Porosity related defects within metal additive manufactured components has made it challenging to certify their use in fatigue critical applications. In this study, the fatigue behaviour of selective electron beam melted (SEBM) Ti-6Al-4V specimens following hot isostatic pressing (HIP’ing) and finish machining has been investigated. Employing a sufficient material removal depth during machining was shown to significantly improve fatigue performance. This was attributed to be a direct result of removing material rich in lack-of-fusion defects, concentrated in the sub-surface. HIP’ing was shown to enhance fatigue performance to a lesser degree, as the treatment was only effective at reducing gas porosity.

金属添加剂制造的部件中与孔隙率相关的缺陷使认证它们在疲劳关键应用中的使用变得具有挑战性。在这项研究中，研究了选择性电子束熔化（SEBM）Ti-6Al-4V试样在热等静压（HIP'ing）和精加工之后的疲劳行为。在加工过程中采用足够的材料去除深度可显着改善疲劳性能。这归因于去除富含缺乏熔合缺陷的材料（集中在子表面）的直接结果。HIP'ing被证明可以在较小程度上增强疲劳性能，因为该处理仅能有效降低气体孔隙率。