A new approach is presented in this paper to link the integrated area of the spectral curve with the molten pool temperature, the grain size and molten pool plasma during laser additive manufacturing. A fiber laser was used to deposit the CoCrMo powder on the Q235 steel substrate. The spectra generated during the additive manufacturing process were collected with an optical spectrometer attached to the laser head. According to the thermal radiation theory and the rapid solidification theory, spectral information was applied to calculate the molten pool temperature and the grain size. The relationship between the molten pool temperature and the integrated area of the spectral curve, as well as the relationship between the grain size and the integrated area of the spectral curve was established, respectively. Meanwhile, the electron temperature and electron density of the molten pool plasma were calculated from two different Cr I spectral lines at 403.292 and 434.429 nm wavelength. The results show that the molten pool temperature and the grain size are closely related to the integrated area of the spectral curve. Furthermore, the electron temperature and electron density also increase with the integrated area of the spectral curve.

本文提出了一种新方法，可将光谱曲线的积分面积与激光增材制造过程中的熔池温度，晶粒尺寸和熔池等离子体联系起来。使用光纤激光器将CoCrMo粉末沉积在Q235钢基底上。在增材制造过程中生成的光谱是通过附在激光头上的光谱仪收集的。根据热辐射理论和快速凝固理论，利用光谱信息计算熔池温度和晶粒度。建立了熔池温度与光谱曲线积分面积之间的关系，以及晶粒尺寸与光谱曲线积分面积之间的关系。同时，熔池等离子体的电子温度和电子密度是根据403.292和434.429 nm波长处的两条不同的Cr I谱线计算的。结果表明，熔池温度和晶粒尺寸与光谱曲线的积分面积密切相关。此外，电子温度和电子密度也随着光谱曲线的积分面积而增加。