采用激光增材制造技术制备了AF1410 超高强度钢厚板试样，采取均匀化热处理和AF1410 钢传统热处理工艺相结合的热处理制度。分析了其沉积态和热处理后的微观组织、硬度及室温拉伸性能变化。结果表明：激光增材制造的沉积态AF1410 超高强度钢试样组织表现出定向凝固的特征，硬度约为360 HV；经热处理后，试样中定向胞状凝固组织消失，组织细化，获得细小的回火马氏体组织，硬度达到510 HV 左右，室温屈服强度和抗拉强度分别达到1490 MPa和1610 MPa，延伸率和断面收缩率分别为12.8%和70%。

AF1410 ultra-high strength steel plate sample is fabricated using the laser additive manufacturing (LAM) technique and homogenization treatment combined with the traditional heat treatment of AF1410 is conducted as the heat treatment. Microstructures, hardness and tensile properties of the steel are investigated. Results show that the microstructures of as-deposited AF1410 exhibit some characteristics of directional solidification with a hardness of about 360 HV. After the heat treatment, the directional solidification microstructure disappears while a refined microstructure and tempered martensite are obtained with hardness of about 510 HV. Meanwhile, yield strength and tensile strength at room temperature of the heat treated steel reach to 1490 MPa and 1610 MPa, respectively, with the elongation of 12.8% and the reduction of area of 70%.