Michael Kirka
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View article: Evaluation of processability, composition, and residual strain of electron beam powder bed fusion produced Mo–7Re–1HfC alloy
Evaluation of processability, composition, and residual strain of electron beam powder bed fusion produced Mo–7Re–1HfC alloy Open
Due to their excellent strength, refractory metal alloys have historically been a preferred material for applications at elevated temperatures. However, overcoming the challenges posed by their high ductile–to-brittle transition temperatur…
View article: Microstructure-sensitive mechanical behavior of an additively manufactured psuedoelastic shape memory alloy
Microstructure-sensitive mechanical behavior of an additively manufactured psuedoelastic shape memory alloy Open
The additive manufacturing of shape memory alloys into complex geometries enables fabrication of advanced functional systems across a variety of fields and domains. This work presents results focused on the mechanical behavior of additivel…
View article: Design of Silicide-Strengthened Nb–Si–Cr–(Mo) alloys for additive manufacturing
Design of Silicide-Strengthened Nb–Si–Cr–(Mo) alloys for additive manufacturing Open
Three high–intermetallic volume Nb–Si–Cr–(Mo) alloys were designed using CALPHAD modeling with the goal of identifying high–specific strength, oxidation-resistant alloys that can be additively manufactured using powder bed fusion. The sili…
View article: Uncertainty Quantification of Fatigue Behavior of Rough AM Surfaces and Microstructures to Enable Hydrogen Gas Turbine
Uncertainty Quantification of Fatigue Behavior of Rough AM Surfaces and Microstructures to Enable Hydrogen Gas Turbine Open
Modifying fossil-fueled industrial gas turbines to utilize low or zero-carbon fuels, such as hydrogen or hydrogen-natural gas blends, is a complex endeavor. The successful implementation of this technology hinges on three key design criter…
View article: Using Additive Manufacturing to Repair Gas Turbine Hot Section Components
Using Additive Manufacturing to Repair Gas Turbine Hot Section Components Open
Ni-based superalloys are used in the hot sections of gas turbine engines due to their excellent high temperature performance. During service the material degrades due to exposure at high temperature and mechanical loads. Hence, utility pro…
View article: LPBF Processability of NiTiHf Alloys: Systematic Modeling and Single-Track Studies
LPBF Processability of NiTiHf Alloys: Systematic Modeling and Single-Track Studies Open
Research into the processability of NiTiHf high-temperature shape memory alloys (HTSMAs) via laser powder bed fusion (LPBF) is limited; nevertheless, these alloys show promise for applications in extreme environments. This study aims to ad…
View article: Novel Hot Gas Components for Gas Turbine Engines Enabled by Materials and Additive Manufacturing Process Development
Novel Hot Gas Components for Gas Turbine Engines Enabled by Materials and Additive Manufacturing Process Development Open
Additive Manufacturing (AM), also known as 3D printing, has emerged as a manufacturing method that enables new design freedom for gas turbine engine manufacturers. However, the material selection for AM processable high-temperature super a…
View article: Final Scientific/Technical Report Rapid Design and Manufacturing of High-Performance Materials for Turbine Blades
Final Scientific/Technical Report Rapid Design and Manufacturing of High-Performance Materials for Turbine Blades Open
This research demonstrated the concept of carbide precipitation-strengthened refractory high entropy alloys (RHEA). The advantage of a precipitation strengthened alloy is all phases are in thermodynamic equilibrium promoting microstructura…
View article: Correlations of Interlayer Time with Distortion of Large Ti-6Al-4V Components in Laser Metal Deposition with Wire
Correlations of Interlayer Time with Distortion of Large Ti-6Al-4V Components in Laser Metal Deposition with Wire Open
Laser metal deposition with wire (LMD-w) is one of the emerging additive manufacturing (AM) technologies for large-scale aerospace components due to high deposition rates and material efficiency. However, it often results in undesired stre…
View article: Electron Beam Powder Bed Fusion Additive Manufacturing of Refractory Metals
Electron Beam Powder Bed Fusion Additive Manufacturing of Refractory Metals Open
The processing of refractory metals via additive manufacturing (AM) presents an opportunity to fabricatecomponents not possible through traditional powder metallurgy techniques. However, processing via AM isextremely challenging and there …
View article: Creep behavior of $\\gamma$-TiAl fabricated via electron beam additive manufacturing
Creep behavior of $\\gamma$-TiAl fabricated via electron beam additive manufacturing Open
$\\gamma$-TiAl is a desirable structural engineering alloy with excellent high temperature specific strength. This material system has been shown to be processable at industrial scales via additive manufacturing. In this work we investigat…