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In a recent account of an X-ray microanalysis round robin on Type 316 stainless steel, it was suggested that sample inhomogeneity might have contributed to the observed variability in quantitative analyses. Commercial wrought austenitic stainless steels often contain bands of segregation parallel to the original rolling direction, which may not always be completely removed by so-called "homogenization" heat treatments. Reproducibility in the analyses could perhaps have been improved by scanning the electron beam over sufficiently large an area to average out variations in composition. It would have been interesting to have determined the sample-to sample variation for a single microanalysis system. Analysis of the same specimen by each system in turn would have allowed elimination of the effect of differences between individual samples, though not that of internal variations in composition. An evaluation of microanalysis data for thin foils of Type 308 steel also indicated that the mean results were close to the alloy specification. The range of variation in individual analyses was smaller than in the present case. This may have been attributable to greater sample homogeneity or, since corrections for absorption and fluorescence were not necessary, to avoidance of discrepancies introduced by differences in software.

Additional information

Authors: RICKERBY D G, JRC Ispra Estab. (IT)
Bibliographic Reference: Article: Proceedings of the Royal Microscopical Society, Vol. 23 (1988)
Record Number: 198910191 / Last updated on: 1994-12-01
Original language: en
Available languages: en