高温・高速回転荷重下における軸受鋼のころがり疲れ挙動

概要

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Rolling contact fatigue behavior in SUJ-2 and AISI M50 steels was investigated using a thrust type testing under the conditions ; shaft speed of 8760 rpm, maximum Hertz stress of 476 kgf/mm^2, and temperatures of 50℃ and 150℃. The Weibull distribution of fatigue life at 50℃ presented approximately linear line, while the complex Weibull distribution was obtained at 150℃ in both SUJ-2 and M50 specimens. The rolling fatigue life of M50 was much longer than that of SUJ-2 at both 50℃ and 150℃. The mean fatigue life of SUJ-2 at 150℃ was shorter than that at 50℃, whereas the mean life of M50 at 150℃ represented to a greater extension compared with the life at 50℃. These results were explained in terms of no hardness decrement on the track in M50 during high temperature rolling contact. Scanning electron microscopy of a flaking on the rolling surface and of a cross section revealed that the flaking in both SUJ-2 and M50 was initiated at plate-like carbides developed during cyclic stressing in rolling contact.
社団法人日本鉄鋼協会の論文
1986-07-01