M
Michael M. Kirka
Researcher at Oak Ridge National Laboratory
Publications - 83
Citations - 3690
Michael M. Kirka is an academic researcher from Oak Ridge National Laboratory. The author has contributed to research in topics: Microstructure & Superalloy. The author has an hindex of 25, co-authored 65 publications receiving 2475 citations.
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Journal ArticleDOI
Site specific control of crystallographic grain orientation through electron beam additive manufacturing
Ryan R. Dehoff,Michael M. Kirka,William J. Sames,Hassina Z. Bilheux,Anton S. Tremsin,Larry E Lowe,S. Suresh Babu +6 more
TL;DR: In this paper, columnar to equiaxed transitions during solidification were used to promote the growth of highly misoriented micron scale grains outlining the letters D, O and E, through the thickness of a 25·4 mm tall bulk block comprised of primarily columnar oriented grains made of the nickel base superalloy Inconel 718.
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Numerical modeling of heat-transfer and the influence of process parameters on tailoring the grain morphology of IN718 in electron beam additive manufacturing ☆
Narendran Raghavan,Ryan R. Dehoff,Sreekanth Pannala,Srdjan Simunovic,Michael M. Kirka,John A. Turner,Neil N. Carlson,S. Suresh Babu,S. Suresh Babu +8 more
TL;DR: In this article, the authors developed a melt scan strategy for electron beam melting of nickel-base superalloy (Inconel 718) and also analyzed 3-D heat transfer conditions using a parallel numerical solidification code (Truchas) developed at Los Alamos National Laboratory.
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Effects of heat treatments on microstructure and properties of Ti-6Al-4V ELI alloy fabricated by electron beam melting (EBM)
Haize Galarraga,Robert J. Warren,Diana A. Lados,Ryan R. Dehoff,Michael M. Kirka,Peeyush Nandwana +5 more
TL;DR: In this article, different heat treatments were performed based on three approaches in order to study the effects of heat treatments on the unique microstructure formed during the EBM fabrication process.
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Effects of the microstructure and porosity on properties of Ti-6Al-4V ELI alloy fabricated by electron beam melting (EBM)
TL;DR: In this paper, the relationship between the porosity and the mechanical properties of the Ti-6Al-4V ELI (extra low interstitials) alloy has been investigated.
Journal ArticleDOI
Localized melt-scan strategy for site specific control of grain size and primary dendrite arm spacing in electron beam additive manufacturing
Narendran Raghavan,Srdjan Simunovic,Ryan R. Dehoff,Alex Plotkowski,John A. Turner,Michael M. Kirka,Suresh Babu +6 more
TL;DR: In this paper, a new melt-scan strategy for inducing site specific, on-demand control of solidification microstructure was developed to induce variations in grain size and primary dendrite arm spacing in Inconel 718 parts produced by the electron beam additive manufacturing system.