A Behavior of Rolling Contact Fatigue on Retained Austenite in High-Carbon Chromium Bearing Steel

고탄소 크롬 베어링 강에서의 잔류 오스테나이트 변화에 따른 회전접촉 피로거동

In order to study the effect of retained austenite on rolling contact fatigue in high-carbon chromium bearing steel, retained austenite was controlled by only tempering temperature, individually 200, 220 and $240^{\circ}C$. Among various microstructural alteration during rolling contact fatigue test, plate-like carbide most related to the flaking at sub-surface of contact pressure. The plate-like carbides formed during rolling contact fatigue test decrease with increasing tempering temperature, and fatigue life is much more improved. The retained austenite was decreased with the tempering temperature, and that decreased plate-like carbide formation. Therefore fatigue life is much more improved with decreasing retained austenite.