Influence of HIP on the mechanical properties of selected metallic materials

Čegan Tomáš - VŠB Technical University of Ostrava (Czech Republic)

This study investigates the effect of hot isostatic pressing (HIP) on reducing internal porosity, driving microstructural evolution, and enhancing the mechanical properties of metallic materials. It focuses on DIN 1.7765 steel produced using metal injection molding (MIM) technology and 316L stainless steel and Ti6Al4V alloy fabricated through laser beam powder bed fusion (LB-PBF). The findings reveal that optimized HIP parameters effectively reduce internal porosity, which can initially reach several percent, to near-zero levels. This substantial reduction in porosity, accompanied by microstructural changes, results in significant improvements in ductility. Additionally, the elimination of internal defects decreases the risk of material failure, underscoring the critical role of HIP in enhancing the structural integrity and mechanical performance of materials processed through MIM and LB-PBF techniques.