|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing Fatigue and Fracture V: Processing-Structure-Property Investigations and Application to Qualification
||Using Laser Powder Bed Fusion to Create Functionally-Graded Inconel 718 Superalloy Microstructures: Process Development and Local Mechanical Properties Characterisation
||Moataz M. Attallah, Bonnie Attard, Yu-Lung Chiu, Sam Cruchley, Richard Moat, Alex Forsey
|On-Site Speaker (Planned)
||Moataz M. Attallah
In laser powder bed fusion, the thermal gradient; G, and solidification rate; R, determine whether columnar or equiaxed microstructures form. By changing parameters in the scanning strategy, G and R can be modified thus changing the microstructure obtained. In this study, one parameter; island size, in the island scanning strategy was altered for each condition to generate Inconel 718 Ni-superalloy graded microstructures. The mechanical behaviour of the uniform and graded microstructure was investigated at room temperature through digital image correlation integrated tensile testing. The conditions resulted in different grain sizes and degrees of texture. The highly textured condition was found to have an elongation at fracture of less than 10% while the low texture condition had an elongation to fracture of ~18%. Failure for the graded microstructure occurred in the highly textured region indicating that the grain size and texture can be used to tailor the mechanical performance.