Site competition between sulfur and carbon at grain boundaries and their effects on the grain boundary cohesion in iron |
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Authors: | S Suzuki S Tanii K Abiko and H Kimura |
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Affiliation: | (1) The Research Institute for Iron, Steel and Other Metals, Tohoku University, 980 Sendai, Japan;(2) Asahi Glass Company, Tokyo, Japan |
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Abstract: | 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 results show the site compctition on grain boundaries between
the segregation of sulfur and carbon. The segregation energy of sulfur is estimated to be 75 kJ/mol. Impact tests of these
alloys 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 to the binary alloys prevented the intergranular
fracture caused by the grain boundary segregation of sulfur, and decreased the DBTT. Carbon, when segregated to grain boundaries,
drives sulfur away from the boundaries and also increases the grain boundary cohesion. The DBTT values of the iron-sulfur-carbon
alloys are analyzed in terms of the degree of grain boundary segregation of sulfur and carbon. It is shown that sulfur decreases
the grain boundary cohesion of iron more severely than phosphorus if compared at the same degree of grain boundary segregation.
Formerly Graduate Student |
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