ICME 2023: App.: AM Processing IV
Program Organizers: Charles Ward, AFRL/RXM; Heather Murdoch, U.S. Army Research Laboratory
Thursday 11:10 AM
May 25, 2023
Room: Caribbean IV
Location: Caribe Royale
Session Chair: Matthew Dantin, Naval Surface Warfare Center Carderock Division
11:10 AM
High-throughput Computation and Process Design for Metal Additive Manufacturing: Sofia Sheikh1; Brent Vela1; Pejman Honarmandi1; Peter Morcos1; David Shoukr1; Abdelrahman Kotb1; Ibrahim Karaman1; Alaa Karaman1; Raymundo Arroyave1; 1Texas A&M University
In additive manufacturing (AM),to accelerate the fabrication of porosity-free parts, the optimal processing conditions of a material needs to be determined. The printability of alloys must be surveyed regarding their chemical composition and processing conditions. Since this union of the compositional and processing design spaces are intractable for experimental exploration alone, high-throughput (HTP) computational frameworks are needed to guide the search for highly printable alloys and processing parameters. In this work, various criteria for process-induced defects considered properties predicted using CALPHAD, processing parameters, and melt pool profiles obtained by thermal models. We verify the framework by constructing printability maps for the CoCrFeMnNi system. Furthermore, the framework searches for alloys in the Co-Cr-Fe-Mn-Ni HEA-constrained space to reduce the formation of macroscopic defects. This framework enables the systematic investigation of the printability of alloy spaces and can be used as a valuable tool in AM-centering alloy design.
11:30 AM
Computational Design and Modelling of Nickel-based Alumindes High Entropy Alloys: Peter Odetola1; Peter Olubambi1; 1University of Johannesburg
Novel materials with improved performance and advanced application fit property profiles such as lightweight, thermal stability, high-temperature strength, and good oxidation resistance can be designed within the framework of the vast compositional space available in high entropy alloys (HEAs). The study is to design nickel-aluminide (Ni-Al) based high-entropy alloys for lightweight, high strength, and high-temperature applications using a CALPHAD-based tool and thermodynamic physical parameters such as mixing entropy, mixing enthalpy, and valence electron concentration (VEC) to design the right match of multi principal elements. The study will establish the use of Thermo-Calc software to perform thermodynamic modelling of the phases present, phase diagrams, and transformation temperatures. The Thermo-Calc software will be used to access the necessary databases for kinetic and thermodynamic calculations for the nickel aluminide-based HEAs. The study aims to design novel HEAs based on nickel that may replace the superalloys in aero-engines.
11:50 AM
Effect of Cooling Rates on the Evolution of Microstructure, Phase Transformation, and Strain in Ti-6Al-4V Studied by High Speed Synchrotron X-ray Diffraction: Rajib Halder1; Seunghee Oh1; Anthony Rollett1; Andrew Chuang2; 1Carnegie Mellon University; 2Argonne National Laboratory
The laser melting process involves rapid evolution of microstructure, phase transformation, temperature history and strain due to its high heating as well as cooling rates. In this study, high speed synchrotron X-ray diffraction technique was utilized to investigate the effect of cooling rates on phase transformation and on the evolution of temperature history, and strain in Ti-6Al-4V during in-situ laser melting process. Different cooling rates were achieved by designing multi-pass scans (back & forth) with different delay times between passes. The high temporal and spatial resolution available in the measurement enabled us to study various microscale phenomena that occur during rapid evolution of the small fusion zone. Microstructural features were probed using optical and scanning electron microscopy. Thermal history, cooling rate, and strain were estimated based on changes in the lattice spacing resulting from the thermal contraction upon solidification.