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Meeting Materials Science & Technology 2020
Symposium Additive Manufacturing of Metals: Complex Microstructures and Architecture Design
Presentation Title Microstructural Features and Mechanical Properties of a Newly Designed Steel Fabricated by Laser Powder Bed Fusion
Author(s) Yuan Tian, Robert Palad, Clodualdo Jr. Aranas
On-Site Speaker (Planned) Robert Palad
Abstract Scope A new iron-based alloy, M789, with good printability and corrosion resistance has been recently developed and additively manufactured by laser power bed fusion process. The relationship between the microstructural features and the mechanical properties of M789 steel was studied and evaluated. In the as-printed condition, epitaxial grain growth of cellular dendritic structure inside the melt pool was observed. The primary dendrite arm spacing was measured to be 0.42▒0.12 Ám. The electron backscatter diffraction maps suggest the formation of elongated columnar grains with significant low-angle grain boundaries. In the solution annealed and aged samples, melt pool boundaries and scan tracks disappeared; large needle-like martensitic structures were evident with fewer LAGBs. Moreover, spherical ETA-Ni3Ti precipitates were formed during the heat-treated process, which led to significant increase in hardness, tensile and yield strength with values of 52.4▒0.7HRC, 1798▒4MPa and 1714▒13MPa, respectively. Thermodynamic and mechanical properties simulation were consistent with the experimental data.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Additive Manufacturing of Pure Magnesium
Alloy and Process Modification for Microstructure Control in Additively Manufactured Alloys
Application of Photodiode Sensor for Contour Extraction of Part Features in the Laser Powder Bed Fusion Process
Control of Nanoscale Lamellae in Bulk Al-Cu Eutectic Samples Through Laser Powder Bed Fusion
Cracking in Additively Manufactured Refractory Metals
Engineering the Plasticity of SLM Steel via Crystallographic Texture Control
Evaluation of Microstructure in Multi Bead Ti-6Al-4V
Fabrication of High Temperature High Strength Austenitic Steels by Laser Powder-bed Fusion
Laser Powder Bed Fusion of Single-crystalline-like Stainless Steel 316L; From Samples to Parts
Microstructural Features and Mechanical Properties of a Newly Designed Steel Fabricated by Laser Powder Bed Fusion
Microstructure of Alloy 247LC Manufactured by Laser Powder Bed Fusion
Mitigating Stray Grain Nucleation during the Laser Powder Bed Fusion of Single Crystal CMSX-4
Modeling of Grain Growth in Metal Printing
Secondary Orientation Preference of Ni-based Superalloy Single Crystals Produced via Electron Beam Melting
Synchrotron X-ray Studies on Additive Manufacturing and Materials
The Structure of Cellular Features in Additively Manufactured 316L

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