AeroMat 2018 Conference and Exposition
May 07, 2018 - May 09, 2018
Orlando, FL

QuesTek's Jeff Grabowski and Dr. Ricardo Komai will be giving presentations at AeroMat 18:

1. New High Performance Fe, Al and Ti-based Alloys Designed Specifically for Additive Manufacturing Processes

Presenter: Jeff Grabowski


Current alloys used in Additive Manufacturing (AM) were originally designed to be processed via traditional metallurgy paths such as forging, and have different microstructures and properties when put through AM processes. Additionally, heat treating AM-built alloys according to standard industry practice causes material performance issues.

New material chemistries designed specifically for AM processing and the subsequent thermal processing steps tailored for the unique microstructures must be developed to enable AM components to reach enhanced performance.

Integrated Computational Materials Engineering technologies allows for the optimization of legacy alloys and design of entirely new alloys tailored specifically for AM, and also to optimize post-build heat treatments across a variety of alloy systems including Al, Ti, Ni, Cu, W, Fe and stainless steel.

This talk will provide technical updates and component design opportunities based on several ongoing projects where properties are being demonstrated in powder and wire AM, including: (i) a Ti new alloy with increased strength over traditional Ti-6-4, (ii) high performance Ferrium C64 gear steel for gear applications (iii) new, printable, high strength aluminum alloys for use at room temperature and temperatures up to 325°C and (iv) stainless steel and ultra high strength steels.

2. An Integrated Computational Materials Engineering (ICME) approach for the design of High-Entropy Alloys (HEAs) for Aeroturbine Propulsion Systems

Presenter: Dr. Ricardo Komai


Advancements in propulsion systems can be accelerated by advances in materials that are candidates for Ni-based superalloy replacements. Current aeroturbine systems commonly employ Ni-based alloys, but inherently limit the performance of such turbines by their melting point (~1455oC). In order to achieve higher performance engine efficiencies, the materials for aeroturbines must push high temperature stability even hotter. High-entropy alloys (HEAs) are candidates for such applications being that they are single-phase, disordered, and entropically stabilized at high temperatures. Body-centered cubic (BCC) HEAs that contain high contents of refractory elements will serve as excellent potential candidates for aeroturbine materials. However, to predict the compositions, microstructure, properties, and performance of HEAs is a task that is not so easily achieved. The current application of the CALPHAD (Calculation of Phase Diagrams) approach to predict both equiatomic and non-equiatomic, single-phase HEAs will be discussed.

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