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| Abstract No.: |
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Scheduled at:
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Friday, May 06, 2022, Hall G1 9:20 AM
Laser Cladding
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| Title: |
Study on the microstructure development in a laser-cladded tantalum layer
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| Authors: |
Kang Yuan* / BGRIMM Technology Group, P.R. China
Xiaoxiao Pang / BGRIMM Technology Group, China
Ziqiang Pi/ BGRIMM Technology Group, China
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| Abstract: |
Tantalum is an important heavy element in chemical, medical care, and electronic industries. Tantalum can be made as coatings or 3D-printing structures to improve the properties of components. Laser cladding is one of important methods, which can be used to make tantalum layers. In this study, pure spherical Ta powders were made by induced plasma sphero technique. In the laser cladding process, the powders were sent into high-energy laser zone and were melted at the surface of a steel substrate to create a Ta layer. The microstructure development in the Ta layer was investigated in a scanning electron microscope. The results showed that the layer was basically dense with some pore/crack defects. In the layer, typical dendritic crystalline structures were formed. With the help of an energy dispersive spectroscope, Fe was detected in the Ta layer. The top surface had about 5% Fe while at the bottom of the cladded layer 15% Fe was detected. So, the diffusion of Fe upwards occurred. With the participant of Fe, the microstructure of the Ta layer was changed. Thermocalc software was used to simulate the phase constitution at different Ta-Fe compositions. The results by the simulation basically agreed with the experimental observations. The mechanism of the formation of defects such as pores and cracks was also discussed in this paper.
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