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Meeting 2023 TMS Annual Meeting & Exhibition
Symposium 2023 Technical Division Student Poster Contest
Presentation Title SPG-31 Laser-Powder Bed Fusion of Ti-6Al-2Sn-4Zr-2Mo-0.08Si (Ti-6242): As-built Properties, Kinetics of α to β Phase Transformation, and Design of Heat Treatment
Author(s) Harish Chandra Kaushik, Mahdi Habibnejad Korayem, Amir Hadadzadeh
On-Site Speaker (Planned) Harish Chandra Kaushik
Abstract Scope Ti-6242 is a near-α high-temperature titanium alloy. As a near-α alloy, the evolution of the β phase with different volume fractions and morphologies will affect the strength and ductility. On the other hand, laser powder bed fusion (L-PBF) has enabled the fabrication of metals with ultrafine, metastable, and hierarchical microstructures. Such microstructures contribute to strength and ductility through distinct mechanisms at different length scales. In this study, Ti-6242 is fabricated using L-PBF with different energy densities. The kinetics of α to β phase transformation in the L-PBF samples is then studied using differential scanning calorimetry (DSC). The kinetics results are used to design a two-step heat treatment to enhance the ductility at minimal strength loss, through the evolution of the β phase with various volume fractions and morphologies. The microstructure is studied using multi-scale techniques including OM, SEM, EBSD, and TEM to elaborate on the mechanisms of strengthening and toughening.
Proceedings Inclusion? Undecided
Keywords Additive Manufacturing, Phase Transformations, Mechanical Properties

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SPG-18: Characterization of Microstructural Heterogeneities in Electron Beam Additively Manufactured Haynes 282
SPG-19: Comparison of Experimental and Analytical Melt Pool Geometries for High Thermal Conductivity Refractory Metals Using ANSYS
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SPG-21: Development of a Generalized Fatigue Assessment Approach for Steel Castings
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SPG-25: Effects of the Reduction Temperature and Amount of Diluent on the Properties of High-purity Tantalum Powder Prepared via the Hunter Process
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SPG-34: Multi-scale In Situ Studies of Deformation Mechanism of L-PBF 316L Stainless Steels
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