## 1 Introduction  
As one of the more mature additive manufacturing technologies in recent years, the selective laser melting (SLM) technology has been increasingly applied in the field of industrial manufacturing. Complex metal parts can be directly manufactured by the SLM technology based on CAD data by selectively melting consecutive metal powder layers [1, 2]. The main advantage of the SLM technology is the ability to manufacture almost completely dense metal parts (even over 99.9%), without post-processing such as infiltration, sintering, or HIP. Additionally, the SLM technology has unique advantages in the forming and manufacturing of complex geometric structures. Consequently, it has significant advantages and development prospects in fields such as the aerospace, automotive, and medical industries [3, 4]. As one of the metal materials formed by the SLM technology, nickel-based high-temperature alloys have been widely used in the aerospace field for components. Among nickel-based alloys, Inconel 625 and Inconel 718 have superior thermal-mechanical properties compared to other nickel-based alloys [5]. Inconel 718 is a precipitation hardening superalloy with Nb and Mo as the main strengthening elements, and its three main elements are Ni, Cr, and Fe [6, 7]. It has good comprehensive mechanical properties at high temperatures (approximately 700 \({}^{\circ}\)C) [8, 9]. Therefore, it has been widely used in the manufacturing of high-temperature components such as turbine blades, rocket engines, etc. [10] in the industrial manufacturing field. Research has shown that Inconel 718 alloy parts formed by SLM have a dense and fine structure, surpassing those of Inconel 718 alloy materials processed by traditional processes in multiple aspects [11]. During the process of forming Inconel 718 alloy material by SLM, the quality and performance of the formed parts can be significantly impacted by various process parameters such as scanning path, layer thickness, laser power, etc. Many scholars have studied the forming of Inconel 718 based on these process parameters. [PERSON] et al. [12] investigated the reduction in residual stress and the correlation between microstructure and mechanical properties of Inconel 718 alloy during the SLM process through low-energy-density rescan heating. [PERSON] et al. [13] studied the effect of the laser scanning speed on the density of Inconel 718 alloy formed by SLM. [PERSON] et al. [14] studied the effect of laser scanning spacing on the density, phase composition, grain morphology, and orientation relationship of Inconel 718 alloy formed by SLM. [PERSON] et al. [15] studied the effect of scanning measurement on the forming quality of Inconel 718 samples formed by SLM. [PERSON] et al. [16] studied the effect of energy density on the upper surface roughness and density of SLM-formed specimens [17]. The microstructure and mechanical properties of SLM-formed parts can be directly impacted by laser power, which is an important process parameter for measuring laser energy [18]. Currently, there is relatively little research on the effect of laser power on the quality of Inconel 718 alloy formed by SLM. Many scholars have studied the shaping of laser power in other related materials. For examples, the density and hardness of SLMed GH4169 alloy increased with the increase in laser power [19]. Two leading causes of pore formation in Inconel 738 LC were determined as lack of fusion and keyholes, which were attributed to different energy input densities [20]. IN 625 is sensitive to the processing parameters, and excessively high and low scan speeds may result in lack of fusion and unstable melt pools, respectively, and then cause the formation of large pores. Therefore, choosing the suitable values for laser power and scan speed can lead to samples with relative densities exceeding 99.8% [21]. The hardness and density of SLMed Ti-6 Al-4V are highly related to the formation of a melting pool and porosity during the process [22].