Atomic-scale grain boundary engineering to overcome hot-cracking in additively-manufactured superalloys
Paraskevas Kontis,Edouard Chauvet,Zirong Peng,Junyang He,Alisson Kwiatkowski da Silva,Dierk Raabe,Catherine Tassin,Jean-Jacques Blandin,Stéphane Abed,Rémy Dendievel,Baptiste Gault,Baptiste Gault,Guilhem Martin +12 more
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TLDR
In this article, a near-atomic-scale approach was used to investigate the details of the compositional decoration of grain boundaries in the coarse-grained, columnar microstructure in parts built from a non-weldable nickel-based superalloy by selective electron-beam melting.About:
This article is published in Acta Materialia.The article was published on 2019-09-15 and is currently open access. It has received 142 citations till now. The article focuses on the topics: Grain boundary & Liquation.read more
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Quantification of Grain Boundary Segregation in Nanocrystalline Material
TL;DR: It is demonstrated how this can be achieved using an approach that combines the accuracy of structural characterization in transmission electron microscopy with the 3D chemical sensitivity of atom probe tomography, which indicates that ω is the most influential crystallographic parameter in this regime.
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Metallurgy, mechanistic models and machine learning in metal printing
TL;DR: In this paper, the authors examined advances in metal printing focusing on metallurgy, as well as the use of mechanistic models and machine learning and the role they play in the expansion of the additive manufacturing of metals.
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Alloys-by-design: Application to new superalloys for additive manufacturing
Yuanbo T. Tang,Chinnapat Panwisawas,Joseph N. Ghoussoub,Yilun Gong,John W. G. Clark,André A. N. Németh,D. Graham McCartney,Roger C. Reed +7 more
TL;DR: In this paper, a new grade of γ/γ′ nickel-based superalloy for the additive manufacturing process is designed using computational approaches, taking account of the need to avoid defect formation via solidification and solid-state cracking.
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About metastable cellular structure in additively manufactured austenitic stainless steels
Decheng Kong,Decheng Kong,Chaofang Dong,Shaolou Wei,Xiaoqing Ni,Liang Zhang,Ruixue Li,Li Wang,Cheng Man,Xiaogang Li +9 more
TL;DR: In this article, the authors review the most recent research momentum regarding the formation mechanisms (elemental segregation, dislocation cell and oxide inclusion), the kinetics of the size and morphology, the growth orientation and the thermodynamic stability of these cellular structures by taking AM austenitic stainless steel as an exemplary material.
References
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A New Hot-Tearing Criterion
TL;DR: In this article, a new criterion for the appearance of hot tears in metallic alloys is proposed, based upon a mass balance performed over the liquid and solid phases, which accounts for the tensile deformation of the solid skeleton perpendicular to the growing dendrites and for the induced interdendritic liquid feeding.
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The influence of the laser scan strategy on grain structure and cracking behaviour in SLM powder-bed fabricated nickel superalloy
TL;DR: In this paper, the authors used optical and SEM micrographs to show the observed grain structure in the SLM fabricated and Hot Isostatically Pressed (HIPped) material and found that the repeating pattern shown in the grain structure has been linked to the overlapping of the "island" pattern used as standard in the Concept Laser M2 powder-bed facility.
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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.