应用激光, 2017, 37 (1): 51, 网络出版: 2017-06-27   

基体热累积对铝合金激光熔化沉积单道形貌的影响研究

Research on the Influence of Heat Accumulation of Substrate on the Morphology of Single Tracks of the Aluminum Alloy Laser Melting Deposition
作者单位
1 南京航空航天大学机电学院, 江苏 南京 210016
2 南京先进激光技术研究院, 江苏 南京 210038
摘要
基于激光熔化沉积技术, 在6061铝合金表面进行了激光熔化沉积AlSi10Mg 铝合金试验, 并引入基体热累积因子XR(红外测温仪监测的温度TR与采集距离R的比值)来研究基体热累积对单道沉积层形貌的影响。结果表明, 随着沉积的不断推进, XR逐渐增大并最终趋于稳定, 即基体热累积量不断增加, 且最终与环境的换热达到动态平衡。此外, 随着XR的增加, 沉积层截面形貌呈扁平化趋势, 具体表现为沉积层宽度和熔池深度逐渐变大, 而沉积层高度变化不明显。研究还表明, 在一定的工艺范围内, 接触角随着XR的增大而减小, 而稀释率随着XR的增大而增大, 并且接触角和稀释率都与XR呈线性相关。
Abstract
In order to study the influence of heat accumulation of the substrate on morphology of single tracks based on laser melting deposition, the experiments with laser melting and depositing AlSi10Mg powder on 6061 aluminum alloy substrate were carried out. The ratio of TRand R was defined as heat accumulation factor, XR, to represent the variation of heat accumulation of substrate qualitatively, and TR was the temperature located in the trailing edge of melting pool with the distance R from the center of laser spot, detected by utilizing the infrared thermometer. The results showed that the XR increased gradually and became stable eventually with the advancement of deposition progress, indicating heat accumulation of substrate increased and reached dynamic equilibrium in heat conduction between substrate and environment. With the increasing of XR, the cross-section shape of deposited layer had flat trend, the width and depth of deposited layer increased gradually, the height of deposited layer showed no significant changes conversely. Moreover, with the increasing of XR, the contact angle increased and dilution ratio decreased, and contact angle and dilution ratio had linear correlation with XRin certain parameter range.

冯秋娜, 田宗军, 梁绘昕, 高雪松, 肖猛. 基体热累积对铝合金激光熔化沉积单道形貌的影响研究[J]. 应用激光, 2017, 37(1): 51. Feng Qiuna, Tian Zongjun, Liang Huixin, Gao Xuesong, Xiao Meng. Research on the Influence of Heat Accumulation of Substrate on the Morphology of Single Tracks of the Aluminum Alloy Laser Melting Deposition[J]. APPLIED LASER, 2017, 37(1): 51.

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