Journal
3D PRINTING AND ADDITIVE MANUFACTURING
Volume 10, Issue 4, Pages 640-649Publisher
MARY ANN LIEBERT, INC
DOI: 10.1089/3dp.2021.0221
Keywords
pulse shaping; cermets; additive manufacturing; carbides
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In this study, TiC-Fe cermets were fabricated using pulse shaping technique and regular laser pulse wave for the first time in selective laser melting (SLM). The effect of laser peak power and pulse shaping on the microstructure development was investigated, and the results showed that pulse shaping can effectively avoid cracking in brittle materials processed by SLM.
In the present study, TiC-Fe cermets were fabricated through selective laser melting (SLM) for the first time employing pulse wave using a pulse shaping technique and regular laser pulse wave. Two samples were fabricated each with adapting pulse shaping technique and regular laser pulse wave with varied laser peak power and exposure time to obtain an optimized parameter. The pulse shaping technique proves to be an optimal method for fabrication of the TiC-Fe-based cermet. The effect of the laser peak power and pulse shaping on the microstructure development was investigated through scanning electron microscopy and X-ray diffraction analysis. Two-phased microstructures revealed the distribution of TiC and Fe. A maximum hardness and fracture toughness of 1010 +/- 65 MPa and 16.3 +/- 1.7 MPa m(1/2), respectively, were observed for the pulsed-shaped samples illustrating that pulse shaping can be an effective way to avoid cracking in brittle materials processed by SLM.
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