钴铬合金是常用的口腔修复体材料，采用选择性激光熔融(SLM)技术成形钴铬合金，研究其硬度变化规律对人工义齿在咀嚼过程中的摩擦磨损分析具有重要意义。探讨工艺参数对钴铬合金SLM 成形件硬度的影响规律，并建立维氏硬度预测模型。实验结果表明，SLM 成形过程中，激光功率对钴铬合金试件维氏硬度的影响最显著，扫描速度次之，扫描间距最小。沿建造方向，晶粒呈柱状排列，生长方向一致，晶粒之间有明显的层状堆叠；沿垂直于建造方向，晶粒呈网格状且排列均匀紧密。随着激光能量密度增大，晶粒尺寸逐渐变大，成形件强度和硬度提高，微观纹理致密且孔洞缺陷明显减少。根据实验数据，建立了维氏硬度预测模型并验证了其有效性。

Cobalt chromium alloy is a commonly used dental restorative material, the study of hardness variation trend is very important for the friction and wear analysis of artificial cobalt chromium alloy denture fabricated via selective laser melting (SLM). The influence rule of hardness of SLM formed cobalt chromium alloy from technological parameter is studied and a Vickers hardness model is established. Experimental results indicate that laser power is the mostly significant factor influencing the Vickers hardness of SLM cobalt- chromium alloy specimen, followed by scanning speed, and the minimal is scanning interval. The microstructure shows that along the building direction, grains grow in the shape of columnar with consistent direction and there is an obvious layer stack between the grains. The grain is grid-shaped and arranged uniformly and tightly in the perpendicular direction. As the laser energy density increases, the grain size and hardness of forming parts increase, but both of the microtexture density and hole-defect decrease significantly. Based on the experimental results comparison between the Vickers hardness, the rationality and validity of the Vickers hardness prediction model is verified.