A study of intergranular fracture in iron using auger spectroscopy
Low temperature impact tests on three fairly pure irons have shown that the propensity for intergranular fracture is largely independent of prior heat treatment. Furthermore, the effects of carbon and oxygen contents and carbon : oxygen ratio were found to be opposite to those previously reported. Examination of fracture surfaces by Auger Spectroscopy showed that sulfur was strongly segregated to grain boundaries but showed no evidence of oxygen segregation. The fracture behavior of specimens previously tested in creep or high temperature fatigue differed from that of untested specimens in that fracture was predominantly by transgranular cleavage.
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