Abstract
Embrittlement of iron of variable impurity levels and identical thermal histories was shown to be dependent on the sulfur enrichment at grain interfaces and the applied cathodic potential. A fracture mode transition from transgranular ductile rupture to brittle intergranular failure was observed as a function of the grain boundary sulfur concentration. This mode change causes a dramatic loss in ductility at a threshold sulfur content of about 13% of monolayer on the fracture surface. A relationship is suggested between the roles S and H play in reducing boundary strength in iron.
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