Hydrogen Softening in the Thin Plate of Microcrystalline 316L Stainless Steel

Abstract

The thin‐plate specimen of 316L austenite stainless steel was charged with hydrogen using a cathodic charging technique. Despite the short diffusion distance of hydrogen predicted by the diffusion‐controlled model for a semi‐infinite sheet, the Vickers hardness measurements revealed the full effect of hydrogen in the center of the cross‐sections of thin‐plate specimens as well as in the vicinity of the outer surfaces, which appears to be due to the short‐circuit diffusion mechanism along the grain boundaries. The room‐temperature tensile properties of both undeformed and deformed (20, 40%) samples were examined and compared. Hydrogen softening was apparent in both types of samples. For example, the 40% deformed sample showed an approximately 17 and 7% lower yield and tensile strength, respectively, after H charging at a strain rate of 2 × 10−4 s−1 with a concomitant decrease in ductility compared to that without H.

The Effect of Relative Density on the Mechanical Properties of Hot‐Pressed Cubic Li7La3Zr2O12

“…Because the grains were not equiaxed, individual grain sizes were determined by averaging the length of the major and minor axes . The average grain size was calculated using Eq.…”

Simulating hydrogen in fcc materials with discrete dislocation plasticity

“…These results show hydrogen core force shielding promotes dislocation activity and tends to reduce the flow stress in fcc materials, this has been observed in 316L stainless steel [49] and a nickel based 718 alloy [50,51]. However details relating to microstructure and loading condition will need to be taken into account to simulate experiments.…”