The Influence of Porosity on Fatigue Crack Initiation in Additively Manufactured Titanium Components.

ABSTRACT: Without post-manufacture HIPing the fatigue life of electron beam melting (EBM) additively manufactured parts is currently dominated by the presence of porosity, exhibiting large amounts of scatter. Here we have shown that the size and location of these defects is crucial in determining the fatigue life of EBM Ti-6Al-4V samples. X-ray computed tomography has been used to characterise all the pores in fatigue samples prior to testing and to follow the initiation and growth of fatigue cracks. This shows that the initiation stage comprises a large fraction of life (>70%). In these samples the initiating defect was often some way from being the largest (merely within the top 35% of large defects). Using various ranking strategies including a range of parameters, we found that when the proximit

SUBMITTER: Tammas-Williams S 

PROVIDER: S-EPMC5544733 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature