The Effect of Milling Parameters on Surface Properties of Additively Manufactured Inconel 939

摘要

This research focuses on experimental studies on Inconel 939,which is a material used in aerospace applications where more commonly preferred Inconel 718 is not usable due to high-temperatures.Inconel 939 parts are often wrought or cast,while the studies are usually focused on durability and weldability of the material.There are studies that uses additive manufacturing method for complex parts;however,these parts need secondary processes to provide tight geometrical tolerances.A first-time study of machining on additively manufactured Inconel 939 material is presented in this paper with the focus on surface properties.Inconel 939 samples were manufactured by Direct Metal Laser Sintering(DMLS)process.Milling operations were performed on these samples with different cutting speeds and feeds to understand the effect on surface roughness and hardness.Design of experiments were performed such that the specimens were machined as"as-built"and heat treated(HT)conditions.The cutting direction according to build direction was also taken into account.The results showed that the cutting parameters,heat treatment condition and build direction have an effect on the surface properties.