Analysis of temperature field of laser cladding Ni-based alloy
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1.
Department of Mechanical and Electrical Engineering, Lu'an Vocation Technology College, Lu'an 237158, China;
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2.
Department of Mechanical Engineering, Anhui Vocational and Technical College of Defense Technology, Lu'an 237011, China
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Received Date:
2012-11-05
Accepted Date:
2012-12-31
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Abstract
In order to analyze the rules of temperature field and molten pool crystalline diversification during the preset powder Ni-based alloy cladding process, a 3-D model of laser cladding was made with finite element method. Taking consideration of the impact of temperature changes on the thermal physical parameters and the effects of heat convection and radiation heat, temperature field and solidification and crystallization of laser cladding process were analyzed and verified by SYSWELD software. The results show that the highest temperature is at the spot center, the isothermal line is almost elliptical and the temperature declines gradually along the radius of the spot center. Thermal cycle peak temperature at a certain point on the coating reduced significantly as the heat source was away. The temperature increased from the room temperature at the first pass to 730℃ at the final pass. Shape factor is reduced from 1.9109℃smm-2 of bonding surface to 0.7109℃smm-2 of cladding surface. At the same time, secondary dendrite spacing is the biggest at the bonding surface and the smallest at the cladding surface. The calculation results are perfectly matched with metallographic microstructure and solidification and crystallization theory. The results provide theoretical guidance for the optimization of laser cladding
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