Localized Mechanical Properties of Additively Manufactured Metallic Parts

Additive manufacturing (AM) is a disruptive technology, which offers an easier way to create complex parts in less time. However, much of the current challenges are with respect to the magnitude of time spent and material waste during part qualification. The lengthy testing process hampers the adoption of additive manufacturing in various aerospace and automotive industries. In this study, our goal is to speed up the qualification process of AM metallic parts by establishing the location-based structure-property relationships using the thermal history. Here, we correlate the grain size with thermal history to estimate the local mechanical properties of the part at each location. Using the established Hall-Petch relationships for metallic parts, the yield strength is related to the grain size of the part. Local mechanical properties define the overall performance of the part. Location-based properties like yield strength are extended globally to the whole part by creating the global stiffness matrix ,which is used to predict the lifetime of a component. Hence, this approach reduces the time required to qualify an additively manufactured part to an extent.