摘要 The tungsten thin wall parts which were used as high-performance collimator devices were fabricated by optimizing selective laser melting laser parameters. The effect of laser power and scan rate on wall thickness and surface morphology of tungsten thin wall parts was investigated, respectively. The results indicated that the wall thickness increased with the enhancement in laser power as a linear relationship. On the contrary, the wall thickness decayed exponentially with the acceleration in laser scan rate. Meanwhile, the wall thickness of the parts fabricated by laser double-pass melting was thinner than that fabricated by laser single-pass melting. In addition, mathematic models for selecting suitable laser power and laser scan rate to fabricate specified tungsten thin wall parts were proposed. Furthermore, the effects of laser parameters on the top surface roughness, adhesive parts and hot cracks were also discussed.
Abstract：The tungsten thin wall parts which were used as high-performance collimator devices were fabricated by optimizing selective laser melting laser parameters. The effect of laser power and scan rate on wall thickness and surface morphology of tungsten thin wall parts was investigated, respectively. The results indicated that the wall thickness increased with the enhancement in laser power as a linear relationship. On the contrary, the wall thickness decayed exponentially with the acceleration in laser scan rate. Meanwhile, the wall thickness of the parts fabricated by laser double-pass melting was thinner than that fabricated by laser single-pass melting. In addition, mathematic models for selecting suitable laser power and laser scan rate to fabricate specified tungsten thin wall parts were proposed. Furthermore, the effects of laser parameters on the top surface roughness, adhesive parts and hot cracks were also discussed.
Yan-jun Xie,Huai-chao Yang,Xue-bing Wang, et al. Control of wall thickness and surface morphology of tungsten thin wall parts by adjusting selective laser melting parameters[J]. Journal of Iron and Steel Research International, 2019, 26(2): 182-190.
L. C. Zhang, H. Attar.?Advanced Engineering Materials. 18 (2016) 463-475.
[12]
M. Badrossamay, T.H.C. Childs. International Journal of Machine Tools and Manufacture. 47(2007) No. 5, 779-784.
[13]
I. Yadroitsev, L. Thivillon, P. Bertrand, I. Smurov. Applied Surface Science. 254 (2007) 980-983.
[14]
S. Moore, K. Kouris and I. Cullum. Eur. J. Nucl. Med. 19(1992)138-150.
[15]
D. Karel, V. Stefaan, V. A. Karen. Med. Phys. 40(2013)012501-1-11.
[16]
L. Lu, J.Y.H. Fuh, Y.S. Wong, Laser-induced Materials and Processes for Rapid Prototyping, 1st edition ed., Springer Science+Business Media, New York, 2001.
[17]
D. Buchbinder, H. Schleifenbaum, S. Heidrich, W. Meiners, J. Bültmann. Physics Procedia. 12(2011)271-278.
2019, Vol. 26 
