鉄鋼の分光分析における炭素含有量の影響

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In spectrochemical analysis of steels, the effect of coexisting elements, carbon in particular, has become a subject of discussion. R. Bartel and A. Goldblatt reported that the elimination of metallurgical effect of carbon content by critically damped discharge was due to the formation of graphite deposit on the sample electrode.<BR>By using Applied Research Laboratories 1.5 m Industrial Research Quantometer, low alloy steel, spring steel and cast iron of known chemical composition are excited with low voltage spark discharge (C=12μF, L =50μH, R=5.Ω, V= 940V) and high voltage spark discharges (C=0. 007μF, L=0, R =residual, V=15 kV and C=0.007μF, L=410μH, R=residual, V=15 kV). Graphite, copper and magnesium are used as the counter electrode to examine its effect. Working curves for silicon, manganese, copper, nickel and chromium are obtained by using low alloy steel, spring steel and cast iron, and are examined whether they fall on a single curve.<BR>It is found that the results of R. Bartel and A. Goldblatt are not always correct; working curves for chromium in low alloy steel, spring steel and cast iron fall on a single curve under all excitation conditions.
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