Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 79, Issue -, Pages 37-46Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2018.11.003
Keywords
Tungsten; Selective laser melting (SLM); Scanning track; Geometrical characteristics; Surface morphologies
Funding
- Science Challenge Project [TZ2018006-0301-02, TZ2018006-0303-03]
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Due to the high melting point and high heat conductivity, selective laser melting (SLM) of tungsten is still challenging. To have a better understanding of SLM tungsten parts, the effects of processing parameters such as laser power and scanning speed on scanning tracks formation of pure tungsten powder were investigated. As linear energy increased with increasing laser power and decreasing scanning speed, the height and contact angle of scanning tracks gradually reduced, while the width and penetration depth increased. Owing to the good wetting and spreading, the flow front of scanning tracks gradually became smooth and stable with the increased linear energy. However, the transverse cracks induced by large temperature gradient and high cooling rate appeared on the surface of the scanning tracks at linear energy of more than 1.75 J/mm. A maximum temperature of 4630.27 degrees C and high cooling rate of 8.6 x 10(6) degrees C/s were obtained during SLM process of tungsten powder when the linear energy was 1.75 J/mm. This work provides scientific guidance for SLM-processed tungsten parts.
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