Corrosion behavior of thermohydrogen processed Ti6Al4V

The corrosion behavior of thermohydrogen processed Ti6Al4V was evaluated in simulated human body environment (0.15 M NaCl at 37 \ub0C). Compared with the \u3b2-solution-treated specimen, the grain-refined specimen A exhibited higher hardness and similar corrosion resistance, which implies better performance as a bioimplant material. At 65 and 80 \ub0C, a decrease in corrosion resistance was observed for both A and B specimens that might be ascribed to the increased grain boundaries and \u3b12 precipitates.Peer reviewed: YesNRC publication: Ye

Hydrogen permeation in nanostructured bainitic steel

Hydrogen permeation of nanostructured bainitic steel, produced at two different transformation temperatures, i.e., 473.15 K (200 A degrees C) BS-200 and 623.15 K (350 A degrees C) BS-350, was determined using Devanathan-Stachurski hydrogen permeation cell and compared with that of mild steel. Nanostructured bainitic steel showed lower effective diffusivity of hydrogen as compared to the mild steel. The BS-200 steel, which exhibited higher volume fraction of bainitic ferrite phase, showed lower effective diffusivity than BS-350 steel. The finer microstructural constituents (bainitic ferrite laths and retained austenite films) and higher dislocation density in the bainitic ferrite phase of BS-200 steel can be attributed to its lower effective diffusivity as compared to BS-350 steel and mild steel