Numerous studies were conducted on the tension–compression fatigue behavior of Inconel 718 (IN718) fabricated with laser powder bed fusion (LPBF). Contrary, only a few fatigue crack growth rate (FCGR) studies are available in the literature. Considering the above, LPBF manufactured IN718 is heat treated in variants including (H) and excluding (A) hot isostatic pressing. FCGR tests are performed at stress ratios R = 0.1 and R = 0.5. Both variants show similar FCGR and fracture modes at both stress ratios, despite a significant difference in ductility. Furthermore, A and H show similar FCGR at R = 0.1 and better performance at R = 0.5 compared to wrought IN718.

对采用激光粉末床熔合 (LPBF) 制造的 Inconel 718 (IN718) 的拉伸-压缩疲劳行为进行了大量研究。相反，文献中只有少数疲劳裂纹扩展速率 (FCGR) 研究可用。考虑到上述情况，LPBF 制造的 IN718 在变体中进行热处理，包括 (H) 和不包括 (A) 热等静压。FCGR 测试在应力比 R = 0.1 和 R = 0.5 下进行。尽管延展性存在显着差异，但两种变体在两种应力比下都显示出相似的 FCGR 和断裂模式。此外，与锻制 IN718 相比，A 和 H 在 R = 0.1 时表现出相似的 FCGR，在 R = 0.5 时表现出更好的性能。