摘要
根据激光熔覆的温度场理论,利用ANSYS有限元模拟软件,模拟了多道熔覆镍基合金上表面的温度场,重点研究了激光道次间的停顿时间对激光熔覆镍基合金温度场的影响。模拟在不同停顿时间条件下的激光熔覆镍基合金的温度场,得到每一道初始位置上表面的最高温度值,以及激光基底和熔覆层交界处不同位置的温度和温度梯度值。模拟结果表明,在多道熔覆的过程中,道次间停顿1.5s对比无停顿和停顿1s时熔覆效果好,并做了相应的实验。实验结果表明,道次间停顿1.5s时,熔池深度变小,熔覆的表面平整度较好,熔覆质量较高。数值模拟和实验一致性较好,模拟和实验结果都表明,停顿时间对多道熔覆镍基合金温度场的影响较大,研究成果对激光多道熔覆镍基合金选择合适的工艺参数、降低温度梯度、提高多道次激光熔覆质量具有重要意义。
According to the temperature field theory of laser cladding and using ANSYS finite element simulation software,the temperature field on the surface of multi-channel cladding nickel-based alloy was simulated.The effect of the pause time between laser passes on the temperature field of laser cladding nickel-based alloy was studied.The temperature field of laser cladding nickel-base alloy under different pause time was simulated,and the maximum temperature value of the surface at each initial position,and the temperature gradient at different positions at the interface of laser substrate and cladding layer were obtained.The simulation results show that the effect of laser cladding with 1.5 spause between passes is better than that without pause and 1 spause during the multi-pass cladding process,and the phase was made.Corresponding experiments have been done.The experimental results show that the depth of molten pool decreases,the surface smoothness of cladding is better and the quality of cladding is higher when the pass stops for 1.5 s.The results of numerical simulation and experiment are in good agreement.Both simulation and experiment show that the pause time has a great influence on the temperature field of multi-channel laser cladding nickel-based alloy.The research results of great significance to the selection of appropriate process parameters,the reduction of temperature gradient and the improvement of the quality of multi-channel laser cladding nickel-based alloy.
作者
陈文志
周红
徐立君
CHEN Wenzhi;ZHOU Hong;XU Lijun(College of Science,Changchun University of Science and Technology,Changchun 130022,China)
出处
《光学技术》
CAS
CSCD
北大核心
2020年第1期96-101,共6页
Optical Technique
基金
国家自然科学基金青年项目(61007006).
关键词
激光熔覆
多道次
停顿时间
温度梯度
laser cladding
multi-pass
pause time
temperature gradient
