Effect of HIP Treatment on Fatigue Notch Sensitivity of Ti–6Al–4V Alloy Fabricated by Electron Beam Melting

Abstract

The effect of hot isostatic pressing (HIP) treatment on the fatigue notch sensitivity of Ti–6Al–4V alloy fabricated by electron beam melting (EBM) was investigated. The results indicate that the fatigue notch sensitivity of the as-fabricated samples is much lower than that of HIPed samples. The variation of α lamella thickness and the distribution of pore defects have an effect on the fatigue strength in smooth and notched EBM Ti–6Al–4V samples, resulting in the divergence of the as-fabricated and HIPed samples on fatigue notch sensitivity.