Laser solid forming (LSF) was used to fabricate dense and crack-free specimens from solution-strengthened nickel-based superalloy GH3536 in this study. Tensile, and fatigue crack growth (FCG) testing was carried out in both horizontal and vertical build orientations with the condition at 25℃ and 500℃. Three regions can be detected in the specimen: the additive manufacturing zone (AM), the heat affected zone (HAZ) and the substrate. M23C6 and M6C carbides were found in the specimens, only a small amount of hole defects was observed in the samples, and no cracks were found. The tensile test results show that the specimens have obvious anisotropy, and the horizontal specimens displayed higher strength (up to 855.3 MPa ultimate tensile strength at 25℃). It is worth noting that there is no obvious anisotropy in the FCG rates of the specimens in different directions, and only when the ΔK is about 45–60 MPa m1/2, the FCG rates of the vertical specimens are higher. The increase in temperature will significantly reduce the tensile performance and increase the FCG rate of the specimens.

在本研究中，激光固体成形 (LSF) 用于从固溶强化镍基高温合金 GH3536 制造致密且无裂纹的试样。在 25℃ 和 500℃ 的条件下，在水平和垂直构建方向上进行了拉伸和疲劳裂纹扩展 (FCG) 测试。可以在样本中检测到三个区域：增材制造区 (AM)、热影响区 (HAZ) 和基板。试样中发现M23C6和M6C碳化物，试样中仅观察到少量孔缺陷，未发现裂纹。拉伸试验结果表明，试件具有明显的各向异性，水平试件强度较高（可达855.3 MPa 25℃时的极限抗拉强度）。值得注意的是，不同方向试件的FCG率没有明显的各向异性，只有当ΔK为45~60  MPa·m1/2左右时，垂直试件的FCG率更高。温度的升高会显着降低试样的拉伸性能并增加试样的 FCG 率。