期刊
OPTICS AND LASER TECHNOLOGY
卷 84, 期 -, 页码 9-22出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2016.04.009
关键词
Additive manufacturing; Selective laser melting (SLM); Numerical simulation; Melting/solidification mechanism; TiC/Inconel 718
资金
- National Natural Science Foundation of China [51575267, 51322509]
- Top-Notch Young Talents Program of China
- Outstanding Youth Foundation of Jiangsu Province of China [BK20130035]
- Program for New Century Excellent Talents in University [NCET-13-0854]
- Science and Technology Support Program (The Industrial Part)
- Jiangsu Provincial Department of Science and Technology of China [BE2014009-2]
- 333 Project [BRA2015368]
- Aeronautical Science Foundation of China [2015ZE52051]
- Shanghai Aerospace Science and Technology Innovation Fund [SAST2015053]
- Fundamental Research Funds for the Central Universities [NE2013103, NP2015206, NZ2016108]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
A three-dimensional finite element model is proposed to study the effects of laser power and scan speed on the thermal behavior and melting/solidification mechanism during selective laser melting (SLM) of TiC/Inconel 718 powder system. The cooling time during powder delivery is taken into account to simulate the actual production process well. It shows obviously the existence of heat accumulation effect in SLM process and, the tailored set of cooling time of 10 ms during powder delivery alleviates that effectively. The maximum temperature gradient in the molten pool slightly increases from 1.30 x 10(4) degrees C/mm to 2.60 x 104 degrees C/mm as the laser power is increased from 75 W to 150 W. However, it is negligibly sensitive to the variation of scan speed. There is a positive corresponding relationship between the maximum rate of temperature change and processing parameters. A low laser power (75 W) or a high scan speed (300 mm/s) is more energy efficient in Z-direction of the molten pool, giving rise to a deep narrow cross section of the pool. Whereas, a high laser power (150 W) or a low scan speed (50 mm/s) causes a shallow-wide cross section of the molten pool, meaning it is more energy efficient in the Y-direction of the melt. The combination of a laser power of 125 W and a scan speed of 100 mm/s contributes to achieve a sound metallurgical bonding between the neighbor layers and tracks, due to the proper molten pool size (width: 109.3 mu m; length: 120.7 mu m; depth: 67.8 mu m). The SLM experiments on TiC/Inconel 718 powder system are performed to verify the reliability and accuracy of the physical model and, simulation results are proved to be correct. (C) 2016 Elsevier Ltd. All rights reserved.
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