Journal
APPLIED SURFACE SCIENCE
Volume 256, Issue 14, Pages 4612-4620Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2010.02.060
Keywords
Laser solid forming; Molten pool spreading; Interfacial tensions; AISI-304 stainless steel
Categories
Funding
- Program for New Century Excellent Talents in University [NCET-06-0879]
- National Natural Science Foundation of China [50971102]
- NPU Foundation for Fundamental Research [NPU-FFR-JC200808]
- State Key Laboratory of Solidification Processing in NWPU [16-TZ-2007, 39-QZ-2009]
- Introducing Talents of Discipline to Universities [08040]
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This paper studies the issue that the molten pool width gradually increases under some conditions during laser solid forming (LSF), which can decrease the shape and dimension accuracy of LSFed component to a large extent. By using the statics analysis method and calculating the interfacial tensions at the solid-liquid-gas triple point of molten pool, the proposed two-dimensional (2D) cross-sectional model of single deposition layer illustrates qualitatively that the deposition width would increase with the increasing pool temperature at a certain powder feeding rate, which we called the pool spread behavior here. Meanwhile, by calculating the maximum equilibrium contact angle for keeping solid-liquid-gas triple point balance, it is found that the molten pool is solidified during non-equilibrium state. Furthermore, in order to control the pool temperature and decrease pool spread amount, the optimal match of pool energy and mass inputs is determined for obtaining an optimum balance between the energy input and deposition efficiencies. (C) 2010 Elsevier B. V. All rights reserved.
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