IN718 Additive Manufacturing Properties and Influences

The results of tensile, fracture, and fatigue testing of IN718 coupons produced using the selective laser melting (SLM) additive manufacturing technique are presented. The data have been "sanitized" to remove the numerical values, although certain references to material standards are provided. This document provides some knowledge of the effect of variation of controlled build parameters used in the SLM process, a snapshot of the capabilities of SLM in industry at present, and shares some of the lessons learned along the way. For the build parameter characterization, the parameters were varied over a range that was centered about the machine manufacturer's recommended value, and in each case they were varied individually, although some covariance of those parameters would be expected. Tensile, fracture, and highcycle fatigue properties equivalent to wrought IN718 are achievable with SLM-produced IN718. Build and postbuild processes need to be determined and then controlled to established limits to accomplish this. It is recommended that a multivariable evaluation, e.g., designof experiment (DOE), of the build parameters be performed to better evaluate the covariance of the parameters