Grain boundary segregation in iron-sulfur-carbon alloys containing up to 100 wt ppm sulfur and up to 90 wt ppm carbon has been investigated with Auger electron spectroscopy (AES). The segregation energy of sulfur is estimated to be 75 kJ/mol. Impact tests were carried out. Iron-sulfur alloys with less than 20 wt ppm carbon fractured by the intergranular mode with high ductile-brittle transition temperatures (DBTT's). Addition of up to 90 wt ppm carbon prevented intergranular fracture and decreased the DBTT. Carbon, when segregated to grain boundaries, drives sulfur away from the boundaries and increases the grain boundary cohesion.
|Number of pages||7|
|Journal||Metallurgical transactions. A, Physical metallurgy and materials science|
|Publication status||Published - 1987 Jun 1|
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