| 镍基合金激光熔覆数值模拟及凝固参数预测 |
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| 引用本文： | 程延海,蒋艺超,杨金勇,韩正铜,程志红.镍基合金激光熔覆数值模拟及凝固参数预测[J].工程热物理学报,2022,43(2):494-499. |
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| 作者姓名： | 程延海 蒋艺超 杨金勇 韩正铜 程志红 |
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| 作者单位： | 中国矿业大学机电工程学院,徐州221116 |
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| 基金项目： | 国家自然科学基金面上项目资助(No.51676205)。 |
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| 摘 要： | 本文采用有限体积法对激光熔覆过程的温度场分布和熔体流动进行了数值模拟。基于CALPHAD相图法计算了基体和粉末的热物理性质,采用三维热源精确预测了凝固过程和温度分布,研究了Marangoni对流对熔池尺寸的影响。在熔池凝固过程中模拟所得出的温度梯度和凝固速度,预测了熔覆层凝固组织的演变趋势,相应的显微组织与实验结果吻合较好。
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| 关 键 词： | 激光熔覆 熔池尺寸 显微组织 Marangoni效应 |
Heat Transfer Simulation and Solidification Parameter Prediction of Nickel-based Alloy Laser Cladding |
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| CHENG Yan-Hai,JIANG Yi-Chao,YANG Jin-Yong,HAN Zheng-Tong,CHENG Zhi-Hong.Heat Transfer Simulation and Solidification Parameter Prediction of Nickel-based Alloy Laser Cladding[J].Journal of Engineering Thermophysics,2022,43(2):494-499. |
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| Authors: | CHENG Yan-Hai JIANG Yi-Chao YANG Jin-Yong HAN Zheng-Tong CHENG Zhi-Hong |
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| Institution: | (School of Mechanical Engineering,China University of Mining and Technology,Xuzhou 221116,China) |
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| Abstract: | In this paper,the finite volume method(FVM)is used to simulate the temperature field distribution and melt flow in the laser cladding process.The thermophysical properties of matrix and powder were calculated by CALPHAD phase diagram method.A 3-dimensional heat source is used to accurately predict the solidification process and temperature distribution,the effect of Marangoni convection on the size of the molten pool is studied.During the solidification process of the molten pool,the temperature gradient and solidification speed were simulated to predict the morphology and size of the solidified structure of the cladding layer.The corresponding microstructure is in good agreement with the experimental results. |
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| Keywords: | laser cladding molten pool size microstructure Marangoni effect |
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