中文摘要：

为了提高激光熔覆修复性能的稳定性，针对GH4169镍基高温合金，从控制稀释率的角度进行了单因素工艺试验。试验结果表明：在一定的参数范围内，稀释率随激光功率的增大而增大，随送粉速率的增大而减小，扫描速度对稀释率的影响不大。为了简化稀释率的研究过程，将激光功率与送粉速率的比值定义为粉末吸热密度，即修复过程中单位质量粉末吸收的激光能量，进一步确立了粉末吸热密度与稀释率的正相关性。运用回归的思想，通过SPSS软件对试验结果进行数据分析，建立了粉末吸热密度与稀释率的关系模型并验证了其准确性，为镍基高温合金激光熔覆修复性能的稳定性研究提供了理论参考与试验支持。

英文摘要：

In order to improve the stability of laser cladding reparation property, several single-factor tests are carried out for GH4169 nickel-based superalloy by controlling the dilution ratio. The result shows that within certain parameter range, the dilution ratio increases with the increase of laser power or the decrease of feeding speed, and the scanning speed may have little influence. In order to simplify the study process of dilution ratio, this paper puts forward the concept of powder-heat-absorption density, which means the laser energy absorbed by a unit mass of powder during the process of laser cladding, establishes the positive correlation between the powder heat absorption and dilution ratio with the combination between laser power and power feeding speed. By using the regression thoughts and with the data analysis about the test results by SPSS software, the relation model between powder heat absorption and dilution ratio is established and the accuracy is verified, which provides the theoretical references and test support about the study of stability of laser cladding reparation property of nickel-based superalloy.