Abstract
Grain boundary microchemical characterization, by Auger electron spectroscopy, has been performed in the martensitic steel EM-10 doped with relevant spallation elements that are expected to be produced at the spallation target window in future Accelerator Driven Systems (ADS). A heat treatment of step-cooling was performed in all doped materials to accelerate impurity segregation. The results indicate that step-cooling promotes chromium and molybdenum enrichment at the grain boundaries in the four materials studied. Step-cooling promotes phosphorus segregation to grain boundaries in the reference material, in the material doped with titanium, and in the material doped with titanium, phosphorus and sulphur. Step-cooling also promotes titanium enrichment in the materials doped with this element. A relation among chromium, molybdenum and phosphorus has been observed in the alloy doped with titanium, phosphorus and sulphur suggesting co-segregation of these elements to grain boundaries or segregation of phosphorus at the interface of the matrix and the carbides rich in chromium and molybdenum.
Published Version
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