About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques III
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Presentation Title |
Neutron Diffraction Microstructural and Deformation Analysis of Additively Manufactured Alloys |
Author(s) |
Kenta Yamanaka, Manami Mori, Yusuke Onuki, Shigeo Sato, Akihiko Chiba |
On-Site Speaker (Planned) |
Kenta Yamanaka |
Abstract Scope |
Powder bed fusion (PBF) additive manufacturing is capable of fabricating metallic materials under extreme conditions; thus, deeper understandings of the unique microstructural evolution and the resulting mechanical behavior are of crucial importance. In this study, we examined the electron beam and laser PBF Ti-6Al-4V alloy and alloy 718 using time-of-flight neutron diffraction measurements at iMATERIA (BL20), J-PARC, Japan. The convolutional multiple whole profile (CMWP) fitting successfully determined the bulk-averaged dislocation density for the alpha-matrix of Ti-6Al-4V, clarifying the contribution of dislocation hardening. Moreover, using Rietveld texture analysis (RTA), we revealed the hierarchal microstructures of Ti-6Al-4V alloys with multiple Burgers orientation relationships among the prior beta-phase, alpha-laths, and nanosized alpha-phase precipitates. RTA also enabled precise quantification of the volume fraction of the nanosized beta-phase precipitates. These techniques were also applied to the in situ tensile testing of a highly textured, precipitation-hardened Ni-base superalloy, clarifying the anisotropic plasticity. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Characterization, Phase Transformations |