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Your search keyword '"Joseph W. Aroh"' showing total 2 results
Start Over Author "Joseph W. Aroh" Topic laser melting
2 results on '"Joseph W. Aroh"'

1. High speed synchrotron X-ray diffraction experiments resolve microstructure and phase transformation in laser processed Ti-6Al-4V

Author

Seunghee A. Oh, Rachel E. Lim, Joseph W. Aroh, Andrew C. Chuang, Benjamin J. Gould, Behnam Amin-Ahmadi, Joel V. Bernier, Tao Sun, P. Chris Pistorius, Robert M. Suter, and Anthony D. Rollett

Subjects
ti-6al-4v, martensite, laser melting, x-ray diffraction, in-situ /operando characterization, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

The microstructures of Ti-6Al-4V following laser processing depend primarily on the phase transformation of β to α, but their development is constrained by the rapidly changing temperature in the small fusion zone. In-situ synchrotron X-ray diffraction was utilized to probe the rapid phase evolution in single melt tracks with high angular and temporal resolution. Both fully martensitic and mixed α+α′+β microstructures were confirmed by microscopy. Cooling rates were inferred from the lattice parameter history and complementary thermal simulation. It was found that the threshold cooling rate for fully martensitic transformation is in the range between 2900 and 6500°C/s.

Published
2021
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2. High speed synchrotron X-ray diffraction experiments resolve microstructure and phase transformation in laser processed Ti-6Al-4V

Author

Benjamin Gould, Tao Sun, Rachel E. Lim, Anthony D. Rollett, Robert M. Suter, Seunghee A. Oh, Joseph W. Aroh, Behnam Amin-Ahmadi, Andrew Chihpin Chuang, P. Chris Pistorius, and Joel V. Bernier

Subjects
Materials science, Synchrotron X-Ray Diffraction, Analytical chemistry, ti-6al-4v, martensite, Microstructure, Laser, law.invention, in-situ /operando characterization, Transformation (function), x-ray diffraction, law, Phase (matter), Martensite, laser melting, X-ray crystallography, TA401-492, General Materials Science, Ti 6al 4v, Materials of engineering and construction. Mechanics of materials
Abstract

The microstructures of Ti-6Al-4V following laser processing depend primarily on the phase transformation of β to α, but their development is constrained by the rapidly changing temperature in the small fusion zone. In-situ synchrotron X-ray diffraction was utilized to probe the rapid phase evolution in single melt tracks with high angular and temporal resolution. Both fully martensitic and mixed α+α′+β microstructures were confirmed by microscopy. Cooling rates were inferred from the lattice parameter history and complementary thermal simulation. It was found that the threshold cooling rate for fully martensitic transformation is in the range between 2900 and 6500°C/s. High-speed synchrotron X-ray diffraction during operando laser processing suggests a new threshold between martensitic and diffusional phase transformation in Ti-6Al-4V occurring at higher cooling rates than previously reported.

Published
2021

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