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Synopsis: The dark stained net-work structure along grain boundaries was shown in the micro-stucture of hardened high C low Cr ball bearing steels when etched with sodium picrate. This phenomenon was rather faint with the heating temperature at heardening was low but it became distinct and wider extending within the grains as the heating temperature increased. This structure was not affected by cooling velocity. This phenomenon was appeared in a case of tbe spheroidized structure was hardened, howerver, in a case of sorbitic structure the entire grain was darkened which makes it unrevealed, and it is resolved under higher magnification of a microscope as a acicular structure. This structure was not troostite nor bainite which appeared in the isothermal transformation, but it was martensite and assumed that due to heterogeneity of the elements such as carbon. It seemed that this structure was the resultant of higher carbon content along the boundaries than within the grains which caused by the preferential dissolving of smaller cementite particles along grain boundaries in the spheroidized structure as the austenitizing temperature increased, and it had marked influence on the mechanical strength of ball bearing steels. The cause of the heterogeneity in the austenitizing was suggested to be the effect of chromium.

A GRAIN BOUNDARY PHENOMENON IN THE HARDENED STRUCTURE OF BALL BEARING STEELS.