上部及び下部ベイナイト球状黒鉛鋳鉄のころがり疲労

概要

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Spheroidal graphite cast iron containing 3.61%C, 2.21%Si, 0.4%Mn and 0.045%Mg were austempered at 375°C and 235°C for 2hr. The rolling contact fatigue strength of austempered cast iron was investigated by using a Nishihara-type rolling contact testing machine under a light oil lubricant, and the effects of bainite structures and relative sliding ratio on the rolling contact fatigue limit (F*) were studied. F* of lower bainitic spheroidal graphite cast iron was larger than that of upper bainitic iron, though the former worn and the surface rougher during rolling contact test. F* of the both lower and upper bainitic irons became smaller as the relative sliding ratio increased.
日本鋳造工学会の論文