Abstract
The effect of sulfur segregation and hydrogen charging on the grain boundary strength of iron was investigated by a slow strain-rate tensile test at 77 K. The amount of sulfur segregation at grain boundaries was controlled by varying the initial purity of specimens and quenching temperature and was determined by Auger electron spectroscopy after in situ fracture under ultra-high vacuum. The effect of hydrogen on grain boundary strength was examined at various grain boundary sulfur and/or hydrogen contents. The deleterious effects of sulfur and hydrogen on grain boundary strength were found to be independent and additive. The reversible effect of hydrogen is attributed to the reduction in the cohesive strength of grain boundaries due to atomic hydrogen whereas the irreversible effect is attributed to the damage due to molecular hydrogen precipitation.
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