Study on rolling wear and rolling contact fatigue behavior of pearlite/bainite rail steels at the low temperature of-35 ℃
The rail in the high altitude and high latitude regions faces the low temperature service envir-onment.The rolling wear and damage behaviors under low temperature are the significant factors influ-encing the rail service safety.The wear and rolling contact fatigue(RCF)damage laws of pearlite rail steels(hypoeutectoid and eutectoid)and bainite rail steel were explored at the low temperature of-35℃ using wheel/rail rolling contact simulation experiments.The results showed that the hardening degree of bainite rail was lower at-35℃,and the wear degree was higher than those of pearlite rails.The wear degree of hypoeutectoid rail steel was lower than that of eutectoid rail steel.Different RCF damage levels occurred on the explored three kinds of rail steels.Cracks mainly propagated with small angles(＜10°).There was a competitive relationship between the wear and RCF.The RCF damage of hypo-eutectoid rail steel with less wear was serious,followed by eutectoid rail,and the RCF damage of bain-ite rail steel with the most severe wear was the mildest.
pearlite rail steelbainite rail steellow temperature environmentwearRCF
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