軸受鋼のせん断型疲労き裂進展下限界特性に及ぼす水素の影響

抄録

In rolling element bearing, premature delamination failure, called white structure flaking (WSF) or white etching crack (WEC), often occurs. This premature flaking decreases the durability and reliability of bearing significantly. It is known that a flaking failure is attributed to shear-mode fatigue crack growth under heavy compression. In addition, some previous studies point out that WSF is related to hydrogen that is derived from decomposition of lubricant and penetrates into the bearing steel in operation.

In this study, in order to establish the safety of bearing, the effect of hydrogen on shear-mode fatigue threshold was investigated using a continuous hydrogen charging method.