Abstract
Techniques for quantitative estimation of various secodary phases present in austenitic stainless steels were developed using electrochemical and chemical separation procedures. The secondary phases like delta-ferrite, sigma-phase and M23C6 carbide were obtained in pure forms by the electrochemical technique and their anodic polarization behaviours were studied in a sulphuric acid-ammonium thiocyanate medium. The dissolution behaviour of the secondary phases was studied in bromine-methanol solution and the procedures for the separation of delta ferrite-carbide and sigma-carbide mixtures and the quantitative estimation of delta-ferrite, sigma- and M23C6 carbide-phases were standardized.
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