The effect of hot isostatic pressing on the thermomechanical behavior of electron beam powder-bed fusion SS316L

This study investigates the influence of hot isostatic pressing (HIP) at 100 MPa and temperatures of 960, 1060, and 1160 ℃ on the dynamic mechanical behavior and thermomechanical coupling of 316L stainless steel produced by electron beam powder-bed fusion (EB-PBF). Initially, the density was measured and found to be consistent at about 7.966 g/cm³ across all HIP treatments. Following this, a split Hopkinson pressure bar and a high-speed infrared camera were used to analyze the mechanical response and temperature distribution. These results were compared with those of wire and arc additive manufacturing and bulk (conventionally manufactured) 316L stainless steel. All specimens demonstrated mechanical properties similar to annealed bulk material, with dynamic yield stress around 450–500 MPa and comparable strain hardening. Notably, the EB-PBF material exhibited a higher Taylor–Quinney coefficient (~ 0.7) compared to ~ 0.5 in other cases.