1987 Volume 73 Issue 10 Pages 1419-1424
In the emission spectrometric analysis of steels, the influence of surface structure and microstructure on an analytical result and its prevention were investigated. The followings were obtained.
(1) The analytical precision was markedly influenced by the presence of surface oxidized layer but not by the surface roughness.
(2) Microstructural effect on analytical results was found to be due to the unusual emission caused by preferential discharge into pearlite. This effect was remarkable in the analysis of carbon.
(3) The preferential discharge was improved by the rapid formation of electrical discharge hardening layer, which was achieved by the prolonged preburn time or the discharge with high energy spark.
