Investigation of grain growth and microstructural evolution in electron beam melting additive manufacturing process

Chandra, Shubham

doi:10.32657/10356/143917

Cited by 1 publication

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References 241 publications

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“…Equiaxed grains were formed in the EB-PBF sample owing to the high thermal conductivity of the powder bed as a result of the large powder particle size, which has been systematically investigated previously using the same process and powder by Chandra [163]. In general, the grain size d is critical in determining the mechanical properties of the alloy, and grain refinement is beneficial to increasing its tensile strength σ, which increases with decreasing d, as expressed by the Hall-Petch relationship [164]:…”

Section: Effects Of Grain Size and Texturementioning

confidence: 93%

Design and additive manufacturing of mechanical metamaterials

Zeng

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Mechanical metamaterials represent a new class of architected materials that exhibit exceptional mechanical properties and unique responses such as high stiffness, extreme strength-to-weight ratios, and enhanced energy absorption capacity, achieved through rationally designed geometries instead of compositions. However, conventional manufacturing methods, such as casting, forging, and machining, are not feasible for producing such metamaterials because of their internal intricate features. Additive manufacturing (AM) materialises three-dimensional (3D) digital models into actual parts by adding materials in a layer-by-layer process. The layer-by-layer fabrication mode of the emergent additive manufacturing (AM) technology enables the creation of parts displaying intricate geometries with exceptional accuracy. Metallic metamaterials have been successfully produced using AM at different length scales, all of which demonstrate excellent mechanical properties. Moreover, owing to the fast cooling rate, additively manufactured metals possess non-equilibrium microstructural features that are sensitive to process parameters, resulting in superior intrinsic material properties. This Ph.D. research is proposed to investigate the mechanical properties of mechanical metamaterials fabricated by metal AM processes and explore design approaches in improving the mechanical performance of auxetic metamaterials.Firstly, this study investigated a specific type of metamaterial, namely, auxetic metamaterials with a two-dimensional (2D) hexachiral design. Hexachiral auxetic metamaterials can exhibit unconventional properties, such as a negative Poisson's ratio that can achieve superior mechanical properties, including energy absorption and indentation resistance. The thickness ratio between the wavy ligament and centre ring, which is denoted by t * , has a critical influence on the isotropic mechanical properties of the hexachiral structures. This work aims to investigate the effects of t * on the isotropic auxeticity of wavy hexachiral

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Section: Effects Of Grain Size and Texturementioning

confidence: 93%

Design and additive manufacturing of mechanical metamaterials

Zeng

View full text Add to dashboard Cite

show abstract

Investigation of grain growth and microstructural evolution in electron beam melting additive manufacturing process

Cited by 1 publication

References 241 publications

Design and additive manufacturing of mechanical metamaterials

Design and additive manufacturing of mechanical metamaterials

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