中文摘要：

采用最小二乘中线法建立基于成型粉末物性的表面粗糙度计算模型;选用选区激光熔化成型Ti6Al4V单熔道和零件,用表面粗糙度仪检测成型零件的表面粗糙度,光学显微镜观察、检测成型单熔道几何尺寸,分析所建模型理论值与实验值产生误差的原因。实验结果表明：激光重熔区对表面粗糙度计算模型精度影响较大,模型理论值与实验值的平均相对误差为5.7%,误差较小,模型具有实际工程应用价值。成型零件主要由α和β相组成,显微硬度为487.3HV0.3。

英文摘要：

The surface roughness calculation model based on powder properties is established by using the least square mean line method. Selective laser is used to melt molded Ti6Al4V single track and parts. The surface roughness of molded parts is detected by surface profiler and the geometric size of molded single track is observed and measured with optical microscope. The cause of errors between the theoretical and experimental value of the built model is analyzed. The experimental results show that the laser remelting zone has a great impact on the precision of the surface roughness calculation model. The average relative error between the theoretical and experimental value is 5.7 %. The error is small, and the model has a practical engineering application value. The molded parts are mainly composed of αand β phases, and the micro-hardness is 487.3 HV03.