| 摘要 |
PROBLEM TO BE SOLVED: To provide an evaluation method of macrosegregation due to emission spectral analysis capable of rapidly grasping segregation state, while ensuring poor analytical precision by rationalizing the size of an analytic lattice point or the number of analyzing points. SOLUTION: In the evaluation method of macrosegregation, a cast piece sample wherein a cut surface passing through the center part of a cast piece is cut and moved so that an electrode, which generates spark discharge, successively corresponds at least three unidimensional or two-dimensional analyzing lattice points on the cut surface of the cast piece sample. At the respective analytic lattice points, spark discharge, comprising a plurality of pulses accompanying preparatory, is produced through the window part of a mask, to which a window with a diameter 1-5 mm of an inscribed circle is provided and emission spectral analysis using the spark discharge as the light source is performed. Macrosegregation is evaluated quantitatively by quantitatively analyzing the concentrations of a trace amount components in steel at each of the analytic lattice points. COPYRIGHT: (C)2007,JPO&INPIT
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