Microscale Observation via High-Speed X-ray Diffraction of Alloy 718 During In Situ Laser Melting
| Autor: | Seunghee A. Oh, Niranjan D. Parab, Joseph W. Aroh, Andrew Chihpin Chuang, Benjamin Gould, Joel V. Bernier, Rachel E. Lim, Tao Sun, Anthony D. Rollett, Robert M. Suter |
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| Rok vydání: | 2020 |
| Předmět: |
Diffraction
Materials science Alloy 0211 other engineering and technologies General Engineering 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Laser Molecular physics Carbide law.invention Lattice constant law Phase (matter) X-ray crystallography engineering General Materials Science 0210 nano-technology Anisotropy 021102 mining & metallurgy |
| Zdroj: | JOM. 73:212-222 |
| ISSN: | 1543-1851 1047-4838 |
| Popis: | The laser melting process is accompanied by rapid evolution in temperature, phase, structure, and strain because of its high heating and cooling rates. In this study, the evolution of grains within a thin solid plate of Ni alloy 718 during laser processing was probed with in situ high-energy x-ray diffraction experiments. The high temporal and spatial resolution available in the measurement allowed us to study the rapid evolution of the melted region beneath the surface of the sample. The characterization of the evolution of secondary phases, i.e., Laves and carbide, was captured despite the weak diffracted peaks caused by small volume fractions. Thermal history was estimated based on changes in the lattice spacing from the thermal contraction upon cooling. The temporal variation in 2θ with azimuthal direction revealed the evolution in anisotropy of lattice spacing and thus of the mechanical state during laser processing. |
| Databáze: | OpenAIRE |
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