and Validation

To verify performance, each part undergoes material testing and analysis, including CT scanning, metallographic analysis and mechanical property testing. This confirms density, microstructural uniformity and fatigue reliability for use in aerospace and aviation or power generation applications.