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扫描速度对激光重熔金属陶瓷涂层温度场的影响
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国家自然科学基金项目(51565017);江西省自然科学基金项目(2012BAB206026);江西省教育厅项目(GJJ14424).


Effect of Scanning Speed on the Temperature Field of Laser Remelted Cermet Coating
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    摘要:

    为了确定不同扫描速度对激光重熔金属陶瓷涂层温度场的影响,采用超音速等离子喷涂工艺制备Fe40+Ni60+35WC金属陶瓷涂层;利用ANSYS软件对不同扫描速度下激光重熔过程中的温度场进行动态模拟,分析激光重熔过程温度场加热冷却的规律;通过实验确定不同扫描速度的激光重熔金属陶瓷涂层温度场。结果表明:激光重熔是一个急热骤冷的过程,其光斑中心前侧温度梯度大于后侧温度梯度,因此激光扫描速度会对重熔层温度场的分布特征影响显著;当扫描速度较低时,加热时间、能量的吸收及熔池的深度将增加,导致稀释率上升,而当扫描速度过高时,材料内部的热量不足,使得涂层中难熔相不能充分融化,从而出现未熔颗粒残留并产生气孔,导致孔洞和裂纹的增加,因此应选择合适的扫描速度。通过对重熔层温度的实验检测和分析,验证了温度场模型的可靠性与准确性。

    Abstract:

    In order to determine the influence of different scanning speed on the temperature field of laser remelted cermet coating,and the Fe40+Ni60+35WC cermet coating was prepared by supersonic plasma spraying.The temperature field of laser remelting process was simulated by using ANSYS software under different scanning speed to analyze the heating and cooling law of temperature field in laser remelting process.The temperature field of laser remelting process at different scanning speed was also determined by experiments.The results show that laser remelting is a thermal quenching process,and the temperature gradient of the front center of the spot is greater than that of the backside of the spot,so the laser scanning speed has a significant effect on the temperature field of the remelted layer.When the scanning speed is low,the heating time,the energy absorption and the depth of the molten pool will increase,resulting in a rise in dilution,and when the scanning speed is too high,the internal heat of the material is insufficient,so that the refractory phase in the coating cannot be fully melted,and the remaining undissolved particles and the produced porosity lead to the increase of voids and cracks,so a appropriate scanning speed should be choosen.The reliability and accuracy of the temperature field model were verified by experimental measurement and analysis of the remelting layer temperature.

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赵运才,何文,张佳茹.扫描速度对激光重熔金属陶瓷涂层温度场的影响[J].润滑与密封,2017,42(10):23-30.
. Effect of Scanning Speed on the Temperature Field of Laser Remelted Cermet Coating[J]. Lubrication Engineering,2017,42(10):23-30.

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  • 在线发布日期: 2018-03-21
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