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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X_R(红外测温仪监测的温度T_R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,X_R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X_R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X_R的增大而减小,而稀释率随着X_R的增大而增大,并且接触角和稀释率都与X_R呈线性相关。
Based on the laser melting deposition technology, the AlSi10Mg laser alloy was tested on the surface of 6061 aluminum alloy, and the matrix thermal accumulation factor X_R (the ratio of the temperature T_R monitored by the infrared thermometer to the collection distance R) Influence of single channel sedimentary topography. The results show that X_R gradually increases and eventually stabilizes with the continuous deposition, that is, the heat accumulation in the matrix increases continuously, and finally the heat exchange with the environment reaches a dynamic equilibrium. In addition, with the increase of X_R, the cross-sectional morphology of the sedimentary layer shows a flattening trend, which shows that the width of the sedimentary layer and the depth of the molten pool gradually increase, while the height of the sedimentary layer does not change obviously. The study also shows that the contact angle decreases with the increase of X_R within a certain range of process, and the dilution rate increases with the increase of X_R, and the contact angle and dilution rate are linearly related to X_R.