About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
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Symposium
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Additive Manufacturing: Processing, Microstructure and Material Properties of Titanium-based Materials
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Presentation Title |
Time-resolved Characterization of Evolving Phase and Microstructure of Ti-6Al-4V during Laser Processing with Synchrotron X-ray Diffraction |
Author(s) |
Seunghee Oh, Rachel Lim, Joseph Aroh, Andrew Chuang, Benjamin Gould, Behnam Amin-Ahmadi, Joel Bernier, Tao Sun, P. Chris Pistorius, Robert Suter, Anthony Rollett |
On-Site Speaker (Planned) |
Seunghee Oh |
Abstract Scope |
Ti-6Al-4V (Ti64), one of the extensively studied alloys for additive manufacturing, is a α+β titanium alloy involving the solid-state phase transformation. The phases and microstructures of Ti64 are crucial components in determining material properties. However, their evolution is complicated depending on the process conditions and the examination of the transformation of β to α is limited owing to its high transformation temperature. Moreover, the extremely fast process in small volumes makes it more challenging to characterize the development during laser processing. In this study, an in-situ synchrotron X-ray diffraction with a high temporal and spatial resolution was utilized to observe the rapid phase evolutions in the differently developed melt pools. The estimated temperature based on the lattice parameter change is compared with the simulated temperature to interpret the phase evolution during laser processing. Microscopy provides complementary information to the X-ray measurements to evaluate, e.g., the occurrence of martensitic transformation. |