Comparative Study of Oxide Speciation in Steel by Inert Gas Fusion Technique

Abstract

The paper presents the application of an improved procedure for oxide speciation in steels by temperature ramped inert gas fusion technique on commercially available instruments. Main steps of analysis, data processing and interpretation of the results are described. The effects of instrumentation and auxiliary materials on the evolution kinetics of oxygen during an analysis are emphasised. The procedure is applied to determine the content of alumina and spinel species in high-carbon steels, attested as reference materials. The results of the gas fusion technique are correlated to those of the chemical analysis and scanning electron microscopy equipped with energy dispersive X-ray detector.

Characterization of Non-metallic Inclusions and Clusters during Production of Low-carbon IF Steel

“…The FGA method can be used as an express tool, which remits to evaluate the contents of various types of oxide inclusions in the metal samples during a short time (10-15 minutes). [27][28][29] In this study, the FGA method was used to examine selected metal samples (Samples 1-4), which are the same as were used for electrolytic extractions. The fractional gas analysis of all samples was carried out on a LECO TC-600 gas analyzer in Baikov Institute of Metallurgy and Material Science (IMET RAS, Moscow, Russia) under the following fixed parameters of heat treatment: preliminary preheating time of sample -2 minutes, preheating temperature of sample -1 150°C, heating range -1 200-2 400°C, heating rate -2°C/s.…”