サイクル熱処理した SUJ 2 鋼における微細組織と機械的性質

概要

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The purpose of this work is to present results on the mechanical properties of SUJ 2 bearing steel improved by a cyclic heat treatment. The structure of thermally cycled steel consists of fine-grained ferrite particles of the size under about 2μm containing fine cementite particles of the size about 0.2μm. Thermally cycled steel was found to be superplastic at 710℃, just below A_1 temperature, at an initial strain rate of 1.67×10^<-4>s^<-1>, i.e. elongation to failure was about 500% and the strain rate sensitivity, m value, was about 0.4. The activation energy of about 180kJ/mol, which is nearly equal to that of grain boundary diffusion of Fe atoms in α-iron, was obtained for this plastic deformation. Furthermore the rolling contact fatigue life test was performed at room temperature under constant load. The fatigue life of SUJ 2 steel thermally cycled was found to be prolonged (about 2.5 times) as compared with that of conventional one.
社団法人日本鉄鋼協会の論文
1989-04-01