Abstract
Relation between the amount of P-segregation and grain boundary crystallography in an FeNiCr alloy was studied. A grain boundary etching method was utilized for analyzing P-segregation, and the crystallography of grain boundaries was characterized by making channelling pattern and trace analysis. Macroscopic geometric characteristics of grain boundaries which were found to be effective in suppressing the amount of P-segregation are (1) low-angle disorientation (2) σ3 orientation relation, (3) \\ ̃ gs3 (quasi-twin) orientation relation (4) boundary orientation close to the orientation of the coherent twin boundary,(5) boundary plane having low indices, and (6) boundary straightness. It was suggested that an essential geometric factor on the atomic scale which controls the amount of P-segregation in high-angle boundaries is their coherency or free volume.
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