Abstract：The capability of the high temperature bearing steel is mostly influenced by the quantity,composition,size of precipitate phase in steel.After isothermal treatment,the high temperature bearing steel could form precipitates of inter-metallic phase and carbides.In order to study the precipitation behavior of precipitates in high temperature bearing steel under different heat treatment conditions,the suitable electrolytic conditions were selected by experiments,the precipitated phase was separated from the matrix by electrolytic extraction.X-ray diffraction (XRD) and scanning electron microscope(SEM) were used to examine their structure and modality.Separation and quantitative component analysis of precipitate phases were carried out by wet chemical analysis and inductively coupled plasma atomic emission spectrometry.The results showed that the electrolytic extraction temperature had a significant effect on the χ phase.The χ phase was insoluble in weak acid containing oxidant,but dissolved in 50%(V/V)H2SO4.With the increase of aging time,the M6C phase content increased significantly,the χ phase content reduced.The M6C phase was granular and the particle size was small,the χ phase was massive and the particle size was big.
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