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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    Special 2    September 2009

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Temperature and stress fields of multi-track laser cladding
ZHAO Hong-yun (赵洪运), ZHANG Hong-tao(张洪涛), XU Chun-hua(徐春华), YANG Xian-qun(杨贤群)

School of Materials Science and Engineering, Harbin Institute of Technology at Weihai,
Weihai 264209, China

Abstract:Based on genetic algorithm and neural network algorithm, the finite element analyses on the temperature fields and stress fields of multi-track laser cladding were carried out by using the ANSYS software. The results show that, in the multi-track cladding process, the temperature field ellipse leans to the cladding formed, and the front cladding has preheating function on the following cladding. During cladding, the longitudinal stress is the largest, the lateral stress is the second, and the thickness direction stress is the smallest. The center of the cladding is in the tensile stress condition. The longitudinal tensile stress is higher than the lateral or thickness direction stress by several times, and the tensile stress achieves the maximum at the area of joint between the cladding and substrate. Therefore, it is inferred that transversal crack is the most main crack form in multi-track laser cladding. Moreover, the joint between cladding and substrate is the crack sensitive area, and this is consistent with the actual experiments.

 

Key words: finite element analysis; multi-track cladding; stress field; transversal crack

ISSN 1672-7029
CN 43-1423/U

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