|About this Abstract
||2019 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Fatigue and Fracture III
||Effect of Microstructure and Internal Defects on the Cyclic Deformation and Damage Behavior in Additively (SLM) Manufactured Al-Si Alloys
||Shafaqat Siddique, Mustafa Awd, Felix Frömel, Jochen Tenkamp, Frank Walther
|On-Site Speaker (Planned)
Additive manufacturing processes open new dimensions of technological freedom based on high complexity in design. The current studies focus on the effect of microstructure on the deformation and damage behavior of additively (SLM – selective laser melting) manufactured AlSi12 and AlSi10Mg alloys under fatigue loading. The investigations show that apart from elementary deformation processes especially gas porosity highly influences the lifetime of additively manufactured AlSi12 structures in HCF to VHCF regime. This know-how was further used to develop a fatigue prediction methodology for additively manufactured parts including local microstructure and defects as well as fatigue (constant and variable amplitude) loading. Hereby, based on micro-computed tomography the internal pore size, frequency and pore distance to surface could be correlated to the fatigue lifetime. By improving the relative density from 99.7 to 99.86%, the fatigue strength of AlSi12 could be increased by 47% from 60.5 MPa to 88.7 MPa at 1E9 cycles.
||Planned: Supplemental Proceedings volume