Shokoufeh completed her Undergraduate degree from University of Birmingham, United Kingdom and is currently pursuing her Masters of Science from University of Alberta, Canada. She joined us in September, 2021 and is currently working as a MSc Student in our group.
My Research Interests are Additive Manufacturing, Powder Bed Fusion, and Porosity Development
Fabricating some parts with a maximum density is important in some applications while producing controllable porosity is a required property in many significant technological applications, including lightweight constructions, capillary structures, aeration or filter components, medical implants, and tissue engineering. A review of existing studies showed that LPBF process parameters development for manufacturing thin wall 17-4 PH SS with porosity of more than 50 % is not studied yet.
In this study, an additive manufacturing technology, the selective laser melting (SLM) method, was employed for the first time to fabricate the thin porous with a defined level of porosity percentage. In this study, the central composite design (CCD) method is employed to study the influence of the SLM process parameters laser power, scan speed, and hatch distance on porosity generation. Computed tomography was also employed to quantify the pore percentage.
Selective laser melting of 17-4 PH stainless steel was performed with the ORLAS Coherent CREATOR 3D metal printer (Coherent, Inc., California, USA) which is equipped with an internal fiber having a maximal laser power of about 250 W at the build platform that offers superior beam quality with a diameter of 40 µm.
The statistical quadratic regression model is created for the estimation of desired porosity percentage generation with high prediction accuracy. With the help of the CT analysis, it was determined that for area laser energy densities between 30.48 and 11.59 J/mm3, the average porosity percentage from 33.12 to 65.26 μm can be adapted.